# Boeing Alert Service Bulletin 747-25A3613: No revision named

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- Title as filed: U.S. DOT/FAA - SB-747-25A3613-00
- Pages: 39
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### Page 1

Commercial 
Airplanes
747
Service Bulletin
ALERT
Number: 747-25A3613
Original Issue: June 22, 2012
ATA System: 2551
SUBJECT: EQUIPMENT/FURNISHINGS - Electrical/Electronic Equipment Centers - Aft Main
Equipment Center (MEC) Drip Shield Gutter Repair
Export of this technology is controlled under the United States Export Administration Regulations (EAR) (15
CFR 300-774). 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 © 2012 Boeing.
Unpublished Work. All Rights Reserved.
Treatment of this document and its content is governed by contract with Boeing. Rights to use this document
are licensed on a per aircraft basis and such rights may not be transferable. For more information, contact The
Boeing Company.
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 Boeing
liveries 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. BOEING is a trademark of Boeing Management
Company.
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2.0

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Table of Contents
Summary ...................................................... 5
1. PLANNING INFORMATION ........................................ 9
A. Effectivity ................................................ 9
1. Airplanes ............................................. 9
2. Spares Affected ........................................ 1 3
B. Concurrent Requirements ...................................... 1 3
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 5
3. Installation Drawings Used in the Preparation of this Service Bulletin: ........... 1 5
K. Publications Affected ........................................ 1 5
L. Interchangeability and Intermixability of Parts ........................... 1 5
M. Software Accomplishment Summary ................................ 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 7
3. Parts Modified and Reidentified ................................ 1 7
4. Parts Removed and Not Replaced .............................. 1 7
D. Parts Necessary to Change Spares ................................. 1 7
E. Special Tooling - Price and Availability ............................... 1 8
F. Special Tooling Necessary to do this Service Bulletin ....................... 1 8
3. ACCOMPLISHMENT INSTRUCTIONS .................................. 1 9
A. GENERAL INFORMATION ..................................... 1 9
B. WORK INSTRUCTIONS ....................................... 2 0
FIGURE 1: CARGO LINER SUPPORT REMOVAL ............................ 2 1
FIGURE 2: AFT MEC DRIP SHIELD GUTTER CLEANING AND PREPARATION FOR GENERAL VISUAL
INSPECTION .......................................... 2 5
FIGURE 3: AFT MEC DRIP SHIELD GUTTER REPAIR ......................... 2 9
FIGURE 4: AFT MEC DRIP SHIELD GUTTER REINFORCEMENT ................... 3 2
FIGURE 5: CARGO LINER SUPPORT INSTALLATION ......................... 3 6
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Commercial 
Airplanes
747
Service Bulletin
ALERT
SummaryNumber: 747-25A3613Original Issue: June 22, 2012
ATA System: 2551
SUBJECT: EQUIPMENT/FURNISHINGS - Electrical/Electronic Equipment Centers - Aft Main
Equipment Center (MEC) Drip Shield Gutter Repair
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
None.
BACKGROUND
This service bulletin will reduce the possibility of water penetration into the main equipment center (MEC).
Disbonded aft MEC drip shield gutters have allowed water to drip past the MEC drip shield and into the Wire
Integration Units (WIU). Water penetration into the WIUs could result in loss of flight critical systems.
An operator experienced water leaking from main deck cargo into the WIU. It flowed from the drip shield through
disbonded floor seams into the aft MEC drip shield gutter, then onto the WIU
Liquids can leak through the MEC drip shield due to disbonded aft MEC drip shield gutters resulting in water
intrusion into the WIU of the MEC. Disbonding can occur due to improper preparation of the drip shield/gutter
material, aging of materials, and/or poor workmanship.
This Service Bulletin does a general visual inspection of the aft MEC drip shield gutters for disbonded seams,
and repairs them if necessary. A reinforcing layer of fiberglass is applied over the seam in the aft MEC drip
shield gutter to ensure no future disbondments occur.
Boeing Service Related Problem (SRP) 747-SRP-25-0304 is related to this service bulletin
This table is provided to operators for planning purposes only. Refer to the applicable sections for more
information.
ReferenceAffectedPlanning Data
Paragraph 1.A.2., Spares AffectedNoSpares Affected
Paragraph 1.E., ComplianceYesAD Related
Paragraph 1.H., Weight and Balance ChangesYesWeight and Balance Change
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ReferenceAffectedPlanning Data
Paragraph 1.I., Electrical Load DataNoElectrical Load Changed
Paragraph 1.K., Publications AffectedNoPublications Affected
Paragraph 1.K., Publications AffectedNoAirplane Flight Operations Affected (Flight Crew
Operations Manual and/or FAA Approved Air-
plane Flight Manual)
Paragraph 2.C.1., Kits/PartsNoKits/Parts Required
Paragraph 2.C.2., Parts and Materials Supplied
by the Operator
YesOperator Supplied Material
Paragraph 2.F., Special Tooling Necessary to
do this Service Bulletin
NoSpecial Tooling Required
ACTION (PRR 85901-117RS)
- Do a general visual inspection of the aft MEC drip shield gutters for disbonded seam, and repair if necessary.
- Add fiberglass reinforcement to aft MEC drip shield gutters.
EFFECTIVITY
747-400, 747-400D, 747-400F Airplanes. Refer to Paragraph 1.A.1., Airplanes, for the list of affected airplane(s).
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 inspection, change and/or repair given in this service bulletin be done within 24
months after the original issue date of this service bulletin.
INDUSTRY SUPPORT INFORMATION
Boeing warranty remedies are not available for the configuration changes, inspection, and/or repair procedures
given in this service bulletin.
MANPOWER
Elapsed HoursTotal Task HoursAirplanes
6.1510.65Group 1 air-
planes
MATERIAL INFORMATION
Operator Supplied Parts/Materials.
Refer to Paragraph 2.A., Material - Price and Availability.
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BOEING SERVICE BULLETIN 747-25A3613
ALERT  ALERT
STA
440
STA
460
- DO A GENERAL VISUAL INSPECTION
OF THE AFT MEC DRIP SHIELD
GUTTERS FOR DISBONDED SEAM,
AND REPAIR IF NECESSARY.
- ADD FIBERGLASS REINFORCEMENT  TO AFT MEC DRIP SHIELD GUTTERS.  00000  00000
2155129
Original Issue: June 22, 2012
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Commercial 
Airplanes
747
Service Bulletin
ALERT
Number: 747-25A3613
Original Issue: June 22, 2012
ATA System: 2551
SUBJECT: EQUIPMENT/FURNISHINGS - Electrical/Electronic Equipment Centers - Aft Main
Equipment Center (MEC) Drip Shield Gutter Repair
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 airplane(s) shown below. Refer to PRR 85901-117RS for data about
this change.
DESCRIPTIONCONFIGURATIONGROUP
747-400 passenger and freighter airplanes that have a two piece aft
MEC drip shield gutter
-1
Airplane Models:
747-400, 747-400D, 747-400F
GroupVariable Number
1RF001 - RF006
1RL401 - RL402
1RL411 - RL418
1RL651 - RL654
1RM001 - RM007
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GroupVariable Number
1RM010 - RM013
1RM021 - RM024
1RM026 - RM030
1RM036 - RM045
1RM051 - RM053
1RM071
1RM081 - RM084
1RM091
1RM096 - RM097
1RM116 - RM117
1RM126 - RM127
1RM129 - RM132
1RM136 - RM147
1RM156 - RM158
1RM166 - RM177
1RM191 - RM192
1RM231 - RM233
1RM241 - RM246
1RM261 - RM264
1RM316 - RM318
1RM331 - RM333
1RM341
1RM351 - RM355
1RM366 - RM367
1RM401 - RM403
1RM426
1RM431
1RM801 - RM803
1RM811 - RM813
1RM851 - RM858
1RM861
1RM871 - RM876
1RM881 - RM886
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GroupVariable Number
1RM891 - RM899
1RM901 - RM903
1RM911
1RR701
1RR721 - RR724
1RR746 - RR748
1RR851 - RR856
1RR861 - RR862
1RR951 - RR952
1RT001 - RT014
1RT034 - RT035
1RT041 - RT047
1RT073 - RT074
1RT101 - RT103
1RT121
1RT131 - RT137
1RT151 - RT152
1RT162 - RT163
1RT165 - RT168
1RT401 - RT412
1RT431 - RT447
1RT452 - RT455
1RT457 - RT460
1RT462 - RT469
1RT471 - RT499
1RT502 - RT505
1RT511 - RT512
1RT514 - RT515
1RT517
1RT521 - RT523
1RT525
1RT527
1RT529
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GroupVariable Number
1RT531 - RT535
1RT551 - RT568
1RT571
1RT580 - RT591
1RT601 - RT614
1RT616 - RT630
1RT633 - RT634
1RT636 - RT641
1RT643 - RT654
1RT672 - RT673
1RT681 - RT682
1RT691 - RT699
1RT701 - RT704
1RT711 - RT717
1RT741
1RT744 - RT750
1RT753 - RT757
1RT776 - RT777
1RT783 - RT784
1RT801 - RT803
1RT811 - RT814
1RT831 - RT835
1RT861 - RT864
1RT877 - RT880
1RT931 - RT932
1RT945 - RT949
1RT951 - RT955
1RT966
1RU002 - RU006
1RU016 - RU017
1RU031 - RU032
1RU051 - RU052
1RU059 - RU062
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GroupVariable Number
1RU081 - RU083
1RU101 - RU102
1RU121 - RU132
1RU803
1RU805
1RU808 - RU809
1RU831
1RU833 - RU841
2. Spares Affected
None.
B. Concurrent Requirements
None.
C. Reason
This service bulletin will reduce the possibility of water penetration into the main equipment center
(MEC). Disbonded aft MEC drip shield gutters have allowed water to drip past the MEC drip shield and
into the Wire Integration Units (WIU). Water penetration into the WIUs could result in loss of flight critical
systems.
An operator experienced water leaking from main deck cargo into the WIU. It flowed from the drip shield
through disbonded floor seams into the aft MEC drip shield gutter, then onto the WIU
Liquids can leak through the MEC drip shield due to disbonded aft MEC drip shield gutters resulting in
water intrusion into the WIU of the MEC. Disbonding can occur due to improper preparation of the drip
shield/gutter material, aging of materials, and/or poor workmanship.
This Service Bulletin does a general visual inspection of the aft MEC drip shield gutters for disbonded
seams, and repairs them if necessary. A reinforcing layer of fiberglass is applied over the seam in the
aft MEC drip shield gutter to ensure no future disbondments occur.
Boeing Service Related Problem (SRP) 747-SRP-25-0304 is related to this service bulletin
D. Description
- Do a general visual inspection of the aft MEC drip shield gutters for disbonded seam, and repair if
necessary.
- Add fiberglass reinforcement to aft MEC drip shield gutters.
The work in this service bulletin is done in the maintenance zone(s) given below.
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Affected Maintenance Zones
ZoneModel
117, 118747-400, 747-400D, 747-400F
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 inspection, change and/or repair given in this service bulletin be done
within 24 months after the original 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
2.254.502Figure 1
0.750.751Figure 2
0.05 (a)0.05 (a)1Figure 3
0.400.401Figure 4
2.254.502Figure 5
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Elapsed HoursTask HoursNumber of PersonsTask
0.250.251Close Access
6.1510.65TOTAL FOR EACH AIRPLANE
H. Weight and Balance Changes
None.
I. Electrical Load Data
Not changed.
J. References
1. Existing Data:
a. Engineering Change Memo PRR 85901-117RS
b. Boeing Service Related Problem (SRP) 747-SRP-25-0304
c. Service Bulletin Index D6-30300
d. Standard Overhaul Practices Manual (SOPM) 20-30-03, 20-50-12
e. 747-400 Structural Repair Manual (SRM) 51-70-06
2. Data Supplied with this Service Bulletin:
None.
3. Installation Drawings Used in the Preparation of this Service Bulletin:
None.
K. Publications Affected
1. Publications:
None.
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 does not affect FCS, therefore DTIs are not necessary.
L. Interchangeability and Intermixability of Parts
Accomplishment of this service bulletin does not affect interchangeability or intermixability of parts.
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M. Software Accomplishment Summary
Not affected.
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2.    MATERIAL INFORMATION
A. Material - Price and Availability
The operator can supply the parts and materials shown in Paragraph 2.C., Parts Necessary for Each
Airplane. As an alternative, operators can purchase the parts from Boeing Spares. This service bulletin
does not show the Boeing price and supply data.
B. Industry Support Information
Boeing warranty remedies are not available for the configuration changes, inspection, and/or repair
procedures given in this service bulletin.
C. Parts Necessary for Each Airplane
1. Kits/Parts
None.
2. Parts and Materials Supplied by the Operator
NotesNameQTYPart Number /
Specification
(a)ADHESIVE1 QtBMS 5-92, Any
Type
(a)SEALANT1 QtBMS 5-95, Type I,
Class B
(a)FIBERGLASS CLOTH1 RollBMS 9-3, Type H,
H-2, or H-3, Class
7
(a)EPOXY RESIN1 QtBMS 8-201, Type
III or Type IV
RIVET48NAS1398D5-5
(a) Refer to the Qualified Products List at the end of the Boeing Material Specification (BMS)
for supplier data.
3. Parts Modified and Reidentified
None.
4. Parts Removed and Not Replaced
None.
D. Parts Necessary to Change Spares
None.
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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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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. Manual titles are referred to by acronyms. Refer to Paragraph 1.J., References, for
definition of the acronyms.
2. Obey all of the warnings and cautions given in the specified manual sections.
3. 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
– Hole dimensions for standard solid rivets and fasteners are in Structural Repair
Manual (SRM) Chapter 51
– Torque limits to tighten nuts and bolts are in SRM Chapter 51
4. Use the approved fastener and process material substitutions in accordance with
SRM Chapter 51.
5. If the length of any fastener specified in this service bulletin does not meet installation
standards given in SRM Chapter 51, then a fastener of the same specification, or
an approved substitute, with a length which meets the installation standards given
in SRM Chapter 51 may be used. In addition, washers may be installed for fastener
grip length in accordance with SRM Chapter 51.
6. A General Visual Inspection is defined as: A visual examination of an interior or
exterior area, installation or assembly to detect obvious damage, failure or irregularity.
This level of inspection is made from within touching distance unless otherwise
specified. A mirror may be necessary to enhance visual access to all exposed surfaces
in the inspection area. This level of inspection is made under normally available
lighting conditions such as daylight, hangar lighting, flashlight or drop-light and may
require removal or opening of access panels or doors. Stands, ladders or platforms
may be required to gain proximity to the area being checked.
7. 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.
8. If it is necessary to remove more parts for access, you can remove those parts. If
you can get access without removing identified parts, it is not necessary to remove
all of the identified parts. Jacking and shoring limitations must be observed.
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9. Where the work instructions include installation of a kept part, a new or serviceable
part with the same part number can be installed as an alternative to the kept part.
10. Shaded areas in Figures are reference only. Shaded areas in Figures may look
different than your airplane.
B. WORK INSTRUCTIONS
1. Remove cargo liner support in accordance with Figure 1.
2. Clean the aft MEC drip shield gutter and do a general visual inspection for seam disbondment in
accordance with Figure 2.
a. If any seam disbondment is found, repair seam in accordance with Figure 3.
b. If no seam disbondment is found, proceed to step 3.
3. Install aft MEC drip shield gutter reinforcement in accordance with Figure 4.
4. Install cargo liner support in accordance with Figure 5.
5. Put the airplane back to a serviceable condition.
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BOEING SERVICE BULLETIN 747-25A3613
ALERT  ALERT
STA
440
STA
460
OR
00000  200000  2154754
FIGURE 1: CARGO LINER SUPPORT REMOVAL
(SHEET 1 OF 4)
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Export Controlled ECCN: 9E991 - BOEING  747-25A3613
PROPRIETARY - Copyright © Unpublished
Work - See page 1 for details.  21 of 39

### Page 22

FIGURE 1: CARGO LINER SUPPORT REMOVAL
(SHEET 2 OF 4)
Export Controlled ECCN: 9E991 - BOEING
PROPRIETARY - Copyright © Unpublished
Work - See page 1 for details.
Original Issue: June 22, 2012
747-25A3613
22 of 39
BOEING SERVICE BULLETIN 747-25A3613
ALERTALERT

### Page 23 (OCR)

BOEING SERVICE BULLETIN 747-25A3613
ALERT  ALERT
LBL RBL
3
LBI
49
5) 15 LOCATIONS
(15) 24 LOCATIONS
LBL
96
4 LOCATIONS (11
RBL  RBL
RBL  49  (13) 24 LOCATIONS  96
13) 15 LOCATIONS
FWD
OPTIONAL INSTALLATION
2157028
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: CARGO LINER SUPPORT REMOVAL
(SHEET 3 OF 4)
Original Issue: June 22, 2012
PROPRIETARY - Copyright © Unpublished  Export Controlled ECCN: 9E991 - BOEING  747-25A3613
Work - See page 1 for details.  23 of 39

### Page 24

More DataQtyIdentificationNameTaskStep
4-FASTENERSRemove / Keep1
1-SPLICE PLATERemove / Keep2
4-FASTENERSRemove / Keep3
1-SPLICE PLATERemove / Keep4
4-FASTENERSRemove / Keep5
1-SPLICE PLATERemove / Keep6
15-FASTENERSRemove / Keep7
1-LINER SUPPORT AS-
SY
Remove / Keep8
15-FASTENERSRemove / Keep9
1-LINER SUPPORT AS-
SY
Remove / Keep10
4-FASTENERSRemove / Keep11
1-SPLICE PLATERemove / Keep12
39-FASTENERSRemove / Keep13
1-LINER SUPPORT AS-
SY
Remove / Keep14
39-FASTENERSRemove / Keep15
1-LINER SUPPORT AS-
SY
Remove / Keep16
FIGURE 1: CARGO LINER SUPPORT REMOVAL
(SHEET 4 OF 4)
Export Controlled ECCN: 9E991 - BOEING
PROPRIETARY - Copyright © Unpublished
Work - See page 1 for details.
Original Issue: June 22, 2012
747-25A3613
24 of 39
BOEING SERVICE BULLETIN 747-25A3613
ALERTALERT

### Page 25 (OCR)

BOEING SERVICE BULLETIN 747-25A3613C
ALERT  ALERT
STA
440
STA
460
AND
00000  200000  2154763
FIGURE 2: AFT MEC DRIP SHIELD GUTTER CLEANING AND PREPARATION FOR GENERAL VISUAL
INSPECTION
(SHEET 1 OF 4)
Original Issue: June 22, 2012
Export Controlled ECCN: 9E991 - BOEING  747-25A3613
PROPRIETARY - Copyright © Unpublished
Work - See page 1 for details.  25 of 39

### Page 26 (OCR)

BOEING SERVICE BULLETIN 747-25A3613
ALERT  ALERT
STA
440
STA
460  MEC DRIP
SHIELD
A.
MEC DRIP
SHIELD
AFT MEC
DRIP SHIELD
GUTTER
AFT MEC
DRIP SHIELD
GUTTER
AFT MEC
GUTTER  DRIP SHIELD  STA  460  MEC DRIP SHIELD  STA  440
SEAM  FWD
A-A  2154850
FIGURE 2: AFT MEC DRIP SHIELD GUTTER CLEANING AND PREPARATION FOR GENERAL VISUAL
INSPECTION
(SHEET 2 OF 4)
Original Issue: June 22, 2012
PROPRIETARY - Copyright © Unpublished  Export Controlled ECCN: 9E991 - BOEING  747-25A3613
Work - See page 1 for details.  26 of 39

### Page 27

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
Solvent clean, refer
to SOPM 20-30-03
as an accepted pro-
cedure.(a)
--MEC DRIP SHIELDClean1
Carefully remove
any loose old adhe-
sive without causing
further damage to
MEC drip shield.(a)
-BMS 5-92ADHESIVERemove2
FIGURE 2: AFT MEC DRIP SHIELD GUTTER CLEANING AND PREPARATION FOR GENERAL VISUAL
INSPECTION
(SHEET 3 OF 4)
Export Controlled ECCN: 9E991 - BOEING
PROPRIETARY - Copyright © Unpublished
Work - See page 1 for details.
Original Issue: June 22, 2012
747-25A3613
27 of 39
BOEING SERVICE BULLETIN 747-25A3613
ALERTALERT

### Page 28

More DataQtyIdentificationNameTaskStep
Solvent clean, refer
to SOPM 20-30-03
as an accepted pro-
cedure.(a)
--MEC DRIP SHIELDClean3
Abrasive clean, refer
to SOPM 20-30-03
as an accepted pro-
cedure.(a)
--MEC DRIP SHIELDClean4
Solvent clean, refer
to SOPM 20-30-03
as an accepted pro-
cedure.(a)
--MEC DRIP SHIELDClean5
Do a general visual
inspection of the aft
MEC drip shield gut-
ters for disbonded
seams.
--MEC DRIP SHIELDInspect6
(a) Cleaning and preparation of the aft MEC drip shield gutters should extend a minimum 2" on either side
of the seams.
FIGURE 2: AFT MEC DRIP SHIELD GUTTER CLEANING AND PREPARATION FOR GENERAL VISUAL
INSPECTION
(SHEET 4 OF 4)
Export Controlled ECCN: 9E991 - BOEING
PROPRIETARY - Copyright © Unpublished
Work - See page 1 for details.
Original Issue: June 22, 2012
747-25A3613
28 of 39
BOEING SERVICE BULLETIN 747-25A3613
ALERTALERT

### Page 29 (OCR)

BOEING SERVICE BULLETIN 747-25A3613
ALERT  ALERT
STA
440
STA
460
00000  200000  2154978
FIGURE 3: AFT MEC DRIP SHIELD GUTTER REPAIR
(SHEET 1 OF 3)
Original Issue: June 22, 2012
PROPRIETARY - Copyright © Unpublished  Export Controlled ECCN: 9E991 - BOEING  747-25A3613
Work - See page 1 for details.  29 of 39

### Page 30 (OCR)

BOEING SERVICE BULLETIN 747-25A3613
ALERT  ALERT
STA
440
STA
460
MEC DRIP SHIELD
MEC DRIP SHIELD
AFT MEC
DRIP SHIELD
GUTTER
AFT MEC
DRIP SHIELD
GUTTER
AFT MEC
DRIP SHIELD  GUTTER  STA  460  MEC DRIP SHIELD  STA  440
SEAM  FWD
A-A  2154977
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: AFT MEC DRIP SHIELD GUTTER REPAIR
(SHEET 2 OF 3)
Original Issue: June 22, 2012
Export Controlled ECCN: 9E991 - BOEING  PROPRIETARY - Copyright © Unpublished  747-25A3613
Work - See page 1 for details.  30 of 39

### Page 31

More DataQtyIdentificationNameTaskStep
Bond the aft MEC
drip shield gutter
seam using BMS 5-
92. Refer to SOPM
20-50-12, Type 70
as an accepted pro-
cedure.
-BMS 5-92ADHESIVEApply1
FIGURE 3: AFT MEC DRIP SHIELD GUTTER REPAIR
(SHEET 3 OF 3)
Export Controlled ECCN: 9E991 - BOEING
PROPRIETARY - Copyright © Unpublished
Work - See page 1 for details.
Original Issue: June 22, 2012
747-25A3613
31 of 39
BOEING SERVICE BULLETIN 747-25A3613
ALERTALERT

### Page 32 (OCR)

BOEING SERVICE BULLETIN 747-25A3613
ALERT  ALERT
STA
440
STA
460
AND
00000  100000  2155347
FIGURE 4: AFT MEC DRIP SHIELD GUTTER REINFORCEMENT
(SHEET 1 OF 4)
Original Issue: June 22, 2012
Export Controlled ECCN: 9E991 - BOEING  PROPRIETARY - Copyright © Unpublished  747-25A3613
Work - See page 1 for details.  32 of 39

### Page 33 (OCR)

BOEING SERVICE BULLETIN 747-25A3613
ALERT  ALERT
STA
440
STA
460  / MEC DRIP SHIELD
/ MEC DRIP SHIELD
AFT MEC
DRIP SHIELD
GUTTER
AFT MEC
DRIP SHIELD
GUTTER
AFT MEC
DRIP SHIELD  GUTTER  STA  460  MEC DRIP SHIELD  STA  440
OVERLAP SEAM WITH
FIBERGLASS CLOTH BY
1.00 MINIMUM
FWD
FIBERGLASS  OVERLAP SEAM
CLOTH  WITH FIBERGLASS
CLOTH BY 0.40  0.60  2155469
A-A
FIGURE 4: AFT MEC DRIP SHIELD GUTTER REINFORCEMENT
(SHEET 2 OF 4)
Original Issue: June 22, 2012
PROPRIETARY - Copyright © Unpublished  Export Controlled ECCN: 9E991 - BOEING  747-25A3613
Work - See page 1 for details.  33 of 39

### Page 34

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
(a)-BMS 9-3, TYPE H, H-2,
OR H-3, CLASS 7
FIBERGLASS CLOTHCut1
(b)-BMS 8-201EPOXY RESINPrepare2
FIGURE 4: AFT MEC DRIP SHIELD GUTTER REINFORCEMENT
(SHEET 3 OF 4)
Export Controlled ECCN: 9E991 - BOEING
PROPRIETARY - Copyright © Unpublished
Work - See page 1 for details.
Original Issue: June 22, 2012
747-25A3613
34 of 39
BOEING SERVICE BULLETIN 747-25A3613
ALERTALERT

### Page 35

More DataQtyIdentificationNameTaskStep
(c)-BMS 9-3, TYPE H, H-2,
OR H-3, CLASS 7
FIBERGLASS CLOTHInstall (New)3
Bond using BMS 8-
201, Type III or Type
IV. Refer to 747-400
SRM 51-70-06 as an
accepted procedure.
Vacuum bagging is
not required.
-BMS 8-201EPOXY RESINApply
(a) Cut fiberglass cloth to overlay the aft MEC drip shield gutter seam in sections as required. Two plies will
be required. All sections of fiberglass cloth shall overlap 2 inch minimum.
(b) Prepare epoxy resin in sufficient quantity. Work in small batches consistent with working life of resin.
Apply mixed epoxy resin and fiberglass cloth using squeegee or similar tool.
(c) Install the prepared BMS 9-3 fiberglass impregnated fabric to the underside of the bonded seams. Place
edge of impregnated fabric 0.40-0.60 inch forward from edge of re-bonded seam and extend upward and
aft over seam gutter.
FIGURE 4: AFT MEC DRIP SHIELD GUTTER REINFORCEMENT
(SHEET 4 OF 4)
Export Controlled ECCN: 9E991 - BOEING
PROPRIETARY - Copyright © Unpublished
Work - See page 1 for details.
Original Issue: June 22, 2012
747-25A3613
35 of 39
BOEING SERVICE BULLETIN 747-25A3613
ALERTALERT

### Page 36 (OCR)

BOEING SERVICE BULLETIN 747-25A3613
ALERT  ALERT
STA
440
STA
460
OR
0000  00000  2155349
FIGURE 5: CARGO LINER SUPPORT INSTALLATION
(SHEET 1 OF 4)
Original Issue: June 22, 2012
Export Controlled ECCN: 9E991 - BOEING  PROPRIETARY - Copyright © Unpublished  747-25A3613
Work - See page 1 for details.  36 of 39

### Page 37

FIGURE 5: CARGO LINER SUPPORT INSTALLATION
(SHEET 2 OF 4)
Export Controlled ECCN: 9E991 - BOEING
PROPRIETARY - Copyright © Unpublished
Work - See page 1 for details.
Original Issue: June 22, 2012
747-25A3613
37 of 39
BOEING SERVICE BULLETIN 747-25A3613
ALERTALERT

### Page 38 (OCR)

BOEING SERVICE BULLETIN 747-25A3613
ALERT  ALERT
LBL RBL  3
LBL
49
) 15 LOCATIONS
(16) 24 LOCATIONS
LBL
96
4 LOCATIONS (18
RBL  49  15) 24 LOCATIONS  RBL  96
RBL
14) 15 LOCATIONS
FWD
OPTIONAL INSTALLATION
2157071
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: CARGO LINER SUPPORT INSTALLATION
(SHEET 3 OF 4)
Original Issue: June 22, 2012
Export Controlled ECCN: 9E991 - BOEING  PROPRIETARY - Copyright © Unpublished  747-25A3613
Work - See page 1 for details.  38 of 39

### Page 39

More DataQtyIdentificationNameTaskStep
1-LINER SUPPORT AS-
SY
Install (Kept)1
15-FASTENERSInstall (Kept)2
1-LINER SUPPORT AS-
SY
Install (Kept)3
15-FASTENERSInstall (Kept)4
1-SPLICE PLATEInstall (Kept)5
4-FASTENERSInstall (Kept)6
1-SPLICE PLATEInstall (Kept)7
4-FASTENERSInstall (Kept)8
1-SPLICE PLATEInstall (Kept)9
4-FASTENERSInstall (Kept)10
1-LINER SUPPORT AS-
SY
Install (Kept)11
15-FASTENERSInstall (Kept)12
1-LINER SUPPORT AS-
SY
Install (Kept)13
15-FASTENERSInstall (Kept)14
24NAS1398D5-5RIVETInstall (New)15
24NAS1398D5-5RIVETInstall (New)16
1-SPLICE PLATEInstall (Kept)17
4-FASTENERSInstall (Kept)18
FIGURE 5: CARGO LINER SUPPORT INSTALLATION
(SHEET 4 OF 4)
Export Controlled ECCN: 9E991 - BOEING
PROPRIETARY - Copyright © Unpublished
Work - See page 1 for details.
Original Issue: June 22, 2012
747-25A3613
39 of 39
BOEING SERVICE BULLETIN 747-25A3613
ALERTALERT

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