# Boeing Alert Service Bulletin 777-52A0050: Revision 1

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- Document: [Boeing Alert Service Bulletin 777-52A0050](https://openairdocs.org/service-documents/boeing/777-52a0050.md)
- Title as filed: U.S. DOT/FAA - Service Bulletin-777-52A0050-00
- Pages: 30
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## Text

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### Page 1

Commercial 
Airplanes
777
Service Bulletin
ALERT
Number: 777-52A0050
Original Issue: June 18, 2013
ATA System: 5211
SUBJECT: DOORS - Passenger Entry Doors - Girt Bar Floor Fitting - Spring Pin Replacement
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 © 2013 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Unpublished Work.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, KC-46, KDC-10, MD-10, MD-11, MD-80, MD-88, MD-90, P-8, 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.
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3.0

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Table of Contents
Summary ...................................................... 5
1. PLANNING INFORMATION ........................................ 9
A. Effectivity ................................................ 9
1. Airplanes ............................................. 9
2. Spares Affected ........................................ 1 4
B. Concurrent Requirements ...................................... 1 4
C. Reason ................................................ 1 5
D. Description .............................................. 1 5
E. Compliance .............................................. 1 6
F. Approval ............................................... 1 6
G. Manpower .............................................. 1 6
H. Weight and Balance Changes .................................... 1 7
I. Electrical Load Data ......................................... 1 7
J. References .............................................. 1 7
1. Existing Data: ......................................... 1 7
2. Data Supplied with this Service Bulletin: ........................... 1 7
3. Installation Drawings Used in the Preparation of this Service Bulletin: ........... 1 7
K. Publications Affected ........................................ 1 8
L. Interchangeability and Intermixability of Parts ........................... 1 8
M. Software Accomplishment Summary ................................ 1 8
2. MATERIAL INFORMATION ........................................ 1 9
A. Material - Price and Availability ................................... 1 9
B. Industry Support Information .................................... 1 9
C. Parts Necessary for Each Airplane ................................. 1 9
1. Kits/Parts ............................................ 1 9
2. Parts and Materials Supplied by the Operator ........................ 2 0
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 1
F. Special Tooling Necessary to do this Service Bulletin ....................... 2 1
3. ACCOMPLISHMENT INSTRUCTIONS .................................. 2 3
A. GENERAL INFORMATION ..................................... 2 3
B. WORK INSTRUCTIONS ....................................... 2 4
FIGURE 1: PASSENGER ENTRY DOOR - GIRT BAR FLOOR FITTING - SPRING PIN REPLACEMENT
[Group 1] ............................................ 2 5
FIGURE 2: PASSENGER ENTRY DOOR - GIRT BAR FLOOR FITTING - SPRING PIN REPLACEMENT
[Group 2] ............................................ 2 8
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Commercial 
Airplanes
777
Service Bulletin
ALERT
SummaryNumber: 777-52A0050Original Issue: June 18, 2013
ATA System: 5211
SUBJECT: DOORS - Passenger Entry Doors - Girt Bar Floor Fitting - Spring Pin Replacement
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 gives instructions to replace the existing girt bar floor fitting spring pins at the passenger
entry doors with new spring pins that have improved resistance to stress corrosion cracking. If the work given
in this service bulletin is not done, the existing girt bar floor fitting spring pins could develop stress corrosion
cracks and eventually migrate or break. Broken or migrated girt bar floor fitting spring pins could prevent one or
more passenger entry door escape slides from deploying properly during an emergency. If escape slides do not
deploy properly during an emergency, delayed evacuation and serious injury to cabin occupants could occur.
Four operators have reported a total of 23 corroded, migrated, or broken girt bar floor fitting spring pins on nine
different airplanes. One of the operators reported that a broken girt bar floor fitting spring pin prevented a door
escape slide from deploying during a maintenance test.
Boeing has completed analysis on three broken spring pins and has determined that the spring pins failed due
to stress corrosion cracking.
Accomplishment of this service bulletin will ensure that the girt bar floor fitting spring pins are free of stress
corrosion cracking that could prevent proper escape slide deployment during an emergency. The new spring
pin material has demonstrated sufficient service life when used in similar applications on other Boeing model
airplanes.
Boeing Fleet Team Digest (FTD) article 777 FTD 52-12002 is related to this service bulletin.
Boeing Service Related Problem (SRP) 777-SRP-52-0102 is related to this service bulletin.
This table is provided to operators for planning purposes only. Refer to the applicable sections for more
information.
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ReferenceAffectedPlanning Data
Paragraph 1.A.2., Spares AffectedYesSpares Affected
Paragraph 1.E., Compliance and Paragraph
1.F., Approval
YesAD Related
Paragraph 1.H., Weight and Balance ChangesNoWeight and Balance Change
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/PartsYesKits/Parts Required
Paragraph 2.C.2., Parts and Materials Supplied
by the Operator
NoOperator Supplied Parts/Material
Paragraph 2.F., Special Tooling Necessary to
do this Service Bulletin
NoSpecial Tooling Required
ACTION (PRR 62777-90S)
At each of the passenger entry doors on the airplane, remove the girt bar floor fitting spring pins. Install new girt
bar floor fitting spring pins that have improved resistance to stress corrosion cracking. Accomplish all actions in
accordance with Paragraph 1.E., Compliance.
EFFECTIVITY
777-200, 777-200LR, 777-300, 777-300ER, and 777F 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.
Refer to Paragraph 1.E., Compliance.
INDUSTRY SUPPORT INFORMATION
Boeing warranty remedies are available for airplanes in warranty as of March 14, 2012. Please refer to Paragraph
2.B., Industry Support Information. The warranty remedies will expire eight years from the original issue date of
this service bulletin.
MANPOWER
Elapsed HoursTotal Task HoursAirplanes
2.5010.00Group 1
1.252.50Group 2
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BOEING SERVICE BULLETIN 777-52A0050
ALERT  ALERT
MATERIAL INFORMATION
Boeing Supplied Kits/Parts.
Refer to Paragraph 2.A., Material - Price and Availability.
AT EACH PASSENGER ENTRY DOOR
ON THE AIRPLANE, REPLACE THE
SPRING PINS IN THE GIRT BAR FLOOR
FITTINGS WITH NEW PINS THAT HAVE
IMPROVED RESISTANCE TO STRESS
CORROSION CRACKING.
GIRT BAR
FLOOR
, FITTINGS
SPRING~  PAWL
PASSENGER ENTRY DOOR
DOOR 1 LEFT SHOWN
ALL OTHER PASSENGER ENTRY
DOORS SIMILAR
SPRING PIN  2238968
GIRT BAR
FLOOR FITTING
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Commercial 
Airplanes
777
Service Bulletin
ALERT
Number: 777-52A0050
Original Issue: June 18, 2013
ATA System: 5211
SUBJECT: DOORS - Passenger Entry Doors - Girt Bar Floor Fitting - Spring Pin Replacement
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 D624W001 Part 3 for Airplane Variable Number, Line Number, and
Serial Number data.
This service bulletin is for the airplane(s) shown below. An equivalent change is on subsequent
production airplanes. Refer to PRR 62777-90S for data about this change.
DESCRIPTIONCONFIGURATIONGROUP
777-200, 777-200LR, 777-300, and 777-300ER airplanes, line
numbers 1 through 1134.
-1
777F airplanes, line numbers 1 through 1134.-2
Airplane Models:
777-200, 777-200LR, 777-300, 777-300ER, 777F
GroupVariable Number
1WA001 - WA017
1WA076 - WA080
1WA086 - WA093
1WA101 - WA104
1WA116 - WA119
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GroupVariable Number
1WA131 - WA137
1WA171 - WA175
1WA196 - WA198
1WA206 - WA212
1WA221 - WA223
1WA231 - WA232
1WA241 - WA250
1WA261 - WA266
1WA281 - WA283
1WA301 - WA304
1WB001 - WB021
1WB031 - WB046
1WB051 - WB088
1WB101 - WB106
1WB121 - WB125
1WB131 - WB148
1WB151 - WB155
1WB161 - WB177
1WB181 - WB194
1WB201 - WB215
1WB231 - WB247
1WB271 - WB273
1WB276 - WB286
1WB291 - WB302
1WB306 - WB307
1WB311 - WB337
1WB341 - WB342
1WB366 - WB368
1WB371 - WB388
1WB406
1WB411 - WB413
1WB416 - WB439
1WB446 - WB453
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GroupVariable Number
1WB476
1WB481 - WB484
1WB501 - WB512
1WB531 - WB537
1WB551 - WB554
1WB591 - WB597
1WB601 - WB606
1WB611 - WB622
1WB631 - WB638
1WB646 - WB649
1WC051 - WC073
1WC101 - WC104
1WC111 - WC120
1WC221 - WC224
1WC241 - WC243
1WC281 - WC290
1WC301 - WC308
1WC361 - WC364
1WC371 - WC374
1WC381 - WC395
1WC441
1WC446 - WC449
1WC456 - WC459
1WC486 - WC493
1WC506 - WC508
1WC521 - WC522
1WC531 - WC536
1WC546 - WC548
1WC556
1WC566 - WC567
1WC571 - WC574
1WC581
1WC586 - WC587
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GroupVariable Number
1WC591 - WC595
1WD001 - WD002
1WD011 - WD018
1WD031 - WD036
1WD046 - WD055
1WD066 - WD075
1WD081 - WD089
1WD091
1WD096
1WD101 - WD106
1WD111
1WD116 - WD117
1WD501 - WD513
1WD521 - WD541
1WD546 - WD554
1WD561 - WD573
1WD581 - WD599
1WD606 - WD609
1WD621 - WD632
1WD651 - WD665
1WD671 - WD677
1WD691 - WD709
1WD741 - WD752
1WD761 - WD771
1WD786 - WD788
1WD796 - WD821
1WD826 - WD837
1WD846 - WD867
1WD871 - WD892
1WD911 - WD918
1WD921 - WD929
1WD936 - WD957
1WD966 - WD970
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GroupVariable Number
1WD981 - WD982
1WD986 - WD987
1WD991 - WD993
1WD996
1WE001 - WE004
1WE011 - WE012
1WE021 - WE026
1WE031 - WE034
1WE051 - WE055
1WE071 - WE072
1WE081 - WE084
1WE091 - WE094
1WE126 - WE137
1WE141 - WE142
1WE151 - WE166
1WE176 - WE177
1WE186 - WE209
1WE216 - WE217
1WE226 - WE231
1WE236 - WE243
1WE251 - WE253
1WE261 - WE265
1WE271 - WE277
1WE291
1WE301 - WE309
1WE331 - WE334
1WE351 - WE352
1WE416 - WE417
2WF001 - WF004
2WF016 - WF023
2WF031 - WF038
2WF046 - WF065
2WF075 - WF077
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GroupVariable Number
2WF081 - WF088
2WF096 - WF101
2WF106 - WF109
2WF111 - WF115
2WF121 - WF124
2WF131 - WF133
2WF136 - WF138
2WF146 - WF147
2WF151 - WF152
2. Spares Affected
Examine your spares supply for the parts or components identified below. If any parts or components
are found, refer to Paragraph 3.B., Work Instructions for the recommended action.
Part Number
MS39086-261
MS16562-252
131W1830-1107
131W1830-1108
131W1830-1109
131W1830-1110
131W1830-1111
131W1830-1112
131W1830-1113
131W1830-1114
131W1830-1115
131W1830-1116
131W1830-1117
131W1830-1118
B. Concurrent Requirements
None.
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C. Reason
This service bulletin gives instructions to replace the existing girt bar floor fitting spring pins at the
passenger entry doors with new spring pins that have improved resistance to stress corrosion cracking.
If the work given in this service bulletin is not done, the existing girt bar floor fitting spring pins could
develop stress corrosion cracks and eventually migrate or break. Broken or migrated girt bar floor fitting
spring pins could prevent one or more passenger entry door escape slides from deploying properly
during an emergency. If escape slides do not deploy properly during an emergency, delayed evacuation
and serious injury to cabin occupants could occur.
Four operators have reported a total of 23 corroded, migrated, or broken girt bar floor fitting spring pins
on nine different airplanes. One of the operators reported that a broken girt bar floor fitting spring pin
prevented a door escape slide from deploying during a maintenance test.
Boeing has completed analysis on three broken spring pins and has determined that the spring pins
failed due to stress corrosion cracking.
Accomplishment of this service bulletin will ensure that the girt bar floor fitting spring pins are free of
stress corrosion cracking that could prevent proper escape slide deployment during an emergency.
The new spring pin material has demonstrated sufficient service life when used in similar applications
on other Boeing model airplanes.
Boeing Fleet Team Digest (FTD) article 777 FTD 52-12002 is related to this service bulletin.
Boeing Service Related Problem (SRP) 777-SRP-52-0102 is related to this service bulletin.
D. Description
At each of the passenger entry doors on the airplane, remove the girt bar floor fitting spring pins. Install
new girt bar floor fitting spring pins that have improved resistance to stress corrosion cracking.
Accomplish all actions in accordance with Paragraph 1.E., Compliance.
The work in this service bulletin is done in the maintenance zones given below.
The work in this service bulletin is done in the maintenance zone(s) given below.
Group 1:
Affected Maintenance Zones
ZoneModel
831, 832, 834, 835, 841, 842, 844, 845777-200, 777-200LR, 777-300,
777-300ER
Group 2:
Affected Maintenance Zones
ZoneModel
831, 841777F
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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.
Do the required actions in accordance with Paragraph 3. Accomplishment Instructions.
Table 1: Passenger Entry Door - Girt Bar Floor Fitting - Spring Pin Replacement
Compliance TimeActionCondition
Within 1175 days after the Original
Issue date of this service bulletin.
At each passenger entry door loca-
tion, replace the spring pin at both
girt bar floor fittings in accordance
with Paragraph 3.B., Work Instruc-
tions. (a)
All airplanes.
(a) Accomplishment of spring pin replacement at all girt bar floor fitting locations is terminating action for 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 passenger
entry door location. 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.
Group 1:
Elapsed HoursTask HoursNumber of PersonsTask
2.5010.004Figure 1
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Group 1:
Elapsed HoursTask HoursNumber of PersonsTask
2.5010.00TOTAL FOR EACH AIRPLANE
Group 2:
Elapsed HoursTask HoursNumber of PersonsTask
1.252.502Figure 2
1.252.50TOTAL 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 62777-90S
b. Boeing Service Related Problem (SRP) 777-SRP-52-0102
c. Service Bulletin Index D624W001
d. Standard Overhaul Practices Manual (SOPM) 20-50-01
e. 777 Aircraft Maintenance Manual (AMM) 52-11-00, 52-11-18
f. 777 Fleet Team Digest (FTD) 52-12002
2. Data Supplied with this Service Bulletin:
None.
3. Installation Drawings Used in the Preparation of this Service Bulletin:
TitleDrawing Number
Emergency System Installation - Passenger Entry Doors131W1800
The table above lists applicable drawings used to prepare this service bulletin. The drawings are
not necessary to make the specified changes, and are not supplied with this service bulletin. The
drawings may not be applicable to all airplane configurations or operators.
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K. Publications Affected
1. Publications:
Chapter-SectionPublication
52-11777 Illustrated Parts Catalog
52-12-80Component Maintenance Manual
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
Refer to Paragraph 2.C., Parts Necessary for Each Airplane, for interchangeability and intermixability
information.
M. Software Accomplishment Summary
Not affected.
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2.    MATERIAL INFORMATION
A. Material - Price and Availability
Boeing can supply the parts shown in Paragraph 2.C., Parts Necessary for Each Airplane. Operators
are encouraged to share schedule requirements with Boeing for incorporation of the service bulletin.
The parts are subject to the terms and conditions of the Boeing standard purchase order
acknowledgment. Prices are in United States Dollars. Terms: Net 30 days.
Reference this service bulletin and submit your purchase order by one of these methods:
1. Order on-line via ATA Spec 2000 or The Boeing PART Page
2. Fax to (206) 662-7145
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 as of
the Original Issue
date of this Ser-
vice Bulletin (US
Dollars)
ROLT as of the
Original Issue
date of this Ser-
vice Bulletin (Cal-
endar Days)
QTYDateNamePart Number
0.971411500(a)Spring PinBACP18BE16N1000U
(a) Boeing expects replacement spring pins to be available immediately after release of the Original Issue of
this service bulletin.
B. Industry Support Information
Boeing warranty remedies are available for 777 airplanes in warranty as of March 14, 2012. For task
hour reimbursement for airplanes in warranty as of that date, send a warranty claim to Boeing Warranty
& Product Assurance Contracts. The parts for airplanes in warranty as of that date will be supplied at
no charge. Send a purchase order for the parts to Boeing Material Management. Please refer to this
service bulletin number and reference the airplane variable number(s) in your purchase order. The
warranty remedies will expire eight years from the original issue date of this service bulletin.
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: The parts shown below and the items shown in Paragraph 2.C.2., Parts and Materials
Supplied by the Operator, are necessary for each passenger entry door location on the
airplane.
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NotesExisting Part
Number
NameQTYNew Part Number
(a) (b)
(c) (d)
MS39086-261
or
Spring Pin2BACP18BE16N1000U
MS16562-252
(a) The quantity shown is the quantity required to make the change at each pas-
senger entry door.
(b) Discard the existing part.
(c) The new part is used in production. The new part is required to terminate the
required actions in this service bulletin.
(d) You cannot use the existing part to replace the new or changed part.
2. Parts and Materials Supplied by the Operator
The following parts or materials are necessary to do the change in this service bulletin. Parts and
materials in the manuals given in Paragraph 1.J., References, can also be necessary. Examine
operator part and material supply to make sure all necessary parts and materials are available.
NotesNameQTYPart Number /
Specification
(a)Grease1
ounce
BMS 3-33
(a) Refer to the Qualified Products List at the end of the Boeing Material Specification (BMS)
for supplier data.
3. Parts Modified and Reidentified
NotesNew Part NumberNameQTYExisting Part
Number
(b) (c)-Passenger Entry Door
- Girt Bar Mechanism -
Floor Fitting Assy
2 (a)131W1830-( )
(a) Two parts are changed at each passenger entry door location.
(b) Make the change in accordance with this service bulletin.
(c) There is no equivalent Boeing part number for the changed part. Identify on the part that
the change done in accordance with this service bulletin was made.
4. Parts Removed and Not Replaced
None.
D. Parts Necessary to Change Spares
To get the parts shown below, refer to Paragraph 2.A., Material - Price and Availability.
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### Page 21

QTYNamePart Number
1 (a)Spring PinBACP18BE16N1000U
(a) One part is necessary for each 131W1830-( ) Passenger Entry Door -
Girt Bar Mechanism - Floor Fitting Assy found in operators inventory.
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 22

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### Page 23

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
– Angular tolerance is plus or minus 2 degrees
– 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. Refer to SOPM 20-50-01 for alternate
full threaded fasteners (screws) needed for installation in this service bulletin.
6. 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.
7. 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.
8. 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.
9. Shaded areas in Figures are to separate the non-critical and non-authoritative
information from the critical and authoritative information.
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### Page 24

10. The compliance times for the actions in Paragraph 3.B., WORK INSTRUCTIONS
are in Paragraph 1.E., Compliance.
B. WORK INSTRUCTIONS
1. Open each of the passenger entry doors. Refer to 777 AMM 52-11-00 as an accepted procedure.
2. Group 1:
At each passenger entry door location, replace the spring pin at both girt bar floor fittings in
accordance with FIGURE 1.
NOTE: Overwing exit doors on 777-300 and 777-300ER airplanes do not have girt bar floor
fittings and do not require the change given in this service bulletin.
3. Group 2:
At each passenger entry door location, replace the spring pin at both girt bar floor fittings in
accordance with FIGURE 2.
4. Do a check of the girt bar floor fittings and correct any discrepancies found. Refer to 777 AMM
52-11-18 as an accepted procedure.
5. Close each of the passenger entry doors. Refer to 777 AMM 52-11-00 as an accepted procedure.
6. Put the airplane back to a serviceable condition.
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### Page 25 (OCR)

BOEING SERVICE BULLETIN 777-52A0050
ALERT  ALERT
This Figure applies only to: Group 1.
GIRT BAR
FLOOR FITTING
FWD  PASSENGER ENTRY DOOR
DOOR 1 LEFT SHOWN
OTHER DOORS SIMILAR
FIGURE 1: PASSENGER ENTRY DOOR - GIRT BAR FLOOR FITTING - SPRING PIN REPLACEMENT
(SHEET 1 OF 3)
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### Page 26 (OCR)

BOEING SERVICE BULLETIN 777-52A0050
ALERT  ALERT
GIRT BAR FLOOR FITTING  PAWL
(FORWARD FITTING SHOWN,
AFT FITTING SIMILAR)
SPRING 12
SPRING PIN  2238922
FIGURE 1: PASSENGER ENTRY DOOR - GIRT BAR FLOOR FITTING - SPRING PIN REPLACEMENT
(SHEET 2 OF 3)
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### 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 each passenger entry door location.
More DataQtyIdentificationNameTaskStep
(a)1MS39086-261 OR
MS16562-252
Existing Spring PinRemove1
(a)1131W1832-( )PawlRemove / Keep
(a)1131W1836-( )SpringRemove / Keep
(a) (b) (c)1131W1836-( )SpringInstall (Kept)2
(a) (c)1131W1832-( )PawlInstall (Kept)
(a) (c)1BACP18BE16N1000USpring PinInstall (New)
(a) Do this step at each passenger entry door location and each girt bar floor fitting. For Group 1 airplanes,
a total quantity of 16 spring pins should be replaced on each airplane.
(b) Make sure the spring is oriented as shown. The two free legs of the spring should be nested inside the
pawl. The looped end of the spring should sit on the surface of the floor fitting.
(c) Apply BMS 3-33 grease to the hole of the pawl and the entire spring pin prior to installation of the spring
pin. After spring pin installation, apply a light coating of BMS 3-33 grease to all accessible areas of the
spring pin and the spring under the pawl.
FIGURE 1: PASSENGER ENTRY DOOR - GIRT BAR FLOOR FITTING - SPRING PIN REPLACEMENT
(SHEET 3 OF 3)
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### Page 28 (OCR)

BOEING SERVICE BULLETIN 777-52A0050
ALERT  ALERT
This Figure applies only to: Group 2.
GIRT BAR
FLOOR FITTING
PASSENGER ENTRY DOOR
DOOR 1 LEFT SHOWN
DOOR 1 RIGHT OPPOSITE
2238951
FIGURE 2: PASSENGER ENTRY DOOR - GIRT BAR FLOOR FITTING - SPRING PIN REPLACEMENT
(SHEET 1 OF 3)
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### Page 29 (OCR)

BOEING SERVICE BULLETIN 777-52A0050
ALERT  ALERT
GIRT BAR FLOOR FITTING  PAWL
(FORWARD FITTING SHOWN
AFT FITTING SIMILAR)
SPRING XZ
SPRING PIN  2238949
FIGURE 2: PASSENGER ENTRY DOOR - GIRT BAR FLOOR FITTING - SPRING PIN REPLACEMENT
(SHEET 2 OF 3)
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### Page 30

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 each passenger entry door girt bar floor fitting
location.
More DataQtyIdentificationNameTaskStep
(a)1MS39086-261 OR
MS16562-252
Existing Spring PinRemove1
(a)1131W1832-( )PawlRemove / Keep
(a)1131W1836-( )SpringRemove / Keep
(a) (b) (c)1131W1836-( )SpringInstall (Kept)2
(a) (c)1131W1832-( )PawlInstall (Kept)
(a) (c)1BACP18BE16N1000USpring PinInstall (New)
(a) Do this step at each passenger entry door location and each girt bar floor fitting. For Group 2 airplanes,
a total quantity of 4 spring pins should be replaced on each airplane.
(b) Make sure the spring is oriented as shown. The two free legs of the spring should be nested inside the
pawl. The looped end of the spring should sit on the surface of the floor fitting.
(c) Apply BMS 3-33 grease to the hole of the pawl and the entire spring pin prior to installation of the spring
pin. After spring pin installation, apply a light coating of BMS 3-33 grease to all accessible areas of the
spring pin and the spring under the pawl.
FIGURE 2: PASSENGER ENTRY DOOR - GIRT BAR FLOOR FITTING - SPRING PIN REPLACEMENT
(SHEET 3 OF 3)
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