# Boeing Alert Requirements Bulletin 737-26A1151 RB: No revision named

- Rights: © The Boeing Company. Filed by the FAA in regulations.gov docket FAA-2020-0209; AD 2020-21-02 incorporates this document by reference. Not covered by OpenAirDocs’ CC0 dedication.
- Document: [Boeing Alert Requirements Bulletin 737-26A1151 RB](https://openairdocs.org/service-documents/boeing/737-26a1151-rb.md)
- Title as filed: 737-26A1151-00--RB
- Pages: 11
- PDF: https://openairdocs.org/files/sha256/e7/f2/e7f2dfd5ecb5a096d205f0d679a01c0c95f4b4504902d3a9f82e0224842f706c
- Page: https://openairdocs.org/service-documents/boeing/737-26a1151-rb/file/e7f2dfd5ecb5

## Text

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### Page 1

Commercial 
Airplanes
737
Requirements Bulletin
ALERT
Number: 737-26A1151 RB
Original Issue: September 27, 2019
ATA System: 2623
SUBJECT: FIRE PROTECTION - Cargo Fire Extinguishing - Cargo Fire Extinguisher Halon Bottle
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 © 2019 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Unpublished Work.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: September 27, 2019
737-26A1151 RB
1 of 11
3.0

### Page 2

Export Controlled ECCN: 9E991
Copyright © Unpublished
Work - See page 1 for details.
Original Issue: September 27, 2019
737-26A1151 RB
2 of 11
REQUIREMENTS BULLETIN 737-26A1151
ALERTALERT
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### Page 3

Table of Contents
1. EFFECTIVITY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
A. Airplanes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
B. Spares Affected . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2. CONCURRENT REQUIREMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3. COMPLIANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4. APPROVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
5. ACCOMPLISHMENT INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
A. General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
B. Work Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
FIGURE 1: LOW CHARGE PRESSURE CARGO FIRE EXTINGUISHER HALON BOTTLE PART NUMBER
AND AFFECTED SERIAL NUMBERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Export Controlled ECCN: 9E991
Copyright © Unpublished
Work - See page 1 for details.
Original Issue: September 27, 2019
737-26A1151 RB
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REQUIREMENTS BULLETIN 737-26A1151
ALERTALERT

### Page 4

Export Controlled ECCN: 9E991
Copyright © Unpublished
Work - See page 1 for details.
Original Issue: September 27, 2019
737-26A1151 RB
4 of 11
REQUIREMENTS BULLETIN 737-26A1151
ALERTALERT
BLANK PAGE

### Page 5

Commercial 
Airplanes
737
Requirements Bulletin
ALERT
Number: 737-26A1151 RB
Original Issue: September 27, 2019
ATA System: 2623
SUBJECT: FIRE PROTECTION - Cargo Fire Extinguishing - Cargo Fire Extinguisher Halon Bottle
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 737-8, 737-9 Airplane(s), line number(s) 6890, 6904, 6935, 6942,
6949, 6951, 6960, 6963, 6976, 6978, 6980, 6983, 6985, 6988, 7000, 7003, 7005, 7008, 7010,
7013, 7015, 7025, 7027, 7038, 7045, 7048, 7050 in 1 Group(s).
DESCRIPTIONCONFIGURATIONGROUP
737-8, 737-9 Airplanes that may have been delivered with a low
pressure cargo fire extinguisher bottle installed.
-1
Airplane Models:
737-8, 737-9
GroupVariable Number
11A020
11A308
11A407 - 1A408
11A466 - 1A467
11A928
11A954
GroupVariable Number
11B205
11B378 - 1B379
11B388
11B396
11B540
11B566 - 1B567
GroupVariable Number
11B576
11B636
11B801
11C326 - 1C329
11C331
11C401
Export Controlled ECCN: 9E991
Copyright © Unpublished
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Original Issue: September 27, 2019
737-26A1151 RB
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### Page 6

GroupVariable Number
11C701
GroupVariable Number
11D106
GroupVariable Number
--
B. 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 PART 2: CARGO FIRE EXTINGUISHER
HALON BOTTLE INSPECTION for the recommended action. Return any cargo fire extinguisher
halon bottle with the serial number that is in the FIGURE 1 and no circle letter G is found marked
on the bottle to the left of the serial number placard to Kidde Aerospace and Defense. Refer to
Kidde Aerospace and Defense SB 473957-26-518.
Serial NumberPart Number
Refer to FIGURE 1 for affected serial numbers.473957-4
2. CONCURRENT REQUIREMENTS
None.
3. COMPLIANCE
The Federal Aviation Administration (FAA) will possibly release an Airworthiness Directive related to
Requirements Bulletin 737-26A1151 RB. The Airworthiness Directive will make the compliance tasks and
times given in Requirements Bulletin 737-26A1151 RB mandatory.
Accomplish the required action(s), based on the applicable condition(s) in Table 1, in accordance with
Accomplishment Instructions.
Export Controlled ECCN: 9E991
Copyright © Unpublished
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Original Issue: September 27, 2019
737-26A1151 RB
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REQUIREMENTS BULLETIN 737-26A1151
ALERTALERT

### Page 7

Table 1: Cargo Fire Extinguisher Halon Bottle Inspection
NotesRepeat
Interval
Compliance
Time
ActionCondition
--Within 24
months after
the original is-
sue date of Re-
quirements
Bulletin 737-
26A1151 RB.
Inspect the serial number of the cargo
fire extinguisher halon bottle 2, part
number 473957-4. As an alternative, a
review of the maintenance or delivery
records can be used to determine the
serial number of the cargo fire extinguish-
er halon bottle, if the serial number can
be conclusively determined from that
review.
All Airplanes
---No further action is required.CONDITION 1: NO AF-
FECTED SERIAL
NUMBER FOUND OR
A SERIAL NUMBER IN
FIGURE 1 IS FOUND
WITH CIRCLE LETTER
G MARKED TO THE
LEFT OF THE CARGO
FIRE EXTINGUISHER
HALON BOTTLE 2
PLACARD.
(a)-Before further
flight.
Replace the cargo fire extinguisher halon
bottle 2 with a serviceable cargo fire ex-
tinguisher halon bottle.
CONDITION 2: ANY
AFFECTED SERIAL
NUMBER IN FIGURE
1 IS FOUND AND NO
CIRCLE LETTER G
MARKED TO THE
LEFT OF THE CARGO
FIRE EXTINGUISHER
HALON BOTTLE 2
PLACARD.
(a) A serviceable cargo fire extinguisher halon bottle is where (1) THE SERIAL NUMBER IS NOT ON FIGURE
1 OR (2) THE SERIAL NUMBER IS ON FIGURE 1 AND HAS A CIRCLE LETTER "G" FOUND MARKED
TO THE LEFT OF THE CARGO FIRE EXTINGUISHER HALON BOTTLE PLACARD.
4. APPROVAL
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.
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: September 27, 2019
737-26A1151 RB
7 of 11
REQUIREMENTS BULLETIN 737-26A1151
ALERTALERT

### Page 8

Export Controlled ECCN: 9E991
Copyright © Unpublished
Work - See page 1 for details.
Original Issue: September 27, 2019
737-26A1151 RB
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REQUIREMENTS BULLETIN 737-26A1151
ALERTALERT
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### Page 9

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. 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.
5. 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.
Export Controlled ECCN: 9E991
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737-26A1151 RB
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REQUIREMENTS BULLETIN 737-26A1151
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### Page 10

B. WORK INSTRUCTIONS
Actions Required for Compliance
1. Requirements.
Table 1: Cargo Fire Extinguisher Halon Bottle Inspection
NotesRefer to the listed
procedures in SB
Original Issue or later
approved revisions as
an accepted procedure.
Method of
Compliance
ActionCondition
-PART 1: GET ACCESSFIGURE 1Inspect the serial number of
the cargo fire extinguisher
halon bottle 2, part number
473957-4. As an alternative,
a review of the maintenance
or delivery records can be
used to determine the serial
number of the cargo fire extin-
guisher halon bottle, if the se-
rial number can be conclusive-
ly determined from that review.
All Airplanes
PART 2: CARGO FIRE
EXTINGUISHER HALON
BOTTLE 2 INSPECTION
-PART 4: CLOSE AC-
CESS
-No further action is required.CONDITION 1: NO AF-
FECTED SERIAL
NUMBER FOUND OR
A SERIAL NUMBER IN
FIGURE 1 IS FOUND
WITH CIRCLE LETTER
G MARKED TO THE
LEFT OF THE CARGO
FIRE EXTINGUISHER
HALON BOTTLE 2
PLACARD.
(a)PART 3: CARGO FIRE
EXTINGUISHER HALON
BOTTLE 2 REPLACE-
MENT
FIGURE 1Replace the cargo fire extin-
guisher halon bottle 2 with a
serviceable cargo fire extin-
guisher halon bottle.
CONDITION 2: ANY
AFFECTED SERIAL
NUMBER IN FIGURE
1 IS FOUND AND NO
CIRCLE LETTER G
MARKED TO THE
LEFT OF THE CARGO
FIRE EXTINGUISHER
HALON BOTTLE 2
PLACARD.
PART 4: CLOSE AC-
CESS
(a) A serviceable cargo fire extinguisher halon bottle is where (1) THE SERIAL NUMBER IS NOT ON FIGURE
1 OR (2) THE SERIAL NUMBER IS ON FIGURE 1 AND HAS A CIRCLE LETTER "G" FOUND MARKED
TO THE LEFT OF THE CARGO FIRE EXTINGUISHER HALON BOTTLE PLACARD.
Export Controlled ECCN: 9E991
Copyright © Unpublished
Work - See page 1 for details.
Original Issue: September 27, 2019
737-26A1151 RB
10 of 11
REQUIREMENTS BULLETIN 737-26A1151
ALERTALERT

### Page 11 (OCR)

REQUIREMENTS BULLETIN 737-26A1151
ALERT  ALERT
Part  Serial  Part  Serial  Part  Serial  Part  Serial  Part  Serial
Number  Number  Number  Number  Number  Number  Number  Number  Number  Number
473957-4  12785K  473957-4  12838K  473957-4  12877K  473957-4  12905K  473957-4  12957K
473957-4  12784K  473957-4  12839K  473957-4  12878K  473957-4  12906K  473957-4  12938K
473957-4  12785K  473957-4  12840K  473957-4  12879K  473957-4  12907K  473957-4  12939K
473957-4  12786K  473957-4  12841K  473957-4  12880K  473957-4  12908K  473957-4  12940K
473957-4  12787K  473957-4  12842K  473957-4  12881K  473957-4  12909K  473957-4  12941K
473957-4  12788K  478957-4  12843K  478957-4  12882K  478957-4  12910K  473957-4  12942K
473957-4  12789K  473957-4  12844K  478957-4  12883K  473957-4  12911K  473957-4  12943K
473957-4  12790K  473957-4  12845K  473957-4  12884K  473957-4  12912K  473957-4  12944K
473957-4  12791K  473957-4  12846K  473957-4  12886K  473957-4  12913K  473957-4  12945K
473957-4  12795K  473957-4  12847K  473957-4  12887K  473957-4  12914K  473957-4  12946K
473957-4  12796K  473957-4  12848K  473957-4  12888K  473957-4  12915K  473957-4  12976K
473957-4  12797K  473957-4  12849K  473957-4  12889K  473957-4  12916K  473957-4  12977K
473957-4  12807K  473957-4  473957-4  12890K  473957-4  12917K  473957-4  12978K
473957-4  12808K  473957-4  473957-4  12892K  473957-4  12918K  473957-4  12979K
473957-4  12809K  473957-4  473957-4  12894K  473957-4  12919K  473957-4  12980K
473957-4  12810K  473957-4  12855K  473957-4  12895K  473957-4  12920K  473957-4  12981K
473957-4  12811K  473957-4  12856K  473957-4  12896K  473957-4  12921K  473957-4  12984K
473957-4  12812K  473957-4  12857K  473957-4  12897K  473957-4  12922K  473957-4  12986K
473957-4  12813K  473957-4  12870K  473957-4  12898K  473957-4  12923K
473957-4  12814K  473957-4  12871K  473957-4  12899K  473957-4  12924K
473957-4  12832K  473957-4  12872K  473957-4  12900K  473957-4  12925K
473957-4  12833K  473957-4  12873K  473957-4  12901K  473957-4  12926K
473957-4  12834K  473957-4  12874K  473957-4  12902K  473957-4  12927K
473957-4  12835K  473957-4  12875K  473957-4  12903K  473957-4  12935K
473957-4  12836K  473957-4  12876K  473957-4  12904K  473957-4  12936K
FIGURE 1: LOW CHARGE PRESSURE CARGO FIRE EXTINGUISHER HALON BOTTLE PART NUMBER
AND AFFECTED SERIAL NUMBERS
(SHEET 1 OF 1)
Original Issue: September 27, 2019
Export Controlled ECCN: 9E991  737-26A1151 RB
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