# Boeing Alert Service Bulletin 737-52A1180: No revision named

- Rights: © The Boeing Company. Filed by the FAA in regulations.gov docket FAA-2020-0459, the docket of AD 2021-01-04. Not covered by OpenAirDocs’ CC0 dedication.
- Document: [Boeing Alert Service Bulletin 737-52A1180](https://openairdocs.org/service-documents/boeing/737-52a1180.md)
- Title as filed: 737-52A1180-00--RB
- Pages: 27
- PDF: https://openairdocs.org/files/sha256/35/9b/359b3dc3168c26cadab15bfacac685f7c510e438cb27b3bf8250a0d04d186d12
- Page: https://openairdocs.org/service-documents/boeing/737-52a1180/file/359b3dc3168c

## Text

Some pages are OCR from a scan. OCR can misread letters and numbers. Each page's text from the PDF; open the PDF at a page with #page=N.

### Page 1

Commercial 
Airplanes
737
Requirements Bulletin
ALERT
Number: 737-52A1180 RB
Original Issue: January 24, 2020
ATA System: 5211
SUBJECT: DOORS - Forward Entry Door - Stop Fitting Assembly Inspection
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:
Copyright © 2020 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Unpublished Work.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.
Original Issue: January 24, 2020
737-52A1180 RB
1 of 27
4.0

### Page 2

Export Controlled ECCN: 9E991
Copyright © Unpublished
Work - See page 1 for details.
Original Issue: January 24, 2020
737-52A1180 RB
2 of 27
REQUIREMENTS BULLETIN 737-52A1180
ALERTALERT
BLANK PAGE

### Page 3

Table of Contents
1. EFFECTIVITY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
A. Airplanes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
B. Spares Affected . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2. CONCURRENT REQUIREMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3. COMPLIANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
4. APPROVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5. ACCOMPLISHMENT INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
A. General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
B. Work Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
FIGURE 1: FORWARD ENTRY DOOR - STOP FITTING ASSEMBLY - INSPECTION . . . . . . . . . 14
FIGURE 2: FORWARD ENTRY DOOR - STOP FITTING ASSEMBLY - MEASUREMENT . . . . . . . 16
FIGURE 3: FORWARD ENTRY DOOR - STOP FITTING ASSEMBLY - REMOVAL . . . . . . . . . . 18
FIGURE 4: FORWARD ENTRY DOOR - UPPER BEAM - MODIFICATION . . . . . . . . . . . . . . . 20
FIGURE 5: FORWARD ENTRY DOOR - STOP FITTING ASSEMBLY - INSTALLATION . . . . . . . 23
Export Controlled ECCN: 9E991
Copyright © Unpublished
Work - See page 1 for details.
Original Issue: January 24, 2020
737-52A1180 RB
3 of 27
REQUIREMENTS BULLETIN 737-52A1180
ALERTALERT

### Page 4

Export Controlled ECCN: 9E991
Copyright © Unpublished
Work - See page 1 for details.
Original Issue: January 24, 2020
737-52A1180 RB
4 of 27
REQUIREMENTS BULLETIN 737-52A1180
ALERTALERT
BLANK PAGE

### Page 5

Commercial 
Airplanes
737
Requirements Bulletin
ALERT
Number: 737-52A1180 RB
Original Issue: January 24, 2020
ATA System: 5211
SUBJECT: DOORS - Forward Entry Door - Stop Fitting Assembly Inspection
THIS DOCUMENT 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 DOCUMENT
TO THE NEW OPERATOR. IF APPLICABLE SPARES HAVE BEEN SOLD, SEND THIS DOCUMENT TO THE
NEW OWNER. THIS IS AN ENHANCED REQUIRED FOR COMPLIANCE DOCUMENT. THE BOEING
PROCESSES USED TO CREATE THE SERVICE BULLETIN (SB) AND THE REQUIREMENTS BULLETIN
(RB) ENSURE THAT THE INFORMATION BETWEEN "RC START" AND "RC END" IN THE SB ARE IDENTICAL
TO THE INFORMATION IN THE SAME SECTIONS (COMPLIANCE, WORK INSTRUCTIONS…) OF THE RB
WHICH THE SB REFERS TO AS THE RELATED DOCUMENT.
1. Effectivity
A. Airplanes
This bulletin is applicable to 737-600, 737-700, 737-700C, 737-800, 737-900 Airplane(s), line
number(s) 1-1075 in 1 Group(s). Where the effectivity is presented with hyphens between line
numbers, the airplane applicability means "through" and "inclusive", e.g. line numbers 1-9 means
line numbers 1 through 9 inclusive.
DESCRIPTIONCONFIGURATIONGROUP
737-600/-700/-700C/-800/-900 Airplanes.-1
Airplane Models:
737-600, 737-700, 737-700C, 737-800, 737-900
GroupVariable Number
1YA001 - YA099
1YA101 - YA118
1YA201 - YA210
1YA231 - YA242
1YA251 - YA256
1YA271 - YA272
GroupVariable Number
1YA291
1YA301 - YA302
1YA311 - YA314
1YA321 - YA323
1YA336 - YA340
1YA351
GroupVariable Number
1YA356
1YA366
1YA501 - YA536
1YA541 - YA551
1YA571 - YA578
1YA601 - YA615
Export Controlled ECCN: 9E991
Copyright © Unpublished
Work - See page 1 for details.
Original Issue: January 24, 2020
737-52A1180 RB
5 of 27

### Page 6

GroupVariable Number
1YA621 - YA622
1YA626 - YA629
1YA635
1YA645 - YA647
1YA656 - YA657
1YA681 - YA690
1YA701 - YA706
1YA721 - YA722
1YA731 - YA734
1YA751 - YA756
1YA801 - YA803
1YA809
1YA811 - YA814
1YA831 - YA834
1YA841 - YA856
1YA881 - YA882
1YA891 - YA892
1YA961 - YA966
1YB001 - YB006
1YB101 - YB112
1YB151 - YB153
1YB161 - YB162
1YB171 - YB172
1YB181 - YB183
1YB201 - YB205
1YB271
1YB276
1YB301 - YB305
1YB501 - YB502
1YB521
1YC001 - YC028
1YC051 - YC082
1YC101 - YC104
GroupVariable Number
1YC111 - YC113
1YC121
1YC126 - YC127
1YC136 - YC141
1YC146 - YC147
1YC151 - YC156
1YC166 - YC167
1YC171
1YC301 - YC303
1YC321 - YC382
1YC391 - YC392
1YC396
1YC401 - YC414
1YC416 - YC417
1YC421
1YC426
1YC441 - YC448
1YC451 - YC455
1YC459
1YC461 - YC467
1YC471 - YC490
1YC501 - YC525
1YC571 - YC581
1YC587 - YC589
1YC591 - YC593
1YC601 - YC654
1YC681 - YC696
1YC701 - YC715
1YC720 - YC725
1YC727 - YC738
1YC751 - YC752
1YC761 - YC770
1YC781 - YC793
GroupVariable Number
1YC801 - YC882
1YC901 - YC907
1YC931 - YC932
1YC941 - YC948
1YC971 - YC976
1YC981 - YC983
1YD001 - YD005
1YD021 - YD025
1YD041 - YD054
1YD081 - YD084
1YD101 - YD107
1YD121 - YD126
1YD151 - YD153
1YD171 - YD172
1YD201 - YD203
1YD206 - YD207
1YD251
1YD301 - YD316
1YD401 - YD408
1YD501 - YD506
1YD531 - YD534
1YD541 - YD542
1YD601 - YD611
1YE001 - YE020
1YE051
1YE101 - YE109
1YE151 - YE157
1YE171 - YE172
1YE201 - YE203
1YG001 - YG042
1YG061 - YG064
1YG066 - YG083
1YG501 - YG505
Export Controlled ECCN: 9E991
Copyright © Unpublished
Work - See page 1 for details.
Original Issue: January 24, 2020
737-52A1180 RB
6 of 27
REQUIREMENTS BULLETIN 737-52A1180
ALERTALERT

### Page 7

GroupVariable Number
1YG601 - YG602
GroupVariable Number
1YJ471
GroupVariable Number
1YJ501 - YJ514
B. Spares Affected
Examine your spares supply for the parts or components identified below. If any parts or components
are found, refer to the Work Instructions for the recommended action.
Part Number
141A6150-1
141A6150-2
141A6100 - 678
2. CONCURRENT REQUIREMENTS
None.
3. COMPLIANCE
The Federal Aviation Administration (FAA) will possibly release an Airworthiness Directive related to
Requirements Bulletin 737-52A1180 RB. The Airworthiness Directive will make the compliance tasks and
times given in the Requirements Bulletin 737-52A1180 RB mandatory.
For airplanes which have incorporated Boeing Business Jet (BBJ) Lower Cabin Altitude Supplemental Type
Certificate (STC) ST01697SE (6500 feet maximum cabin altitude in lieu of 8000 feet) as referenced in
Boeing SB 737-21-1149, the flight cycle related compliance times are different from those specified in this
bulletin. All initial compliance times (thresholds) specified in flight cycles must be reduced to half of those
specified in this bulletin. All repeat interval compliance times specified in flight cycles must be reduced to
one-quarter of those specified in this bulletin.
Accomplish the required actions, based on the applicable conditions in Table 1, in accordance with the
Accomplishment Instructions.
When more than one OPTION is given for a CONDITION, do only one of the OPTION numbers. When
more than one ACTION is given for a CONDITION or an OPTION, do all of the ACTION numbers for that
CONDITION or OPTION.
Export Controlled ECCN: 9E991
Copyright © Unpublished
Work - See page 1 for details.
Original Issue: January 24, 2020
737-52A1180 RB
7 of 27
REQUIREMENTS BULLETIN 737-52A1180
ALERTALERT

### Page 8

Table 1: Forward Entry Door Number 7 Stop Fitting Assembly Inspection
Repeat Interval
(Not to Exceed)
Compliance Time (Whichever
Occurs Later)
ActionCondition
-Within 5,000 for-
ward entry door
flight cycles after
the Original Is-
sue date of Re-
quirements Bul-
letin 737-
52A1180 RB.
Before 10,000
total flight cycles
on the forward
entry door.
OPTION 1:
Do a review of mainte-
nance records of the
upper aft corner door
stop fitting assembly to
determine part number.
(a)
All Airplanes
OPTION 2:
Do an inspection of the
upper aft corner door
stop fitting assembly to
determine part number.
OPTION 3:
Do measurement of the
stop fitting lug outer di-
ameter to determine
part number.
-Within 5,000 for-
ward entry door
flight cycles after
the Original Is-
sue date of Re-
quirements Bul-
letin 737-
52A1180 RB.
Before 10,000
total flight cycles
on the forward
entry door.
Replace with Part
Number 141A6104-21.
CONDITION 1:
PART NUMBER
141A6104-3
FOUND
---No further action is re-
quired.
CONDITION 2:
PART NUMBER
141A6104-3 IS
NOT FOUND
(a) A review of the maintenance or delivery records can be used if the part number of the installed
aft corner door stop fitting assembly can be positively determined.
4. APPROVAL
Note: The approval statement that follows is valid for all affected airplanes, except 737-700C airplanes.
This Requirements Bulletin was examined by the Federal Aviation Administration (FAA). The changes
specified in this document 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 document and its approval were based on the airplane
in its original Boeing delivery configuration or as modified by other Boeing changes.
Export Controlled ECCN: 9E991
Copyright © Unpublished
Work - See page 1 for details.
Original Issue: January 24, 2020
737-52A1180 RB
8 of 27
REQUIREMENTS BULLETIN 737-52A1180
ALERTALERT

### Page 9

If an airplane has a non-Boeing modification or repair that affects a component or system also affected by
this Requirements Bulletin, the operator is responsible for obtaining appropriate regulatory agency approval
before incorporating this Requirements Bulletin.
Note: The approval statement that follows is valid for 737-700C airplanes only.
This Requirements Bulletin was examined by the Federal Aviation Administration (FAA). The changes
specified in this document comply with the applicable regulations and are FAA approved for airplanes listed
in the service bulletin effectivity. This document and its approval were based on the airplane in its original
Boeing delivery configuration or as modified by other Boeing changes.
If an airplane has a non-Boeing modification or repair that affects a component or system also affected by
this Requirements Bulletin, the operator is responsible for obtaining appropriate regulatory agency approval
before incorporating this Requirements Bulletin.
Export Controlled ECCN: 9E991
Copyright © Unpublished
Work - See page 1 for details.
Original Issue: January 24, 2020
737-52A1180 RB
9 of 27
REQUIREMENTS BULLETIN 737-52A1180
ALERTALERT

### Page 10

Export Controlled ECCN: 9E991
Copyright © Unpublished
Work - See page 1 for details.
Original Issue: January 24, 2020
737-52A1180 RB
10 of 27
REQUIREMENTS BULLETIN 737-52A1180
ALERTALERT
BLANK PAGE

### Page 11

5.    ACCOMPLISHMENT INSTRUCTIONS
A. GENERAL INFORMATION
NOTE: 1. This is an Enhanced Required for Compliance document. There will be a separate
Service Bulletin (SB) and a separate Requirements Bulletin (RB). If an RB is mandated
by an Airworthiness Directive (AD), then all applicable requirements specified in the
RB must be done. For the related SB, some locations are marked RC Start and RC
End to identify the requirements that are restated from the RB. For the related SB,
the areas between RC Start and RC End, including sub-steps and any figures
identified between RC Start and RC End, must be done to comply with the AD.
Therefore, an Alternative Method of Compliance (AMOC) is required for any deviations
to steps between RC Start and RC End, including substeps and identified figures.
For the related SB, the steps not between RC Start and RC End may be deviated
from using accepted methods in accordance with the operator's maintenance or
inspection program without obtaining approval of an AMOC; this is provided that the
steps between RC Start and RC End, including sub-steps and identified figures, can
still be done as specified, and the airplane can be put back in an airworthy condition.
Figures not required for compliance are omitted from the RB.
2. This is an Enhanced Required for Compliance document. The Boeing processes
used to create the Service Bulletin (SB) and the Requirements Bulletin (RB) ensure
that the information between "RC Start" and "RC End" in the SB are identical to the
information in the same sections (Compliance, Work Instructions...) of the RB which
the SB refers to as the related document.
3. The compliance times for the actions in WORK INSTRUCTIONS are in Compliance.
4. Boeing Service Letter 737-SL-51-042, Damage Reporting and Repair Plan/Design
Guidelines, is an acceptable procedure to request information from Boeing for
additional structural repair instructions. The Service Letter describes what information
must be provided to Boeing before a structural repair can be provided.
5. 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 Values:
— Values for structural fasteners are given in 737 Structural Repair Manual,
Chapter 51.
— Non-standard torque values for maintenance tasks are included in the
applicable installation step.
Export Controlled ECCN: 9E991
Copyright © Unpublished
Work - See page 1 for details.
Original Issue: January 24, 2020
737-52A1180 RB
11 of 27
REQUIREMENTS BULLETIN 737-52A1180
ALERTALERT

### Page 12

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. 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.
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.
9. Use the approved fastener, process and material substitutions in accordance with
SRM Chapter 51.
10. When more than one OPTION is given for a CONDITION, do only one of the OPTION
numbers. When more than one ACTION is given for a CONDITION or an OPTION,
do all of the ACTION numbers for that CONDITION or OPTION.
11. 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.
B. WORK INSTRUCTIONS
Actions Required for Compliance:
1. Requirements:
Export Controlled ECCN: 9E991
Copyright © Unpublished
Work - See page 1 for details.
Original Issue: January 24, 2020
737-52A1180 RB
12 of 27
REQUIREMENTS BULLETIN 737-52A1180
ALERTALERT

### Page 13

Table 1: Forward Entry Door Number 7 Stop Fitting Assembly Inspection
Refer to the listed procedures in
SB 747-52A1180 Original Issue or
later approved revisions as an
accepted procedure
Method of Compli-
ance
ActionCondition
--OPTION 1:All Airplanes
Do a review of mainte-
nance records of the up-
per aft corner door stop
fitting assembly to deter-
mine part number.
DO PART 1:--
GET ACCESS
-FIGURE 1OPTION 2:
Do an inspection of the
upper aft corner door
stop fitting assembly to
determine part number.
DO PART 1:-
GET ACCESS
-FIGURE 2OPTION 3:
Do measurement of the
stop fitting lug outer diam-
eter to determine part
number.
DO PART 2:-Replace with Part Num-
ber 141A6104-21.
CONDITION 1:
PART NUMBER
141A6104-3 IS
FOUND
PREPARATION
-FIGURE 3
-FIGURE 4
-FIGURE 5
DO PART 3:-
RESTORATION
--No further action is re-
quired.
CONDITION 2:
PART NUMBER
141A6104-3 IS NOT
FOUND
Export Controlled ECCN: 9E991
Copyright © Unpublished
Work - See page 1 for details.
Original Issue: January 24, 2020
737-52A1180 RB
13 of 27
REQUIREMENTS BULLETIN 737-52A1180
ALERTALERT

### Page 14 (OCR)

REQUIREMENTS BULLETIN 737-52A1180
ALERT  ALERT
DOOR LINING
ESCAPE SLIDE
PACK AND COVER
FORWARD
ENTRY DOOR
NUMBER 7
STOP FITTING
ASSEMBLY
DOOR LINING AND INNER
FWD  SKIN ARE NOT SHOWN
2860838
FIGURE 1: FORWARD ENTRY DOOR - STOP FITTING ASSEMBLY - INSPECTION
(SHEET 1 OF 2)
Original Issue: January 24, 2020
Export Controlled ECCN: 9E991  737-52A1180 RB
Copyright © Unpublished
Work - See page 1 for details.  14 of 27

### Page 15

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
-1-STOP FITTING ASSYInspect1
FIGURE 1: FORWARD ENTRY DOOR - STOP FITTING ASSEMBLY - INSPECTION
(SHEET 2 OF 2)
Export Controlled ECCN: 9E991
Copyright © Unpublished
Work - See page 1 for details.
Original Issue: January 24, 2020
737-52A1180 RB
15 of 27
REQUIREMENTS BULLETIN 737-52A1180
ALERTALERT

### Page 16 (OCR)

REQUIREMENTS BULLETIN 737-52A1180
ALERT  ALERT
DOOR LINING
ESCAPE SLIDE
PACK AND COVER
FORWARD
ENTRY DOOR
1) STOP FITTING
LUG
LUG
DIAMETER
NUMBER 7
STOP FITTING
FITTING  STOP  ASSEMBLY  FWD
ASSEMBLY
A-A  DOOR LINING AND INNER  SKIN ARE NOT SHOWN
FIGURE 2: FORWARD ENTRY DOOR - STOP FITTING ASSEMBLY - MEASUREMENT
(SHEET 1 OF 2)
Original issue: January 24, 2020
Export Controlled ECCN: 9E991
Copyright © Unpublished
Work - See page 1 for details.  16 of 27

### Page 17

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)1-STOP FITTING ASSYMeasure1
(a) Measure the diameter of the forward entry door stop fitting lug for part number identification. Part number
141A6104-3 stop fitting lug has a measurement less than 0.95 inch diameter (reference: 0.78 TO 0.82
inch lug diameter typical).
FIGURE 2: FORWARD ENTRY DOOR - STOP FITTING ASSEMBLY - MEASUREMENT
(SHEET 2 OF 2)
Export Controlled ECCN: 9E991
Copyright © Unpublished
Work - See page 1 for details.
Original Issue: January 24, 2020
737-52A1180 RB
17 of 27
REQUIREMENTS BULLETIN 737-52A1180
ALERTALERT

### Page 18 (OCR)

REQUIREMENTS BULLETIN 737-52A1180
ALERT  ALERT
FORWARD  UPPER GATE
ENTRY DOOR
FWD
FORWARD ENTRY DOOR
(DOOR LINING AND ESCAPE SLIDE REMOVED)
NUMBER 7
STOP FITTING
ASSEMBLY
INNER SKIN  2918253
FIGURE 3: FORWARD ENTRY DOOR - STOP FITTING ASSEMBLY - REMOVAL
(SHEET 1 OF 2)
Original Issue: January 24, 2020
Export Controlled ECCN: 9E991  737-52A1180 RB
Copyright © Unpublished
Work - See page 1 for details.  18 of 27

### Page 19

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
-1141A6104-3STOP FITTING ASSYRemove1
Keep the fastener
common to the
Hinge.
1141A6187-1RADIUS FILLERRemove / Keep
Keep the fastener
common to the
Hinge.
1141A6187-2RADIUS FILLERRemove / Keep
FIGURE 3: FORWARD ENTRY DOOR - STOP FITTING ASSEMBLY - REMOVAL
(SHEET 2 OF 2)
Export Controlled ECCN: 9E991
Copyright © Unpublished
Work - See page 1 for details.
Original Issue: January 24, 2020
737-52A1180 RB
19 of 27
REQUIREMENTS BULLETIN 737-52A1180
ALERTALERT

### Page 20 (OCR)

REQUIREMENTS BULLETIN 737-52A1180
ALERT  ALERT
FORWARD
ENTRY DOOR
UPPER BEAM
FRAME  END
UPPER SECTION OF
FORWARD ENTRY DOOR
(UPPER GATE REMOVED)
•
UPPER
BEAM
45 UPPER BEAM
2 3 4 NUMBER 7
STOP FITTING
(4) FRAME  ASSEMBLY
2860984
FIGURE 4: FORWARD ENTRY DOOR - UPPER BEAM - MODIFICATION
(SHEET 1 OF 3)
Original issue: January 24, 2020
Export Controlled ECCN: 9E991
Copyright © Unpublished
Work - See page 1 for details.  LE TO OZ

### Page 21 (OCR)

REQUIREMENTS BULLETIN 737-52A1180
ALERT  ALERT
UPPER
BEAM
0.89
O.  .27
0.014-→
FWD
UPPER BEAM
2918480
FIGURE 4: FORWARD ENTRY DOOR - UPPER BEAM - MODIFICATION
(SHEET 2 OF 3)
Original Issue: January 24, 2020
Export Controlled ECCN: 9E991  737-52A1180 RB
Copyright © Unpublished
Work - See page 1 for details.  21 of 27

### Page 22

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)1141A6121-13UPPER BEAMCut1
(b)1141A6121-13UPPER BEAMInspect
(c)1141A6104-21STOP FITTING ASSY
- FWD ENTRY DOOR
Put / Hold2
(d)(h)-141A6104-21STOP FITTING ASSY
- FWD ENTRY DOOR
Drill3
(e)-TYPE II, CLASS ASEALANTApply4
(f)-BMS 10-11, TYPE IPRIMERApply
(g)1-PART MARKApply5
(a) Trim the upper beam to the dimensions as shown. Maintain a 2D edge margin and break all sharp edges.
(b) Do a High Frequency Eddy Current or Dye Penetrant inspection of the cut area for damage in accordance
with 737-600/700/800/900 SRM 51-10-04. Refer to 737-600/700/800/900 SRM 52-10-02 for allowable
damage limits. For damage outside of allowable limits, contact the Boeing company for repair instructions
and do the repair.
(c) Make sure the upper beam does not make contact with the radius of the stop fitting assembly.
(d) Match drill holes from the upper beam first and then the frame into the stop fitting assembly. Take care
not to oversize the fastener holes and break all sharp edges. Refer to 737-600/700/800/900 SRM 51-30-
01 as an accepted procedure.
(e) Manually apply chemical conversion coating. Refer to SOPM 20-43-03 as an accepted procedure.
(f) Apply two coats of primer. Refer to SOPM 20-41-02 as an accepted procedure.
(g) On existing 141A6121-13 Upper Beam, apply part mark with new part number 141A6121-18 using the
rubber stamp method. Refer to SOPM 20-50-10 as an accepted procedure. Refer to Paragraph 2.C.3.,
Parts Modified and Reidentified.
(h) Hole preparation, refer to SOPM 20-10-02 as an accepted procedure.
FIGURE 4: FORWARD ENTRY DOOR - UPPER BEAM - MODIFICATION
(SHEET 3 OF 3)
Export Controlled ECCN: 9E991
Copyright © Unpublished
Work - See page 1 for details.
Original Issue: January 24, 2020
737-52A1180 RB
22 of 27
REQUIREMENTS BULLETIN 737-52A1180
ALERTALERT

### Page 23 (OCR)

REQUIREMENTS BULLETIN 737-52A1180
ALERT  ALERT
FORWARD
ENTRY DOOR
_ UPPER GATE
UPPER
INNER SKIN
FWD
FORWARD ENTRY DOOR
(DOOR LINING AND ESCAPE SLIDE REMOVED)
FIGURE 5: FORWARD ENTRY DOOR - STOP FITTING ASSEMBLY - INSTALLATION
(SHEET 1 OF 5)
Original Issue: January 24, 2020
Export Controlled ECCN: 9E991  737-52A1180 RB
Copyright © Unpublished
Work - See page 1 for details.  23 of 27

### Page 24 (OCR)

REQUIREMENTS BULLETIN 737-52A1180
ALERT  ALERT
UPPER GATE
NUMBER 7
STOP FITTING
ASSEMBLY
188-8
FRAME
FWD  UPPER
BEAM
UPPER
BEAM
FRAME ASSEMBLY AND GATE
2918248
FIGURE 5: FORWARD ENTRY DOOR - STOP FITTING ASSEMBLY - INSTALLATION
(SHEET 2 OF 5)
Original Issue: January 24, 2020
Export Controlled ECCN: 9E991  Copyright © Unpublished  737-52A1180 RB
Work - See page 1 for details.  24 of 27

### Page 25 (OCR)

REQUIREMENTS BULLETIN 737-52A1180
ALERT  ALERT
AȚ A
NUMBER 7
STOP FITTING
ASSEMBLY
0.190
0.170
UPPER BEAM  FWD
A-A
(7 LOCATIONS)
2918251
FIGURE 5: FORWARD ENTRY DOOR - STOP FITTING ASSEMBLY - INSTALLATION
(SHEET 3 OF 5)
Original Issue: January 24, 2020
Export Controlled ECCN: 9E991  737-52A1180 RB
Copyright © Unpublished
Work - See page 1 for details.  25 of 27

### Page 26

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)(b)1141A6104-21STOP FITTING ASSY
- FWD ENTRY DOOR
Locate1
Refer to fastener
code table.
1141A6104-21STOP FITTING ASSY
- FWD ENTRY DOOR
Drill
(c)(d)
Refer to fastener
code table.
1141A6104-21STOP FITTING ASSY
- FWD ENTRY DOOR
Install (New)
(e)(f)
(a) Locate stop fitting to beam with direct contact.
(b) Locate stop fitting to frame with direct contact.
(c) Before drilling holes in the new stop fitting verify location of stop pin alignment to stop pad per rigging re-
quirement, of 0.20 target diameter located 0.115 aft of pad center. Refer to 737-600/700/800/900 AMM
52-11-00 as an accepted procedure.
(d) Break all sharp edges.
(e) Apply BMS 5-95 between mating surfaces. Refer to SOPM 20-50-19 as an accepted procedure.
(f) Install fasteners through beam, frame and stop fitting.
The codes shown below agree with the letter shown in the upper left corner of the fastener symbols in the figure.
A number in the lower right corner gives the grip length of the fastener. The QTY numbers shown below are the
number of fasteners necessary for this figure.
More DataHole DiaQtyIdentificationNameCode
(b)(c)(d)(a)-BACB30MY6K(*)HI-LOKA
(c)(a)-BACC30M6COLLAR
FIGURE 5: FORWARD ENTRY DOOR - STOP FITTING ASSEMBLY - INSTALLATION
(SHEET 4 OF 5)
Export Controlled ECCN: 9E991
Copyright © Unpublished
Work - See page 1 for details.
Original Issue: January 24, 2020
737-52A1180 RB
26 of 27
REQUIREMENTS BULLETIN 737-52A1180
ALERTALERT

### Page 27

More DataHole DiaQtyIdentificationNameCode
Install flush +0.000-0.005(a)-BACB30NW6K6HI-LOKB
(b)(c)(d)
Install flush +0.000-0.005(a)-BACC30M6COLLAR
(c)
(c)(d)0.190-0.196
(No.11)
-BACR15GF6D7RIVET, 100 DEGC
(a) For hole diameter sizes and oversizing holes refer to 737-600/700/800/900 SRM 51-40-05 as an accepted
procedure.
(b) Install fasteners wet with BMS 5-95. Refer to SOPM 20-50-19 as an accepted procedure.
(c) Grip length may vary at some locations, use the grip length necessary for the correct installation. Refer
to refer to 737-600/700/800/900 SRM 51-40-02 as an accepted procedure.
(d) To remove or install fasteners, refer to 737-600/700/800/900 SRM 51-40-02 as an accepted procedure.
FIGURE 5: FORWARD ENTRY DOOR - STOP FITTING ASSEMBLY - INSTALLATION
(SHEET 5 OF 5)
Export Controlled ECCN: 9E991
Copyright © Unpublished
Work - See page 1 for details.
Original Issue: January 24, 2020
737-52A1180 RB
27 of 27
REQUIREMENTS BULLETIN 737-52A1180
ALERTALERT

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain, except the copies of manufacturers’ service documents, which belong to their rights holders.