# Boeing Alert Service Bulletin 747-25A3581: Boeing - Service Bulletin

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- Pages: 55
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### Page 1

Commercial 
Airplanes
747
Service Bulletin
ALERT
Number: 747-25A3581
Original Issue: September 23, 2010
Revision 1: June 30, 2011
ATA System: 2500
SUBJECT: EQUIPMENT/FURNISHINGS - Cargo and Accessory Compartments - M826 Cardfile
Drip Shield Change
Export of this technology is controlled under the United States Export Administration Regulations (EAR) (15
CFR 730-774). An export license may be required before it is used for development, production or use by foreign
persons from specific countries. The controller of this data has the individual responsibility to abide by all export
laws.
9E991ECCN:
BOEING PROPRIETARY, CONFIDENTIAL, AND/OR TRADE SECRET
Copyright © 2010 The Boeing Company
Unpublished Work - All Rights Reserved
Boeing claims copyright in each page of this document only to the extent that the page contains copyrightable
subject matter. Boeing also claims copyright in this document as a compilation and/or collective work.
This document includes proprietary information owned by The Boeing Company and/or one or more third parties.
Treatment of the document and the information it contains is governed by contract with Boeing. For more
information, contact The Boeing Company, P.O. Box 3707, Seattle, Washington 98124.
Boeing, the Boeing signature, the Boeing symbol, 707, 717, 727, 737, 747, 757, 767, 777, 787, Dreamliner,
BBJ, DC-8, DC-9, DC-10, KC-10, KDC-10, MD-10, MD-11, MD-80, MD-88, MD-90, P-8A, Poseidon and the
Boeing livery are all trademarks owned by The Boeing Company; and no trademark license is granted in
connection with this document unless provided in writing by Boeing.
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Table of Contents
Revision Transmittal Sheet ............................................ 5
Summary ...................................................... 7
1. PLANNING INFORMATION ........................................ 1 1
A. Effectivity ............................................... 1 1
1. Airplanes ............................................ 1 1
2. Spares Affected ........................................ 1 2
B. Concurrent Requirements ...................................... 1 2
C. Reason ................................................ 1 3
D. Description .............................................. 1 3
E. Compliance .............................................. 1 4
F. Approval ............................................... 1 4
G. Manpower .............................................. 1 4
H. Weight and Balance Changes .................................... 1 5
I. Electrical Load Data ......................................... 1 5
J. References .............................................. 1 5
1. Existing Data .......................................... 1 5
2. Data supplied with this Service Bulletin ............................ 1 6
3. Installation Drawings Used in the Preparation of this Service Bulletin ............ 1 6
K. Publications Affected ........................................ 1 6
L. Interchangeability and Intermixability of Parts ........................... 1 6
2. MATERIAL INFORMATION ........................................ 1 7
A. Material - Price and Availability ................................... 1 7
B. Industry Support Information .................................... 1 7
C. Parts Necessary For Each Airplane ................................. 1 7
1. Kits/Parts ............................................ 1 7
2. Parts and Materials Supplied by the Operator ........................ 1 9
3. Parts Modified and Reidentified ................................ 2 0
4. Parts Removed and Not Replaced .............................. 2 0
D. Parts Necessary to Change Spares ................................. 2 0
E. Special Tooling - Price and Availability ............................... 2 0
F. Special Tooling Necessary to do this Service Bulletin ....................... 2 0
3. ACCOMPLISHMENT INSTRUCTIONS .................................. 2 1
A. GENERAL INFORMATION ..................................... 2 1
B. WORK INSTRUCTIONS ....................................... 2 2
FIGURE 1: ELECTRONICS EQUIPMENT CENTER - REMOVAL OF EXISTING DRIP SHIELD .... 2 3
FIGURE 2: ELECTRONICS EQUIPMENT CENTER - LOOSEN AFFECTED WIRE BUNDLES .... 2 8
FIGURE 3: ELECTRONICS EQUIPMENT CENTER - PROVISIONS FOR WIRE BUNDLE RELOCATION
.................................................. 3 2
FIGURE 4: ELECTRONICS EQUIPMENT CENTER - RELOCATE WIRE BUNDLES ROUTING . . . 37
FIGURE 5: ELECTRONICS EQUIPMENT CENTER - INSTALLATION OF ALL SUPPORT BRACKETS AND
NEW DRIP SHIELD ASSEMBLY ............................... 4 1
FIGURE 6: ELECTRONICS EQUIPMENT CENTER - INSTALLATION OF DRIP SHIELD DEFLECTORS
.................................................. 4 9
FIGURE 7: INSULATION BLANKET REPLACEMENT .......................... 5 3
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Commercial 
Airplanes
747
Service Bulletin
ALERT
Revision Transmittal SheetNumber: 747-25A3581Original Issue: September 23, 2010
Revision 1: June 30, 2011
ATA System: 2500
SUBJECT: EQUIPMENT/FURNISHINGS - Cargo and Accessory Compartments - M826 Cardfile
Drip Shield Change
This revision includes all pages of the service bulletin.
COMPLIANCE INFORMATION RELATED TO THIS REVISION
More work is necessary on the airplane(s) changed in accordance with the original issue of this service bulletin.
New deflector shield installation at STA 340 and insulation blanket replacement have been added. No airplane
has incorporated the original issue of this service bulletin.
REASON FOR REVISION
This revision is sent to make changes to the service bulletin to correct an interference issue found during parts
mock-up for the 747-8.
These sections were changed:
1. Paragraph 2.C.1., Parts Necessary For Each Airplane, 015U1884-1 Top Kit added Deflector Shield, fasteners
and insulation blanket.
2. Figure 1 - Added instructions to plug the unused holes at STA 340 and STA 400.
3. Figure 5 - Sequence of steps changed to make installation of parts easier.
4. Figure 6 - Added instructions to install new deflector shield at STA 340.
5. Figure 7 - Added new Figure 7 instructions to replace insulation blanket.
Vertical lines are put on the left edge of each page, except in Paragraph 1.A., Effectivity, to show the location
of important changes.
Pages with no vertical lines have no important changes.
The data given in Information Notice 747-25A3581 R00 IN01 is included in this revision.
REVISION HISTORY
September 23, 2010Original Issue:
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June 30, 2011Revision 1:
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Commercial 
Airplanes
747
Service Bulletin
ALERT
SummaryNumber: 747-25A3581Original Issue: September 23, 2010
Revision 1: June 30, 2011
ATA System: 2500
SUBJECT: EQUIPMENT/FURNISHINGS - Cargo and Accessory Compartments - M826 Cardfile
Drip Shield Change
THIS BULLETIN IS SENT TO THE OPERATORS OF RECORD OF THE AIRPLANES SHOWN IN PARAGRAPH
1.A., EFFECTIVITY. IF AN AIRPLANE HAS BEEN LEASED OR SOLD, SEND THIS SERVICE BULLETIN TO
THE NEW OPERATOR. IF APPLICABLE SPARES HAVE BEEN SOLD, SEND THIS SERVICE BULLETIN TO
THE NEW OWNER.
CONCURRENT REQUIREMENTS
Refer to Paragraph 1.B., Concurrent Requirements.
BACKGROUND
This service bulletin will mitigate water from exiting over the edge of the existing drip shield and contaminating
electrical components in the M826 cardfile below. If this service bulletin is not incorporated, electrical components
in the M826 cardfile can malfunction due to water contamination which could result in an electrical short and
potential loss of several functions essential for safe flight.
An Operator reported finding evidence of water damage to Diode Fire Card 285U0072-1 in the M826 Automatic
Fire Overheat Logic Test System (AFOLTS) cardfile following a false FWD CARGO FIRE message which
resulted in an Air Turn Back (ATB). Measurements showed the drip shield sloped away from the two drains
added by SB 747-25A3370 (-400F) and SB 747-25A3526 (-400 Boeing Converted Freighter) and mandated by
Airworthiness Directive (AD). Boeing's subsequent investigation found other reports of water damage to circuit
cards in M826 affecting several operators.
This service bulletin replaces the existing drip shield with a new drip shield, installs two new drip shield deflectors
between the new drip shield and the two adjacent bulkheads, and relocates wire bundles that interfere with
these installations.
Boeing Service Related Problem (SRP) 747-SRP-25-0282 is related to this service bulletin.
ACTION (PRR 85901-100RS)
Do the following items:
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1. Remove existing drip shield
2. Relocate wire bundles
3. Install new drip shield's brackets
4. Install new drip shield
5. Install new drip shield deflectors
6. Install new blankets
EFFECTIVITY
747-400 Airplanes. Refer to Paragraph 1.A.1., Airplanes, for the list of affected airplanes.
COMPLIANCE
The Federal Aviation Administration (FAA) will possibly release an Airworthiness Directive related to this service
bulletin. The Airworthiness Directive will make the compliance tasks and times given in this service bulletin
mandatory.
Boeing recommends that the change given in this service bulletin be done within 24 months after the revision
1 issue date of this service bulletin.
INDUSTRY SUPPORT INFORMATION
Boeing warranty remedies may be available for airplanes in warranty as of October 8, 2008. Please refer to
Paragraph 2.B., Industry Support Information.
MANPOWER
Elapsed HoursTotal Task HoursAirplanes
14.7522.50GROUP 1
14.7522.50GROUP 2
MATERIAL INFORMATION
Boeing Supplied Kits/Parts.
Refer to Paragraph 2.A., Material - Price and Availability.
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BOEING SERVICE BULLETIN 747-25A3581
ALERT  ALERT
-REMOVE EXISTING DRIP SHIELD
-REMOVE EXISTING BLANKET
-REMOVE EXISTING BRACKETS
-RELOCATE EXISTING WIRE BUNDLES
-INSTALL NEW BRACKETS
-INSTALL NEW DRIP SHIELD
-INSTALL NEW DRIP SHIELD DEFLECTORS
-INSTALL NEW BLANKET
STA
400
STA
380
STA
360
STA
340
1964805
Original Issue: September 23, 2010
Revision 1: June 30, 2011  747-25A3581
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Commercial 
Airplanes
747
Service Bulletin
ALERT
Number: 747-25A3581
Original Issue: September 23, 2010
Revision 1: June 30, 2011
ATA System: 2500
SUBJECT: EQUIPMENT/FURNISHINGS - Cargo and Accessory Compartments - M826 Cardfile
Drip Shield Change
THIS BULLETIN IS SENT TO THE OPERATORS OF RECORD OF THE AIRPLANES SHOWN IN PARAGRAPH
1.A., EFFECTIVITY. IF AN AIRPLANE HAS BEEN LEASED OR SOLD, SEND THIS SERVICE BULLETIN TO
THE NEW OPERATOR. IF APPLICABLE SPARES HAVE BEEN SOLD, SEND THIS SERVICE BULLETIN TO
THE NEW OWNER.
1.    PLANNING INFORMATION
A. Effectivity
1. Airplanes
Refer to Service Bulletin Index D6-30300 Part 3 for Airplane Variable Number, Line Number, and
Serial Number data.
This service bulletin is for the airplanes shown below. An equivalent change is on subsequent
production airplanes. Refer to PRR 85901-100RS for data about this change.
DESCRIPTIONCONFIGURATIONGROUP
747-400 that did not get hardware equivelent to SB 747-25A3526
during conversion to BCF configuration.
-1
747-400 that did get hardware equivelent to SB 747-25A3526 during
conversion to BCF configuration.
-2
Airplane Models:
747-400
GroupVariable Number
2RM128
2RT021 - RT022
2RT031 - RT033
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GroupVariable Number
1RT071 - RT072
1RT075
2RT161
2RT164
1RT456
2RT461
1RT501
2RT506
1RT507 - RT510
1RT513
1RT516
1RT518
2RT519
1RT520
1RT524
2RT526
1RT528
2RT530
1RT572 - RT574
2RT575 - RT579
2RT642
1RT655 - RT657
1RT751
2RT752
1RT781 - RT782
2RT837
2RT967
2. Spares Affected
Examine your spares supply for the parts or components identified in Paragraph 2.C., Parts
Necessary for Each Airplane. If any parts or components are found, refer to Paragraph 2.C. for
the recommended use.
B. Concurrent Requirements
The service bulletin(s) listed below must be done before or at the same time as this service bulletin:
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Group 1:
DescriptionService BulletinCompany
(a) (b) Drip shield Modification747-25A3526, Revision 1Boeing
(a) Steps 1-5 of Figure 2 in service bulletin 747-25A3526 R1 are NOT required if work is being accomplished
concurrent with this service bulletin.
(b) The portion of "More Data" in step 8 of Figure 3 in service bulletin 747-25A3526 R1 which says "Attach
drain tube and strap above bead on the spud" is also NOT required.
Group 2:
None
C. Reason
This service bulletin will mitigate water from exiting over the edge of the existing drip shield and
contaminating electrical components in the M826 cardfile below. If this service bulletin is not incorporated,
electrical components in the M826 cardfile can malfunction due to water contamination which could
result in an electrical short and potential loss of several functions essential for safe flight.
An Operator reported finding evidence of water damage to Diode Fire Card 285U0072-1 in the M826
Automatic Fire Overheat Logic Test System (AFOLTS) cardfile following a false FWD CARGO FIRE
message which resulted in an Air Turn Back (ATB). Measurements showed the drip shield sloped away
from the two drains added by SB 747-25A3370 (-400F) and SB 747-25A3526 (-400 Boeing Converted
Freighter) and mandated by Airworthiness Directive (AD). Boeing's subsequent investigation found
other reports of water damage to circuit cards in M826 affecting several operators.
This service bulletin replaces the existing drip shield with a new drip shield, installs two new drip shield
deflectors between the new drip shield and the two adjacent bulkheads, and relocates wire bundles
that interfere with these installations.
Boeing Service Related Problem (SRP) 747-SRP-25-0282 is related to this service bulletin.
Revision 01 is sent to make changes to the service bulletin to correct an interference issue found during
parts mock-up for the 747-8.
D. Description
Do the following items:
1. Remove existing drip shield
2. Relocate wire bundles
3. Install new drip shield's brackets
4. Install new drip shield
5. Install new drip shield deflectors
6. Install new blankets
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Revision 1 - More work is necessary on the airplane(s) changed in accordance with the original issue
of this service bulletin. New deflector shield installation at STA 340 and insulation blanket replacement
have been added. No airplane has incorporated the original issue of this service bulletin.
The work in this service bulletin is done in the maintenance zone(s) given below.
Affected Maintenance Zones
ZoneModel
115747-400
E. Compliance
The Federal Aviation Administration (FAA) will possibly release an Airworthiness Directive related to
this service bulletin. The Airworthiness Directive will make the compliance tasks and times given in this
service bulletin mandatory.
Boeing recommends that the change given in this service bulletin be done within 24 months after the
revision 1 issue date of this service bulletin.
F. Approval
This service bulletin was examined by the Federal Aviation Administration (FAA). The changes specified
in this service bulletin comply with the applicable regulations and are FAA approved, as well as European
Aviation Safety Agency (EASA)/Joint Aviation Authorities (JAA) approved for all EASA/JAA approved
airplanes listed in the service bulletin effectivity. This service bulletin and its approval were based on
the airplane in its original Boeing delivery configuration or as modified by other approved Boeing
changes.
If an airplane has a non-Boeing modification or repair that affects a component or system also affected
by this service bulletin, the operator is responsible for obtaining appropriate regulatory agency approval
before incorporating this service bulletin.
G. Manpower
The table below shows an estimate of the task hours necessary to do this change for each airplane.
This estimate is for direct labor only, done by an experienced crew. Adjust the estimate with operator
task hour data if necessary. The estimate does not include lost time. These are some examples of lost
time:
 Time to adjust to the workplace
 Time to schedule the work
 Time to inspect the work
 Time to cure the materials
 Time to make the parts
 Time to find the tools.
Elapsed HoursTask HoursNumber of PersonsTask
0.250.251Open Access
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Elapsed HoursTask HoursNumber of PersonsTask
2.752.751Figure 1
2.254.502Figure 2
1.501.501Figure 3
3.256.502Figure 4
2.254.502Figure 5
1.251.251Figure 6
1.001.001Figure 7
0.250.251Test
14.7522.50TOTAL FOR EACH AIRPLANE
H. Weight and Balance Changes
Change in Moment
(Pound-Inches)
Change in Weight
(Pounds)Airplane
+2717.0+7.3Group 1
+2717.0+7.3Group 2
I. Electrical Load Data
Not changed.
J. References
1. Existing Data
a. Engineering Change Memo PRR 85901-100RS
b. Boeing Service Bulletin 747-25A3526
c. Boeing Service Related Problem (SRP) 747-SRP-25-0282
d. Standard Overhaul Practices Manual (SOPM) 20-15-19, 20-43-03, 20-50-12
e. Standard Wiring Practices Manual (SWPM) 20-10-11, 20-10-12, 20-10-19
f. 747-400 Aircraft Maintenance Manual (AMM) 53-21-02
g. 747-400SF Structural Repair Manual (SRM) Chapter 51
h. Service Bulletin Index D6-30300
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2. Data supplied with this Service Bulletin
None.
3. Installation Drawings Used in the Preparation of this Service Bulletin
TitleDrawing Number
BLANKET ASSEMBLY INSULATION411U4403
DRIP SHIELD INSTL - CARD FILE - NOSE WHEEL WELL LH
SIDE
828B4240
WIRE BUNDLE INSTALLATION - NOSE SECTION 41828B8101
These drawings were used to prepare this service bulletin. These drawings are not necessary to
make the specified changes, and are not supplied with this service bulletin. These drawings may
not be applicable to all airplane configurations or operators.
K. Publications Affected
1. Publications:
Chapter-SectionPublication
53-11747 Illustrated Parts Catalog
2. Damage Tolerance Based Structural Inspections:
Boeing has evaluated the repairs and/or changes in this service bulletin for effects on Fatigue
Critical Structure (FCS) and for changes to Damage Tolerance Inspections (DTI) required in the
Maintenance Program. This service bulletin affects FCS but no new DTIs are necessary.
L. Interchangeability and Intermixability of Parts
Refer to Paragraph 2.C., Parts Necessary for Each Airplane, for interchangeability and intermixability
information.
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2.    MATERIAL INFORMATION
A. Material - Price and Availability
Boeing can supply the kits shown in Paragraph 2.C., Parts Necessary for Each Airplane , as shown
below. If there is a limit to the quantity of available , a supply sequence is given by Spares. More become
available as shown in the Reorder Lead Time (ROLT). ROLT is calculated from the date Boeing gets
the purchase order.
REFER TO THE BOEING PART PAGE ON MYBOEINGFLEET.COM OR CONTACT FIRST RESPONDER
AT FR@BOEING.COM FOR THE LATEST REORDER LEAD TIME (ROLT) AND PRICE INFORMATION
Unit Price thru
04/30/2012
ROLT (Calendar
Days)
QTYDateNameKit Number
$8,844.0050018/2/2011TOP KIT - AFOLTS
DRIP SHIELD MODIFI-
CATION
015U1884-1
The Kits are subject to the terms and conditions of the Boeing standard purchase order acknowledgment.
After the Unit Price date, new price data is applicable. Prices are in United States dollars. Terms: Net
30 days.
Reference this service bulletin and submit your purchase order by one of the methods that follow:
1. Order on-line via ATA Spec 2000 or Boeing Part Page
2. Fax to (206) 662-7145
3. Mail to:
Spares Customer Support - MC 36-65
Boeing Spares Department
P.O. Box 3707
Seattle, Washington 98124-2207 USA
B. Industry Support Information
Boeing warranty remedies may be available for service bulletin kits purchased for SB 747-25A3581.
Send a warranty claim to Boeing Product Assurance Contracts.
C. Parts Necessary For Each Airplane
1. Kits/Parts
To get the kits/parts shown below, refer to Paragraph 2.A., Material - Price and Availability.
NOTE: One top kit and the items shown in Paragraph 2.C.2., Parts and Materials Supplied by
the Operator, are necessary for each airplane.
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Kit 015U1884
NotesNameQTYNew Part Number
-1
NUT
SPACER
ASSY
BRACKET ASSY1287U0072-53
BLANKET ASSY - INSULATION1411U4403-1001
DRIP SHIELD - FWD BRACKET1672U7102-1
DRIP SHIELD - STA 380 BRACKET ASSY1672U7102-10
DRIP SHIELD - ASSY1672U7102-11
DRIP SHIELD - DEFLECTOR PLATE4672U7102-12
DRIP SHIELD - DEFLECTOR PLATE1672U7102-13
DRIP SHIELD - DEFLECTOR1672U7102-14
DRIP SHIELD - AFT BRACKET1672U7102-2
DRIP SHIELD - DEFLECTOR1672U7102-6
WIRE BRACKET ASSY2672U7102-8
DRIP SHIELD - STA 360 BRACKET ASSY1672U7102-9
GROMMET169B47961-5
BOLT, PROTRUDING HD2BACB30VN6K7
BOLT, PROTRUDING HD2BACB30VN6K8
(a)BOLT, PROTRUDING HEAD15BACB30VT6K3
(a)BOLT, PROTRUDING HEAD8BACB30VT6K4
BOLT, PROTRUDING HEAD1BACB30VT6K7
BOLT, PROTRUDING HEAD5BACB30VT8K6
BOLT, PROTRUDING HEAD3BACB30VT8K7
BOLT, PROTRUDING HEAD2BACB30VT8K8
CLAMP, LOOP1BACC10DK12
COLLAR4BACC30BK6
(a)COLLAR24BACC30BL6
COLLAR10BACC30BL8
NUT, SPACER PLATE1BACN10GH3A10
NUT3BACN10YR3CD
(a)RIVET, 100 DEG9BACR15BA4AD6C
(a)RIVET, 100 DEG6BACR15BA5AD4C
(a)RIVET, 100 DEG6BACR15BA5AD5C
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Kit 015U1884
NotesNameQTYNew Part Number
-1
(a)RIVET, UNIVERSAL HEAD22BACR15BB5AD6C
SCREW, CAP1BACS12GU3K30
(a)BOLT5BACS12HN3-10
(a)BOLT3BACS12HN3-11
BOLT1BACS12HN3-12
BOLT1BACS12HN3-20
(a)BOLT8BACS12HN3-9
(a)RINGPOST, WIRE HARNESS MOUNTING SUPPORT20BACS31H2B
STRAP1BACS38K3
STRAP2BACS38K1
(a)TIE STRAP50BACS38W1
(a)WASHER6NAS1149D0332J
(a)WASHER, FLAT16NAS1149D0363J
SPACERS FOR BOLTS1NAS43DD3-48FC
SPACERS FOR BOLTS1NAS43DD3-18FC
SPACERS FOR BOLTS1NAS43DD3-50FC
(a)SPACER, SLEEVE3NAS43DD6-9FC
(a) There are more parts than are necessary
(b) If grip length shown is not available at Boeing, fasteners supplied in kits may be one grip length longer
than indicated. Also, if any fasteners part numbers listed are not available or have been superseded,
substitute fasteners may be supplied in kits. Boeing Document D-590 and Boeing Drawing 65B88700 are
used to determine the part numbers used as substitutes.
2. Parts and Materials Supplied by the Operator
NotesNameQTYPart Number /
Specification
(a)SEALANT12 OZBMS 5-95
(a)ADHESIVE12 OZBMS 5-92
(a)CORROSION INHIBITING COM-
POUND
8 OZBMS 3-27
(a)ALODINE SOLUTION8 OZALODINE 1200 or
1200S
(a) See the Qualified Products List at the end of the Boeing Material Specification (BMS) for
supplier data.
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### Page 20

3. Parts Modified and Reidentified
None.
4. Parts Removed and Not Replaced
None.
D. Parts Necessary to Change Spares
None.
E. Special Tooling - Price and Availability
None.
F. Special Tooling Necessary to do this Service Bulletin
No special tools or equipment are necessary to do the change in this service bulletin. But, maintenance
and overhaul tools in the manuals given in Paragraph 1.J., References, can be necessary. Examine
operator tool supply to make sure all necessary tools are available.
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### Page 21

3.    ACCOMPLISHMENT INSTRUCTIONS
A. GENERAL INFORMATION
CAUTION: KEEP THE WORK AREA, WIRES AND ELECTRICAL BUNDLES CLEAN OF METAL
PARTICLES OR CONTAMINATION WHEN YOU USE TOOLS. UNWANTED MATERIAL,
METAL PARTICLES OR CONTAMINATION CAUGHT IN WIRE BUNDLES CAN CAUSE
DAMAGE TO THE BUNDLES. DAMAGED WIRE BUNDLES CAN CAUSE SPARKS OR
OTHER ELECTRICAL DAMAGE.
NOTE: 1. The instructions identified in Paragraph 3.B., Work Instructions, and the Figure(s)
give the recommended sequence of steps. The sequence of steps to do this service
bulletin can be changed.
2. Manual titles are referred to by acronyms. Refer to Paragraph 1.J., References, for
definition of the acronyms.
3. Obey all of the warnings and cautions given in the specified manual sections.
4. Unless shown differently, these dimensions and tolerances are used:
– Linear dimensions are in inches
– Tolerance on linear dimensions, other than rivet and bolt edge margins, is plus
or minus 0.03 inch
– Tolerance on rivet and bolt edge margin is plus or minus 0.05 inch
– Angular tolerance is plus or minus 2 degrees
– Hole dimensions for standard solid rivets are given in 747 SRM 51
– Torque limits to tighten nuts and bolts are given in 747 SRM 51
5. Use the approved fastener and process material substitutions in accordance with
747 SRM 51. Alternate fasteners are listed in 747 SRM 51 and Boeing Drawing
012W6100 .
6. Refer to the SWPM 20-10-11 and SWPM 20-10-12 for the wire installation procedures,
and SWPM 20-10-19 for the wire separation requirements, as accepted procedures.
7. If the length of any fastener specified in this service bulletin does not meet the
installation standards in 747-400SF SRM 51, then a fastener of the same specification,
or an approved substitute, with a length which meets the installation standards in
747-400SF SRM 51 may be used.
8. These work instructions refer to procedures included in other Boeing documents.
When the words "refer to" are used and the operator has an accepted alternative
procedure, the accepted alternative procedure can be used. When the words "in
accordance with" are included in the instruction, the procedure in the Boeing document
must be used.
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BOEING SERVICE BULLETIN 747-25A3581
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### Page 22

B. WORK INSTRUCTIONS
1. Remove main deck floor panels between STA 340 and STA 400 and LBL 80 and LBL 0. Refer to
747-400 AMM 53-21-02 as an accepted procedure.
2. Remove existing drip shield in accordance with Figure 1.
3. Loosen wire bundles routing in accordance with Figure 2.
4. Install provisions for wire bundle routing in accordance with Figure 3.
5. Relocate wire bundle routing in accordance with Figure 4.
6. Install new drip shield in accordance with Figure 5.
7. Install drip shield deflectors in accordance with Figure 6.
8. Replacement of insulation blanket in accordance with Figure 7.
9. Install main deck floor panels between STA 340 and STA 400 and LBL 80 and LBL 0. Refer to
747-400 AMM 53-21-02 as an accepted procedure.
10. Put the airplane back to a serviceable condition.
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BOEING SERVICE BULLETIN 747-25A3581
ALERTALERT

### Page 23 (OCR)

BOEING SERVICE BULLETIN 747-25A3581
ALERT  ALERT
STA  TYPICAL
400
STA 400
BULKHEAD
STA
340
STA
340
TYPICAL  1959064
FIGURE 1: ELECTRONICS EQUIPMENT CENTER - REMOVAL OF EXISTING DRIP SHIELD
(SHEET 1 OF 5)
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### Page 24 (OCR)

BOEING SERVICE BULLETIN 747-25A3581
ALERT  ALERT
_WL
186
STA
340
STA  FWD
360
STA
A-A  400
FIGURE 1: ELECTRONICS EQUIPMENT CENTER - REMOVAL OF EXISTING DRIP SHIELD
(SHEET 2 OF 5)
Original issue: September 23, 2010
Revision 1 June 30, 2011  BOEING PROPRIETARY -
Copyright © Unpublished Work - See page 1 for details.

### Page 25 (OCR)

BOEING SERVICE BULLETIN 747-25A3581
ALERT  ALERT
C
~ STRAP
CLAMP
WASHER
SCREW  STANDOFF
INBD
STA 340 BULKHEAD  LBL
(VIEW LOOKING FORWARD)  20
B-B
LBL
25.60
INBD
C-C  1963098
FIGURE 1: ELECTRONICS EQUIPMENT CENTER - REMOVAL OF EXISTING DRIP SHIELD
(SHEET 3 OF 5)
Original Issue: September 23, 2010
Revision 1 June 30, 2011  747-25A3581
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### Page 26 (OCR)

BOEING SERVICE BULLETIN 747-25A3581
ALERT  ALERT
) BRACKET  BRACKET 8
STA
STA 340  380  FWD
BULKHEAD  STA 400 •
TYPICAL  E-E  BULKHEAD
D-D  STA
400
STA
360
STA
340
BRACKET
5) 10 LOCATIONS
STA 400
BULKHEAD
F-F
1963095
The step numbers shown below agree with the numbers shown in the circle symbols in the figure. The QTY
numbers shown below are the number of parts necessary for this figure.
FIGURE 1: ELECTRONICS EQUIPMENT CENTER - REMOVAL OF EXISTING DRIP SHIELD
(SHEET 4 OF 5)
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### Page 27

MORE DATAQTYIDENTIFICATIONNAMETASKSTEP
near STA 340 and STA 4002BACS38K1STRAPRemove1
1-DRAINAGE TUBE
CLAMP
Remove2
STA 340, LBL 25.60, WL 1802-FASTENERRemove
From horizontal stiffener (STA
340, LBL 25.60, WL 180)
1-SUPPORTING
STANDOFF
Remove
(a) Fill holes in horizontal stiff-
ener (STA 340, LBL 25.60, WL
180)
2BACR15BA4AD6CRIVET, 100 DEGInstall (New)
(b) Typical:--DRAINAGE TUBE
CLAMP
Loosen3
1 STA 340 and 3 STA 400
near STA 340 and STA 4002-DRAINAGE TUBEDisconnect4
6 (STA 340) and 4 (STA 400)10-FASTENERRemove5
at STA 3603-SCREWRemove6
at STA 3803-SCREWRemove
284U1364-1, or -2, or -3.1-DRIP SHIELDRemove7
3 (STA 340 bulkhead) and 1
(STA 400 bulkhead)
4284U1363-1BRACKET - DRIP
SHIELD MOUNTING
Remove8
6 (STA 340 bulkhead) and 2
(STA 400 bulkhead)
8-FASTENERRemove
(a) Fill holes 6 (STA 340) and
2 (STA 400). Flush is not re-
quired.
8BACR15BA5AD4CRIVET, 100 DEGInstall (New)
STA 400 bulkhead1284U1363-4BRACKET - DRIP
SHIELD MOUNTING
Remove9
STA 400 bulkhead2-FASTENERRemove
(a) Fill holes 2 (STA 400 bulk-
head). Flush is not required.
2BACR15BA5AD4CRIVET, 100 DEGInstall (New)
at STA 3603-NUTPLATERemove10
at STA 3803-NUTPLATERemove
(a) Apply Alodine 1200 conversion coating and corrosion inhibiting compound (BMS3-27). Refer to SOPM
20-43-03 and 747-400SF SRM Chapter 51 as accepted procedures.
(b) Loosen the drain tube clamp(s) from the supporting standoff as needed.
FIGURE 1: ELECTRONICS EQUIPMENT CENTER - REMOVAL OF EXISTING DRIP SHIELD
(SHEET 5 OF 5)
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BOEING SERVICE BULLETIN 747-25A3581
ALERTALERT

### Page 28 (OCR)

BOEING SERVICE BULLETIN 747-25A3581
ALERT  ALERT
STA
400
STA
1962728
FIGURE 2: ELECTRONICS EQUIPMENT CENTER - LOOSEN AFFECTED WIRE BUNDLES
(SHEET 1 OF 4)
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### Page 29 (OCR)

BOEING SERVICE BULLETIN 747-25A3581
ALERT  ALERT
STA  W1341
400  W4511
W4512
W5030
W8610
W8611  W4511
W1341
LBL  W4512
20  W5030
STA  W8610
380  W8611
LBL
40
LBL  , W5172
50
W4753
W4756
W4762
STA 400
BULKHEAD
WIRE BUNDLES NOT SHOWN FOR CLARITY
1961527
FIGURE 2: ELECTRONICS EQUIPMENT CENTER - LOOSEN AFFECTED WIRE BUNDLES
(SHEET 2 OF 4)
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### Page 30 (OCR)

BOEING SERVICE BULLETIN 747-25A3581
ALERT  ALERT
STA 400
BULKHEAD
LBL
30
LBL
WIRE BUNDLES NOT SHOWN FOR CLARITY
40
1961528
The step numbers shown below agree with the numbers shown in the circle symbols in the figure. The QTY
numbers shown below are the number of parts necessary for this figure.
FIGURE 2: ELECTRONICS EQUIPMENT CENTER - LOOSEN AFFECTED WIRE BUNDLES
(SHEET 3 OF 4)
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### Page 31

MORE DATAQTYIDENTIFICATIONNAMETASKSTEP
FORWARD SIDE OF STA 400
BULKHEAD
--WIRE BUNDLESLoosen1
CLAMPS LOCATED AT WIRE
BRACKET ASSY LBL 38 AND
LBL 50
-BACC10DK12CLAMP, LOOPRemove2
(a) (b) (c)-BACC10DK12CLAMP, LOOPRemove3
(a) For W4511, W4512, W1341, W5030, W8610, W8611 remove from clamps located at STA 400, LBL40,
WL 188.8
(b) For W5172 remove from clamp located at STA 400, LBL 50, WL 189.
(c) For W4753, W4756, W4762 remove from clamp located at STA 400, LBL 50, WL 189.
FIGURE 2: ELECTRONICS EQUIPMENT CENTER - LOOSEN AFFECTED WIRE BUNDLES
(SHEET 4 OF 4)
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BOEING SERVICE BULLETIN 747-25A3581
ALERTALERT

### Page 32 (OCR)

BOEING SERVICE BULLETIN 747-25A3581
ALERT  ALERT
STA
400
STA
1962729
FIGURE 3: ELECTRONICS EQUIPMENT CENTER - PROVISIONS FOR WIRE BUNDLE RELOCATION
(SHEET 1 OF 5)
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### Page 33 (OCR)

BOEING SERVICE BULLETIN 747-25A3581
ALERT  ALERT
BULKHEAD
LBL
30
WIRE BUNDLES NOT SHOWN FOR CLARITY  LBL  B BEFORE
40
C AFTER  1962731
FIGURE 3: ELECTRONICS EQUIPMENT CENTER - PROVISIONS FOR WIRE BUNDLE RELOCATION
(SHEET 2 OF 5)
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### Page 34 (OCR)

BOEING SERVICE BULLETIN 747-25A3581
ALERT  ALERT
LBL
40
LBL
50
LBL
40
LBL
50
BEFORE
0.563.
7.50
7.50
AFTER
1962732
The step numbers shown below agree with the numbers shown in the circle symbols in the figure. The QTY
numbers shown below are the number of parts necessary for this figure.
FIGURE 3: ELECTRONICS EQUIPMENT CENTER - PROVISIONS FOR WIRE BUNDLE RELOCATION
(SHEET 3 OF 5)
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### Page 35

MORE DATAQTYIDENTIFICATIONNAMETASKSTEP
LBL 38, STA 4001287U0073-57BRACKET ASSYRemove1
2-FASTENERRemove
UPPER NUT SPAC-
ER ASSY
1287U0072-53NUT SPACER ASSYRemove2
LBL 38, STA 4002-FASTENERRemove
(a) (b) PLUG OPEN
HOLES
2BACB30VN6K7BOLT, PROTRUDING
HD
Install (New)3
2BACC30BK6COLLARInstall (New)
(a) Pick up existing
Fasteners
2-HOLEDrill4
LBL 38, STA 4001287U0072-53NUT SPACER ASSYInstall (New)
2BACB30VN6K8BOLT, PROTRUDING
HD
Install (New)
2BACC30BK6COLLARInstall (New)
LBL 38, STA 4001672U7102-8WIRE BRACKET ASSYInstall (New)5
2BACS12HN3-10BOLTInstall (New)
2NAS1149D0332JWASHERInstall (New)
STA 400, LBL 501287U0073-55BRACKETRemove6
2-FASTENERRemove
UPPER NUT SPAC-
ER
1-NUT, SPACER PLATERemove7
STA 400, LBL 50,
WL 186
2-FASTENERRemove
(a) (b) PLUG OPEN
HOLES
2BACR15BB5D5CRIVETInstall (New)8
(a)2DIA. 0.128 - 0.135HOLEDrill9
LBL 50, STA 4001BACN10GH3A10NUT, SPACER PLATEInstall (New)
2BACR15BB4D5CRIVET, UNIVERSAL
HEAD
Install (New)
LBL 50, STA 4001672U7102-8WIRE BRACKET ASSYInstall (New)10
2BACS12HN3-10BOLTInstall (New)
2NAS1149D0332JWASHERInstall (New)
(a) Apply Alodine 1200 conversion coating and corrosion inhibiting compound (BMS3-27). Refer to SOPM
20-43-03 as an accepted procedure.
FIGURE 3: ELECTRONICS EQUIPMENT CENTER - PROVISIONS FOR WIRE BUNDLE RELOCATION
(SHEET 4 OF 5)
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BOEING SERVICE BULLETIN 747-25A3581
ALERTALERT

### Page 36

MORE DATAQTYIDENTIFICATIONNAMETASKSTEP
(b) Refer to 747-400SF SRM Chapter 51 as an accepted procedure.
FIGURE 3: ELECTRONICS EQUIPMENT CENTER - PROVISIONS FOR WIRE BUNDLE RELOCATION
(SHEET 5 OF 5)
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BOEING SERVICE BULLETIN 747-25A3581
ALERTALERT

### Page 37 (OCR)

BOEING SERVICE BULLETIN 747-25A3581
ALERT  ALERT
STA
400
STA
1962734
FIGURE 4: ELECTRONICS EQUIPMENT CENTER - RELOCATE WIRE BUNDLES ROUTING
(SHEET 1 OF 4)
Original Issue: September 23, 2010
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Copyright © Unpublished Work - See page 1 for details.  37 of 55

### Page 38 (OCR)

BOEING SERVICE BULLETIN 747-25A3581
ALERT  ALERT
W1341
W5030
W8610
,W8611
W4753
W4756
W4762
W4511
W4512
~ W5172
W1341
W4511
W4512
W5030
W8610
W8611
• STA 400
BULKHEAD
LBL  LBL  LBL  LBL  LBL
19  24  29  34.5  40
LBI
45
The step numbers shown below agree with the numbers shown in the circle symbols in the figure. The QTY
numbers shown below are the number of parts necessary for this figure.
FIGURE 4: ELECTRONICS EQUIPMENT CENTER - RELOCATE WIRE BUNDLES ROUTING
(SHEET 2 OF 4)
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Copyright © Unpublished Work - See page 1 for details.  38 of 55

### Page 39

MORE DATAQTYIDENTIFICATIONNAMETASKSTEP
(a) Replace
BACC10DK Clamps
with BACS31H2B
Ring posts and
BACS38W1 Straps
as needed to allow
re-routing.
15BACS31H2BRING POST, WIRE
MOUNTING SUPPORT
Install (New)1
Route and strap to
the ring posts as
necessary
--WIRE BUNDLESInstall (Kept)2
(b) W4511, W4512
and W1341, W5030,
W8610, W8611
strap to ring post at
the old bracket.
6-WIRE BUNDLESRoute3
W4511 and W4512
break out to the card
file
2-WIRE BUNDLESRoute
(b) W5172 routing
support is no longer
required from the
clamp at WL 189,
LBL 50, STA 400
bulkhead.
1-WIRE BUNDLERoute4
Readjust the posi-
tion of the strap on
the ECS duct to al-
low re-routing.
-BACS38K3STRAPInstall (New)5
FIGURE 4: ELECTRONICS EQUIPMENT CENTER - RELOCATE WIRE BUNDLES ROUTING
(SHEET 3 OF 4)
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39 of 55
BOEING SERVICE BULLETIN 747-25A3581
ALERTALERT

### Page 40

MORE DATAQTYIDENTIFICATIONNAMETASKSTEP
(b) (c) W4753,
W4756, W4762 at-
tach to an existing
standoff that carries
a drainage line at
LBL 51 and WL 183
3-WIRE BUNDLESRoute6
Support is no longer
required from the
clamp located at WL
189, LBL 50.
1BACC10DK12CLAMP, LOOPRoute
1NAS43DD3-48FCSPACERS FOR
BOLTS
Install (New)
To maintain separa-
tion of Coax wire
bundles
-69B47961-5GROMMETInstall (New)
1NAS1149D0332JWASHERInstall (New)
1BACS12GU3K30SCREW, CAPInstall (New)
To hold wire bundles
to the ring posts
36BACS38W1TIE STRAPInstall (New)7
(a) Add and install ringposts as required to support wiring in the airplane, variance of the ring post locations
is acceptable to allow rerouting attachment in a more confined space.
(b) Maintain original wire separations as required. Refer to SWPM 20-10-19 as an accepted procedure.
(c) Use filler rod and adjustable straps where required.
FIGURE 4: ELECTRONICS EQUIPMENT CENTER - RELOCATE WIRE BUNDLES ROUTING
(SHEET 4 OF 4)
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BOEING SERVICE BULLETIN 747-25A3581
ALERTALERT

### Page 41 (OCR)

BOEING SERVICE BULLETIN 747-25A3581
ALERT  ALERT
STA
400
STA
380
STA
360
STA
340
1962738
FIGURE 5: ELECTRONICS EQUIPMENT CENTER - INSTALLATION OF ALL SUPPORT BRACKETS AND
NEW DRIP SHIELD ASSEMBLY
(SHEET 1 OF 8)
Original Issue: September 23, 2010
Revision 1 June 30, 2011  BOEING PROPRIETARY -
Copyright © Unpublished Work - See page 1 for details.  9910 Lt

### Page 42 (OCR)

BOEING SERVICE BULLETIN 747-25A3581
ALERT  ALERT
6 LOCATIONS (3
1.00°
1.00
23.50
STA  12.91
360
4.06
0.57
TYPICAL
5 LOCATIONS (5
1.00%  EXISTING
23.50  FASTENER  LOCATIONS
STA  380  ≤ 9,54
4.06
1.03
TYPICAL
1962741
FIGURE 5: ELECTRONICS EQUIPMENT CENTER - INSTALLATION OF ALL SUPPORT BRACKETS AND
NEW DRIP SHIELD ASSEMBLY
(SHEET 2 OF 8)
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### Page 43 (OCR)

BOEING SERVICE BULLETIN 747-25A3581
ALERT  ALERT
CHORD  LOWER  ) NUT  _ LOWER CHORD  8) NUT
WASHERS
SPACER 9  STA  8) SPACER
340  DRIPSHIELD (6
DRIPSHIELD (6  A-A  9) BOLT  STA  360  8) WASHERS
(8) BOLT
B-B
STA
380
BULKHEAD  STA 400  1962746
FIGURE 5: ELECTRONICS EQUIPMENT CENTER - INSTALLATION OF ALL SUPPORT BRACKETS AND
NEW DRIP SHIELD ASSEMBLY
(SHEET 3 OF 8)
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### Page 44 (OCR)

BOEING SERVICE BULLETIN 747-25A3581
ALERT  ALERT
/ TOP OF MAIN DECK
FLOOR BEAM  EXISTING FASTENERS
TO REMAIN
16.44
1.26
EXISTING
EXISTING  FASTENERS
FASTENERS  TO REMAIN
TO REMAIN
0.19
STA 340
EXISTING
FASTENERS
TO REMAIN
FIGURE 5: ELECTRONICS EQUIPMENT CENTER - INSTALLATION OF ALL SUPPORT BRACKETS AND
NEW DRIP SHIELD ASSEMBLY
(SHEET 4 OF 8)
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### Page 45 (OCR)

BOEING SERVICE BULLETIN 747-25A3581
ALERT  ALERT
TOP OF MAIN DECK
FLOOR BEAM
8 LOCATIONS (16
16.4
•
TYPICAL
/ 16.89
STA 400  1962745
BULKHEAD
0.37  TYPICAL
The step numbers shown below agree with the numbers shown in the circle symbols in the figure. The QTY
numbers shown below are the number of parts necessary for this figure.
FIGURE 5: ELECTRONICS EQUIPMENT CENTER - INSTALLATION OF ALL SUPPORT BRACKETS AND
NEW DRIP SHIELD ASSEMBLY
(SHEET 5 OF 8)
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Revision 1 June 30, 2011  747-25A3581
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### Page 46

MORE DATAQTYIDENTIFICATIONNAMETASKSTEP
(a) (b) Fill holes in lower chord.
1 hole STA 360 and 3 holes in
STA 380. TYPICAL, CONFIGU-
RATION MAY VARY
4BACR15BA4AD6CRIVET, 100 DEGInstall (New)1
Position bracket at installation
indicated by figure at STA 360
1672U7102-9DRIP SHIELD - STA
360 BRACKET ASSY
Locate2
(a) (b)6DIA. 0.187 - 0.190HOLEDrill3
5 EXISTING HOLES + 1 NEW
HOLES (TYPICAL)
(a) INSTALL BRACKET TO
LOWER CHORD STA 360
6BACB30VT6K3BOLT, PROTRUDING
HEAD
Install (New)
(a)6BACC30BL6COLLARInstall (New)
Position bracket at installation
indicated by figure at STA 380
1672U7102-10DRIP SHIELD - STA
380 BRACKET ASSY
Locate4
(a) (b)5DIA. 0.187 - 0.190HOLEDrill5
3 EXISTING HOLES + 2 NEW
HOLES (TYPICAL)
(a) INSTALL BRACKET TO
LOWER CHORD STA 380
5BACB30VT6K3BOLT, PROTRUDING
HEAD
Install (New)
(a)5BACC30BL6COLLARInstall (New)
Position dripshield at installa-
tion indicated by figure
1672U7102-11DRIP SHIELD - ASSYInstall (New)6
Backdrill through drip shield in
location of nutplates on
672U7102-9 and 672U7102-10.
7BACS12HN3-9BOLTInstall (New)7
(a) 4 at STA 360 and 3 at STA
380
7NAS1149D0363JWASHER, FLATInstall (New)
Install bolts wet with BMS 5-95
sealant.
-BMS 5-95SEALANTApply
(a) (b) Backdrill through drip
shield in location of nutplate on
lower chord STA 380
1BACS12HN3-20BOLTInstall (New)8
Washer goes to each side of
the drip shield
1NAS1149D0363JWASHER, FLATInstall (New)
Washer goes to each side of
the drip shield
1NAS1149D0363JWASHER, FLATInstall (New)
(a)1NAS43DD3-50FCSPACERS FOR
BOLTS
Install (New)
(a)1BACN10YR3CDNUTInstall (New)
FIGURE 5: ELECTRONICS EQUIPMENT CENTER - INSTALLATION OF ALL SUPPORT BRACKETS AND
NEW DRIP SHIELD ASSEMBLY
(SHEET 6 OF 8)
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Original Issue: September 23, 2010
747-25A3581Revision 1 June 30, 2011
46 of 55
BOEING SERVICE BULLETIN 747-25A3581
ALERTALERT

### Page 47

MORE DATAQTYIDENTIFICATIONNAMETASKSTEP
(a) (b) Backdrill through drip
shield in location of nutplate on
lower chord STA 360
1BACS12HN3-12BOLTInstall (New)9
Washer goes to each side of
the drip shield
1NAS1149D0363JWASHER, FLATInstall (New)
Washer goes to each side of
the drip shield.
1NAS1149D0363JWASHER, FLATInstall (New)
(a)1NAS43DD3-18FCSPACERS FOR
BOLTS
Install
(Changed)
(a)1BACN10YR3CDNUTInstall
(Changed)
(a) (b) Make sure the collars
are on the forward side of the
STA 340 bulkhead.
--FASTENERInspect10
Position bracket at installation
indicated by figure at STA 340
1672U7102-1DRIP SHIELD - FWD
BRACKET
Locate11
(a) (b) Pick 6 existing rivet loca-
tions to match holes drill in the
drip shield forward bracket.
(STA 340 Bulkhead)
6-HOLEDrill
(a)2BACB30VT8K8BOLT SHEAR LIGHTInstall (New)12
STA 340
(a)2BACC30BL8COLLARInstall (New)
(a)1BACB30VT6K7HI - LOKInstall (New)13
STA 340
(a)1BACC30BL6COLLARInstall (New)
(a)3BACB30VT8K7BOLTInstall (New)14
(a)3BACC30BL6COLLARInstall (New)
Position bracket at installation
indicated by figure at STA 400
1672U7102-2DRIP SHIELD - AFT
BRACKET
Locate15
(a) (b) 8 New holes (STA 400)8DIA. 0.191 - 0.202HOLEDrill16
(a) INSTALL DRIP SHIELD
AFT BRACKET TO STA 400
BULKHEAD
8BACB30VT6K4BOLTInstall (New)17
(a)8BACC30BL6COLLARInstall (New)
(c)2-DRAINAGE TUBEConnect18
(c)2BACS38K1STRAPInstall (New)
FIGURE 5: ELECTRONICS EQUIPMENT CENTER - INSTALLATION OF ALL SUPPORT BRACKETS AND
NEW DRIP SHIELD ASSEMBLY
(SHEET 7 OF 8)
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Copyright © Unpublished Work - See page 1 for details.
Original Issue: September 23, 2010
747-25A3581Revision 1 June 30, 2011
47 of 55
BOEING SERVICE BULLETIN 747-25A3581
ALERTALERT

### Page 48

MORE DATAQTYIDENTIFICATIONNAMETASKSTEP
(a) Apply Alodine 1200 conversion coating and corrosion inhibiting compound (BMS3-27). Refer to SOPM
20-43-03 and 747-400SF SRM Chapter 51 as accepted procedures.
(b) Dimensions are typical. Pick up existing fastener holes where possible. Variance of fastener locations is
always acceptable when picking up existing holes. Pick up and fill fastener holes as required. Unless
otherwise specified, all plug rivets (new and existing) must be flush with surface as to not interfere with
Drip Shield installation.
(c) Attach drain tube and strap above the bead on the spud. Trim to fit drain lines as required. Tighten all the
screw(s) along the drain lines if it was loosen. If there are no drainage tubes, the AFT and FWD DRAINAGE
TUBES may be installed in accordance with service bulletin 747-25A3526.
FIGURE 5: ELECTRONICS EQUIPMENT CENTER - INSTALLATION OF ALL SUPPORT BRACKETS AND
NEW DRIP SHIELD ASSEMBLY
(SHEET 8 OF 8)
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Copyright © Unpublished Work - See page 1 for details.
Original Issue: September 23, 2010
747-25A3581Revision 1 June 30, 2011
48 of 55
BOEING SERVICE BULLETIN 747-25A3581
ALERTALERT

### Page 49 (OCR)

BOEING SERVICE BULLETIN 747-25A3581
ALERT  ALERT
STA
400
STA
380
STA
360
STA
1962751
FIGURE 6: ELECTRONICS EQUIPMENT CENTER - INSTALLATION OF DRIP SHIELD DEFLECTORS
(SHEET 1 OF 4)
Original Issue: September 23, 2010
Revision 1 June 30, 2011  BOEING PROPRIETARY -
Copyright © Unpublished Work - See page 1 for details.

### Page 50

FIGURE 6: ELECTRONICS EQUIPMENT CENTER - INSTALLATION OF DRIP SHIELD DEFLECTORS
(SHEET 2 OF 4)
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Copyright © Unpublished Work - See page 1 for details.
Original Issue: September 23, 2010
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50 of 55
BOEING SERVICE BULLETIN 747-25A3581
ALERTALERT

### Page 51

The step numbers shown below agree with the numbers shown in the circle symbols in the figure. The QTY
numbers shown below are the number of parts necessary for this figure.
MORE DATAQTYIDENTIFICATIONNAMETASKSTEP
(c) To the drip shield
assy (STA 340)
-672U7102-1DRIP SHIELD - FWD
BRACKET
Bond1
(c) To the drip shield
assy (STA 400).
-672U7102-2DRIP SHIELD - AFT
BRACKET
Bond2
(a) (c)1672U7102-6DRIP SHIELD - DE-
FLECTOR
Install (New)3
(b) (c)1672U7102-13DRIP SHIELD - DE-
FLECTOR PLATE
Install (New)4
FIGURE 6: ELECTRONICS EQUIPMENT CENTER - INSTALLATION OF DRIP SHIELD DEFLECTORS
(SHEET 3 OF 4)
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Copyright © Unpublished Work - See page 1 for details.
Original Issue: September 23, 2010
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BOEING SERVICE BULLETIN 747-25A3581
ALERTALERT

### Page 52

MORE DATAQTYIDENTIFICATIONNAMETASKSTEP
(b) (c)4672U7102-12DRIP SHIELD - DE-
FLECTOR PLATE
Install (New)5
(d)1672U7102-14DRIP SHIELD - DE-
FLECTOR
Install (New)6
(a) Bond to the inside face of aft edge of drip shield gutter. Bond flanges of the deflector shield to the STA
400 bulkhead using BMS 5-92. Refer to SOPM 20-50-12, Type 70 as an accepted procedure. The Deflector
Shield needs to be bonded at least 0.125" below the existing row of hi-locks, located at WL 186.29; this
dimension is required to ensure that these fasteners can be inspected.
(b) Bond on top of the deflector shield to bridge gaps inside the vertical stiffeners. Bond deflector plates to
STA 400 bulkhead as required using BMS 5-92. Refer to SOPM 20-50-12, Type 70 as an accepted pro-
cedure.
(c) Apply Sealant BMS 5-95. Fill all gaps between STA 400 Bulkhead and deflector shield, gaps between
deflector shield and deflector plates, gaps between deflector plates and STA 400 Bulkhead, and gaps
between deflector shield and drip shield to prevent water leaks. Refer to SOPM 20-15-19 as an accepted
procedure.
(d) Apply Sealant BMS 5-95. Fill all gaps between STA 340 Bulkhead and deflector shield. Refer to SOPM
20-15-19 as an accepted procedure.
FIGURE 6: ELECTRONICS EQUIPMENT CENTER - INSTALLATION OF DRIP SHIELD DEFLECTORS
(SHEET 4 OF 4)
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Copyright © Unpublished Work - See page 1 for details.
Original Issue: September 23, 2010
747-25A3581Revision 1 June 30, 2011
52 of 55
BOEING SERVICE BULLETIN 747-25A3581
ALERTALERT

### Page 53 (OCR)

BOEING SERVICE BULLETIN 747-25A3581
ALERT  ALERT
STA
400
STA
380
STA
360
STA
2057005
FIGURE 7: INSULATION BLANKET REPLACEMENT
(SHEET 1 OF 3)
Original Issue: September 23, 2010
Revision 1 June 30, 2011  BOEING PROPRIETARY -  747-25A3581
Copyright © Unpublished Work - See page 1 for details.  53 of 55

### Page 54 (OCR)

BOEING SERVICE BULLETIN 747-25A3581
ALERT  ALERT
2057006
The step numbers shown below agree with the numbers shown in the circle symbols in the figure. The QTY
numbers shown below are the number of parts necessary for this figure.
FIGURE 7: INSULATION BLANKET REPLACEMENT
(SHEET 2 OF 3)
Original Issue: September 23, 2010
Revision 1 June 30, 2011  BOEING PROPRIETARY -  747-25A3581
Copyright © Unpublished Work - See page 1 for details.  54 of 55

### Page 55

MORE DATAQTYIDENTIFICATIONNAMETASKSTEP
Refer to 747-400
AMM 25-52-04 as
an accepted proce-
dure
1411U4403-1031BLANKET ASSY - IN-
SULATION
Remove1
Refer to 747-400
AMM 25-52-04 as
an accepted proce-
dure
1411U4403-1001BLANKET ASSY - IN-
SULATION
Install (New)
FIGURE 7: INSULATION BLANKET REPLACEMENT
(SHEET 3 OF 3)
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Copyright © Unpublished Work - See page 1 for details.
Original Issue: September 23, 2010
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55 of 55
BOEING SERVICE BULLETIN 747-25A3581
ALERTALERT

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