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Commercial Airplanes 737 Requirements Bulletin ALERT Number: 737-53A1401 RB Original Issue: April 27, 2021 ATA System: 5321 5232 5261 SUBJECT: FUSELAGE - Passenger Cabin Floors - Main Deck Cargo Compartment and Electrical and Electronics Compartment Sealant Inspection, Installation, and 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:

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: April 27, 2021 737-53A1401 RB 1 of 107

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Original Issue: April 27, 2021 737-53A1401 RB 2 of 107 REQUIREMENTS BULLETIN 737-53A1401

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Table of Contents

1 . E F F E C T I V I T Y5

A . A i r p l a n e s5

B . S p a r e s A f f e c t e d6

2. CONCURRENT REQUIREMENTS6

3 . C O M P L I A N C E6

4. APPROVAL ................................................ 2 0

5. ACCOMPLISHMENT INSTRUCTIONS .................................. 2 1 A. General Information ......................................... 2 1 B. Work Instructions ........................................... 2 3 FIGURE 4: MAIN DECK CARGO COMPARTMENT FLOOR - DRAIN TROUGHS - INSPECTION . . 40 FIGURE 5: MAIN DECK CARGO COMPARTMENT FLOOR - DRAIN TROUGHS - INSTALLATION . 42 FIGURE 6: MAIN DECK CARGO COMPARTMENT FLOOR - DRAIN TROUGH AT STA 360, LBL 58.89 - SEALANT INSPECTION .................................... 4 7 FIGURE 7: MAIN DECK CARGO COMPARTMENT FLOOR - DRAIN TROUGH AT STA 360, LBL 58.89 - SEALANT INSPECTION .................................... 4 9 FIGURE 8: MAIN DECK CARGO COMPARTMENT FLOOR - DRAIN TROUGH AT STA 360, LBL 58.89 - SEALANT INSTALLATION .................................. 5 1 FIGURE 9: MAIN DECK CARGO COMPARTMENT FLOOR - DRAIN TROUGH AT STA 360, LBL 58.89 - SEALANT REPLACEMENT .................................. 5 3 FIGURE 10: MAIN DECK CARGO COMPARTMENT FLOOR - DRAIN SEAL AT STA 360, LBL 58.89 - SEALANT INSPECTION .................................... 5 5 FIGURE 11: MAIN DECK CARGO COMPARTMENT FLOOR - DRAIN SEAL AT STA 360, LBL 58.89 - SEALANT INSPECTION .................................... 5 7 FIGURE 12: MAIN DECK CARGO COMPARTMENT FLOOR - DRAIN SEAL AT STA 360, LBL 58.89 - SEALANT INSTALLATION .................................. 5 9 FIGURE 13: MAIN DECK CARGO COMPARTMENT FLOOR - DRAIN SEAL AT STA 360, LBL 58.89 - SEALANT REPLACEMENT .................................. 6 1 FIGURE 14: MAIN DECK CARGO COMPARTMENT FLOOR - FLOOR PANEL AT STA 354, LBL 58.7 ADJACENT TO RCB - INSPECTION ............................. 6 3 FIGURE 15: MAIN DECK CARGO COMPARTMENT FLOOR - FLOOR PANEL AT STA 354, LBL 58.7 ADJACENT TO RCB - INSPECTION ............................. 6 5 FIGURE 16: MAIN DECK CARGO COMPARTMENT FLOOR - FLOOR PANEL AT STA 354, LBL 58.7 ADJACENT TO RCB - SEALANT INSTALLATION ...................... 6 7 FIGURE 17: MAIN DECK CARGO COMPARTMENT FLOOR - FLOOR PANEL AT STA 354, LBL 58.7 ADJACENT TO RCB - SEALANT REPLACEMENT ..................... 6 9 FIGURE 19: MAIN DECK CARGO COMPARTMENT FLOOR - RIGID CARGO BARRIER AND ADJACENT FLOOR STRUCTURE - SEALANT INSTALLATION ..................... 7 1 FIGURE 20: MAIN DECK CARGO COMPARTMENT FLOOR - FLOOR PANELS AND MOISTURE BARRIER TAPE INSTALLATION ..................................... 7 5 FIGURE 33: MAIN DECK CARGO COMPARTMENT DOOR - WEATHER SEAL - INSTALLATION . . 80 FIGURE 34: ELECTRICAL AND ELECTRONICS COMPARTMENT - E5 RACK DRAIN PAN SHROUD - SEALANT INSPECTION [Group 2] .............................. 8 6 FIGURE 35: ELECTRICAL AND ELECTRONICS COMPARTMENT - E5 RACK DRAIN PAN SHROUD - SEALANT INSPECTION [Group 2] .............................. 9 0 FIGURE 36: ELECTRICAL AND ELECTRONICS COMPARTMENT - E5 RACK DRAIN PAN SHROUD - SEALANT INSTALLATION [Group 2] ............................. 9 4 FIGURE 37: ELECTRICAL AND ELECTRONICS COMPARTMENT - E5 RACK DRAIN PAN SHROUD - SEALANT REPLACEMENT [Group 2] ............................ 9 8 Export Controlled ECCN: 9E991 Copyright © Unpublished Work - See page 1 for details.

Original Issue: April 27, 2021 737-53A1401 RB 3 of 107 REQUIREMENTS BULLETIN 737-53A1401

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FIGURE 38: ELECTRICAL AND ELECTRONICS COMPARTMENT - E5 RACK DRAIN PAN SHROUD,

SHROUD RAIL ASSEMBLY, AND SUPPORT RAIL ASSEMBLY - SEALANT INSTALLATION [Group 2, Configuration 1] .................................. 1 0 2 FIGURE 39: ELECTRICAL AND ELECTRONICS COMPARTMENT - E5 RACK DRAIN PAN SHROUD,

SHROUD RAIL ASSEMBLY, AND SUPPORT RAIL ASSEMBLY - SEALANT INSTALLATION [Group 2, Configuration 2] .................................. 1 0 5 Export Controlled ECCN: 9E991 Copyright © Unpublished Work - See page 1 for details.

Original Issue: April 27, 2021 737-53A1401 RB 4 of 107 REQUIREMENTS BULLETIN 737-53A1401

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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 737-800 Airplane(s), line number(s) 607, 610, 731, 998, 1002, 1024, 1059, 1110, 1135, 1138, 1163, 1170, 1181, 1184, 1201, 1207, 1212, 1234, 1251, 1444, 1608 in 2 Group(s).

The Variable Numbers and Group Information for the applicable airplanes is given below.

DESCRIPTIONCONFIGURATIONGROUP 737-800 Boeing Converted Freighter (BCF) airplanes without airstairs that were modified through Boeing Service Bulletin (SB) 737-00-1025.

-1 737-800 BCF airplanes with airstairs that were modified through Boeing SB 737-00-1023 or SB 737-00-1025.

-2 737-800 BCF airplanes that have not accomplished SB 737-25-1660.1 737-800 BCF airplanes that have accomplished SB 737-25-1660.2 Airplane Models:

Original Issue: April 27, 2021 737-53A1401 RB 5 of 107

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GroupVariable Number 2YC921 - YC922 2YC972 - YC973 2YC977 1YD101 1YD311 - YD313 GroupVariable Number 1YD316 1YD320 1YD322 1YD324 - YD326 1YD328 - YD330 GroupVariable Number 1YD334 2YJ001 2YJ011 -- -- B. Spares Affected None.

2. CONCURRENT REQUIREMENTS None.

3. COMPLIANCE The Federal Aviation Administration (FAA) will possibly release an Airworthiness Directive related to Requirements Bulletin 737-53A1401 RB. The Airworthiness Directive will make the compliance tasks and times given in Requirements Bulletin 737-53A1401 RB mandatory.

Accomplish the required actions, based on the applicable conditions in Tables 1, 2, and 3, in accordance with 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.

Group 1:

Table 1: Main Deck Cargo Compartment Sealant Inspection, Installation, and Replacement Repeat Interval (Not to Exceed) Compliance TimeActionCondition -Within 12 months after the Original Issue date of Requirements Bulletin 737-53A1401 RB.

On the main deck cargo compartment floor, adjacent to the Rigid Cargo Barrier (RCB), do a detailed inspection of the drain troughs for any surface dents or scratches.

All Airplanes -Before further flight.Contact The Boeing Company for repair instructions and do the repair.

CONDITION 1: ANY

SURFACE DENTS GREATER THAN 0.10

INCHES IN DEPTH OR

SCRATCHES GREATER THAN 0.02

INCHES IN DEPTH

FOUND ON ANY

Original Issue: April 27, 2021 737-53A1401 RB 6 of 107 REQUIREMENTS BULLETIN 737-53A1401

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Group 1:

Table 1: Main Deck Cargo Compartment Sealant Inspection, Installation, and Replacement Repeat Interval (Not to Exceed) Compliance TimeActionCondition -Before further flight.Install drain troughs and apply sealant.

CONDITION 2: NO

SURFACE DENTS,

AND NO SCRATCHES

FOUND, OR ANY

SURFACE DENTS

LESS THAN OR EQUAL TO 0.10 INCH-

ES IN DEPTH AND

SCRATCHES LESS

THAN OR EQUAL TO

0.02 INCHES IN

DEPTH FOUND ON

ANY DRAIN TROUGH -Within 12 months after the Original Issue date of Requirements Bulletin 737-53A1401 RB.

Do a detailed inspection of the drain trough at Left Buttock Line (LBL) 58.89 for missing sealant.

All Airplanes -Before further flight.Apply sealant to the drain trough.

CONDITION 3: NO

SEALANT FOUND ON

THE DRAIN TROUGH -Before further flight.Do a detailed inspection of the sealant at the drain trough at LBL 58.89 for smooth continuous sealant application, flaking, and peeling.

CONDITION 4:

SEALANT FOUND ON

THE DRAIN TROUGH -Before further flight.CONDITION 4.1 (ACTION 1):

Remove all sealant from the drain trough.

CONDITION 4.1:

SEALANT ON THE

DRAIN TROUGH

FOUND FLAKING,

PEELING, OR NOT

SMOOTH AND CON-

TINUOUS -Before further flight.CONDITION 4.1 (ACTION 2):

Apply sealant to the drain trough.

--No further action.CONDITION 4.2:

SEALANT ON THE

DRAIN TROUGH

FOUND SMOOTH AND

CONTINUOUS, NOT

FLAKING AND NOT

PEELING -Within 12 months after the Original Issue date of Requirements Bulletin 737-53A1401 RB.

Do a detailed inspection of the drain seal at LBL 58.89 for missing sealant.

Original Issue: April 27, 2021 737-53A1401 RB 7 of 107 REQUIREMENTS BULLETIN 737-53A1401

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Group 1:

SEALANT FOUND ON

THE DRAIN SEAL -Before further flight.Do a detailed inspection of the sealant at the drain seal at LBL 58.89 for smooth continuous sealant application, flaking, and peeling.

CONDITION 6:

SEALANT FOUND ON

THE DRAIN SEAL -Before further flight.CONDITION 6.1 (ACTION 1):

Remove all sealant from the drain seal.

CONDITION 6.1:

SEALANT ON THE

DRAIN SEAL FOUND

FLAKING, PEELING,

OR NOT SMOOTH

AND CONTINUOUS -Before further flight.CONDITION 6.1 (ACTION 2):

Apply sealant to the drain seal.

--No further action.CONDITION 6.2:

SEALANT ON THE

DRAIN SEAL FOUND

SMOOTH AND CON-

TINUOUS, NOT FLAK-

ING, AND NOT PEEL- ING -Within 12 months after the Original Issue date of Requirements Bulletin 737-53A1401 RB.

Do a detailed inspection of the main deck cargo compartment floor panel joints at STA 354, LBL 58.7 adjacent to the RCB for missing sealant.

All Airplanes -Before further flight.Apply sealant to the floor panel joints.

CONDITION 7: NO

SEALANT FOUND ON

THE FLOOR PANEL JOINTS -Before further flight.Do a detailed inspection of the sealant at the floor panel joints at STA 354, LBL 58.7 adjacent to the RCB for smooth continuous sealant application, flaking, and peeling.

CONDITION 8:

SEALANT FOUND ON

ANY FLOOR PANEL JOINT -Before further flight.CONDITION 8.1 (ACTION 1):

Remove all sealant from the floor panel joints.

CONDITION 8.1:

SEALANT ON THE

FLOOR PANEL JOINT

FOUND FLAKING,

PEELING, OR NOT

SMOOTH AND CON-

TINUOUS -Before further flight.CONDITION 8.1 (ACTION 2):

Apply sealant to the floor panel joints.

Original Issue: April 27, 2021 737-53A1401 RB 8 of 107 REQUIREMENTS BULLETIN 737-53A1401

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Group 1:

Table 1: Main Deck Cargo Compartment Sealant Inspection, Installation, and Replacement Repeat Interval (Not to Exceed) Compliance TimeActionCondition --No further action.CONDITION 8.2:

SEALANT ON THE

FLOOR PANEL JOINT

FOUND SMOOTH AND

CONTINUOUS, NOT

FLAKING, AND NOT

PEELING -Within 12 months after the Original Issue date of Requirements Bulletin 737-53A1401 RB.

Between the RCB and the adjacent floor structure, apply sealant into any gaps and mouse holes, until flush with aft face of the RCB.

All Airplanes -Within 12 months after the Original Issue date of Requirements Bulletin 737-53A1401 RB.

Between the RCB and STA 380, apply sealant on the floor panel joints, install moisture barrier tape on the floor panels and install waterseal tape between the RCB and adjacent floor structure.

-Within 12 months after the Original Issue date of Requirements Bulletin 737-53A1401 RB.

Install new Main Deck Cargo Door (MDCD) weather seal.

-Within 12 months after the Original Issue date of Requirements Bulletin 737-53A1401 RB.

Do the Floor Water Leak Test.

(a) -Before further flight.Do a detailed inspection of sealant at all locations specified in this Requirements Bulletin for missing, peeling, or flaking sealant.

CONDITION 9: MORE THAN 4 OUNCES OF

WATER COLLECTS IN

ANY ELECTRICAL

AND ELECTRONICS (EE) COMPARTMENT

DRIP SHIELD -Before further flight.CONDITION 9.1 (ACTION 1):

Reapply sealant at affected location(s).

CONDITION 9.1:

MISSING, PEELING,

OR FLAKING SEALANT FOUND -Before further flight.CONDITION 9.1 (ACTION 2):

Original Issue: April 27, 2021 737-53A1401 RB 9 of 107 REQUIREMENTS BULLETIN 737-53A1401

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Group 1:

CONDITION 10: RE-

PEATED ATTEMPTS

DOES NOT RESULT IN 4 OR LESS

OUNCES OF WATER

FROM COLLECTING

ON ANY EE COM-

PARTMENT DRIP SHIELD

(a) The Floor Water Leak Test is defined as: Make sure the airplane is parked on level surface or up to 5 degrees nose-down attitude. On the forward main deck cargo compartment floor, from STA 460, LBL 25 seat track, empty 3 gallons minimum of potable water in the forward direction between BL 0 to LBL 55. Empty an additional 3 gallons minimum of potable water in the forward direction between BL 0 and RBL 55. Wait a minimum of five minutes.

Four ounces or less of water in any Electrical and Electronics (EE) compartment drip shield is acceptable.

(b) Repeat the test no more than 6 times.

Group 2, Configuration 1:

Table 2: Main Deck Cargo Compartment and Electrical and Electronics Compartment Sealant Inspection, Installation, and Replacement Repeat Interval (Not to Exceed) Compliance TimeActionCondition -Within 12 months after the Original Issue date of Requirements Bulletin 737-53A1401 RB.

On the main cargo compartment floor, adjacent to the Rigid Cargo Barrier (RCB), do a detailed inspection of the drain troughs for any surface dents or scratches.

All Airplanes -Before further flight.Contact The Boeing Company for repair instructions and do the repair.

CONDITION 1: ANY

SURFACE DENTS GREATER THAN 0.10

INCHES IN DEPTH OR

SCRATCHES GREATER THAN 0.02

INCHES IN DEPTH

FOUND ON ANY

Original Issue: April 27, 2021 737-53A1401 RB 10 of 107 REQUIREMENTS BULLETIN 737-53A1401

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Group 2, Configuration 1:

Table 2: Main Deck Cargo Compartment and Electrical and Electronics Compartment Sealant Inspection, Installation, and Replacement Repeat Interval (Not to Exceed) Compliance TimeActionCondition -Before further flight.Install drain troughs and apply sealant.

CONDITION 2: NO

SURFACE DENTS,

AND NO SCRATCHES

FOUND, OR ANY

SURFACE DENTS

LESS THAN OR EQUAL TO 0.10 INCH-

ES IN DEPTH AND

SCRATCHES LESS

THAN OR EQUAL TO

0.02 INCHES IN

DEPTH FOUND ON

ANY DRAIN TROUGH -Within 12 months after the Original Issue date of Requirements Bulletin 737-53A1401 RB.

Do a detailed inspection of the drain trough at Left Buttock Line (LBL) 58.89 for missing sealant.

All Airplanes -Before further flight.Apply sealant to the drain trough.

CONDITION 3: NO

SEALANT FOUND ON

THE DRAIN TROUGH -Before further flight.Do a detailed inspection of the sealant at the drain trough at LBL 58.89 for smooth continuous sealant application, flaking, and peeling.

CONDITION 4:

SEALANT FOUND ON

THE DRAIN TROUGH -Before further flight.CONDITION 4.1 (ACTION 1):

Remove all sealant from the drain trough.

CONDITION 4.1:

SEALANT ON THE

DRAIN TROUGH

FOUND FLAKING,

PEELING, OR NOT

SMOOTH AND CON-

TINUOUS -Before further flight.CONDITION 4.1 (ACTION 2):

Apply sealant to the drain trough.

--No further action.CONDITION 4.2:

SEALANT ON THE

DRAIN TROUGH

FOUND SMOOTH AND

CONTINUOUS, NOT

FLAKING, AND NOT

Original Issue: April 27, 2021 737-53A1401 RB 11 of 107 REQUIREMENTS BULLETIN 737-53A1401

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Group 2, Configuration 1:

Do a detailed inspection of the drain seal at LBL 58.89 for missing sealant.

All Airplanes -Before further flight.Apply sealant to the drain seal.CONDITION 5: NO

SEALANT FOUND ON

THE DRAIN SEAL -Before further flight.Do a detailed inspection of the sealant at the drain seal at LBL 58.89 for smooth continuous sealant application, flaking, and peeling.

CONDITION 6:

SEALANT FOUND ON

THE DRAIN SEAL -Before further flight.CONDITION 6.1 (ACTION 1):

Remove all sealant from the drain seal.

CONDITION 6.1:

SEALANT ON THE

DRAIN SEAL FOUND

FLAKING, PEELING,

OR NOT SMOOTH

AND CONTINUOUS -Before further flight.CONDITION 6.1 (ACTION 2):

Apply sealant to the drain seal.

--No further action.CONDITION 6.2:

SEALANT ON THE

DRAIN SEAL FOUND

SMOOTH AND CON-

TINUOUS, NOT FLAK-

ING, AND NOT PEEL- ING -Within 12 months after the Original Issue date of Requirements Bulletin 737-53A1401 RB.

Do a detailed inspection of the main deck cargo compartment floor panel joints at STA 354, LBL 58.7 adjacent to the RCB for missing sealant.

All Airplanes -Before further flight.Apply sealant to the floor panel joints.

CONDITION 7: NO

SEALANT FOUND ON

CONDITION 8:

SEALANT FOUND ON

Original Issue: April 27, 2021 737-53A1401 RB 12 of 107 REQUIREMENTS BULLETIN 737-53A1401

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