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Commercial Airplanes 737 Requirements Bulletin ALERT Number: 737-34A3572 RB Original Issue: October 15, 2020 ATA System: 3431 SUBJECT: NAVIGATION - Instrument Landing System - Multi-Mode Receiver Software Change 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 © 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Unpublished Work.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.

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Table of Contents

1. EFFECTIVITY5

A. Airplanes5

B. Spares Affected6

2. CONCURRENT REQUIREMENTS6

3. COMPLIANCE7

4. APPROVAL8

5. ACCOMPLISHMENT INSTRUCTIONS11

A. General Information11

B. Work Instructions12

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Commercial Airplanes 737 Requirements Bulletin ALERT Number: 737-34A3572 RB Original Issue: October 15, 2020 ATA System: 3431 SUBJECT: NAVIGATION - Instrument Landing System - Multi-Mode Receiver Software Change

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) 6973, 6983, 6990, 6995, 7003, 7008, 7015, 7018, 7028, 7038, 7043, 7045, 7048, 7050, 7053, 7064, 7068, 7070, 7085, 7088, 7093, 7095-7096, 7103, 7108, 7118, 7125, 7128, 7132-7133, 7140, 7147-7148, 7155, 7158, 7160, 7165-7166, 7168, 7175, 7180-7181, 7185-7186, 7190, 7192-7193, 7196, 7200, 7203, 7208, 7210-7211, 7215-7216, 7220, 7222-7223, 7225, 7228, 7231, 7233, 7237-7238, 7240, 7246, 7248, 7250, 7252, 7255, 7261, 7265, 7268, 7270-7271, 7278, 7282-7283, 7286, 7290-7291, 7293, 7295-7296, 7298, 7301, 7303, 7306, 7310-7311, 7313, 7315, 7320, 7325, 7330-7331, 7333, 7336, 7340, 7345, 7348, 7353, 7355-7356, 7365-7366, 7368, 7370, 7373, 7375, 7381, 7384-7385, 7388-7390, 7393, 7395, 7400-7401, 7403, 7405-7406, 7410-7411, 7413, 7416, 7419, 7435 in 3 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 Airplanes with Rockwell Collins Multi-Mode Receivers (MMRs) GLU-2100 installed by Service Bulletin (SB) 737-34-3404.

-1 Airplanes with Rockwell Collins MMRs GLU-2100 installed by SB 737-34-3405.

-2 Airplanes with Rockwell Collins MMRs GLU-2100 installed in production.

-3 Airplane Models:

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737-8, 737-9 GroupVariable Number 31A211 31A315 - 1A318 11A544 - 1A545 21A614 21A756 - 1A757 31A856 - 1A866 31A918 - 1A919 31A929 31A943 31A955 - 1A956 31B007 - 1B011 31B115 - 1B124 31B206 GroupVariable Number 21B491 - 1B494 21B511 - 1B512 21B521 - 1B522 21B531 31B566 - 1B569 31B576 - 1B578 31B652 - 1B657 31B701 31B930 - 1B934 31C201 - 1C202 31C304 - 1C305 31C327 - 1C335 31C501 - 1C510 GroupVariable Number 31C690 31C701 - 1C711 31C826 - 1C827 31C946 - 1C947 31D051 - 1D056 31D251 - 1D253 11D401 31D466 31J041 - 1J042 31J066 - 1J067 31J101 - 1J102 31J401 - 1J402 -- B. Spares Affected None.

2. CONCURRENT REQUIREMENTS The service bulletin(s) listed below must be done before or at the same time as this service bulletin:

Group 1:

DescriptionService BulletinCompany NAVIGATION - Instrument Landing System - Multi-Mode Receiver Replacement 737-34-3404 Original IssueBoeing Group 2:

DescriptionService BulletinCompany NAVIGATION - Instrument Landing System - Multi-Mode Receiver Replacement 737-34-3405 Original IssueBoeing Group 3:

None.

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3. COMPLIANCE The Federal Aviation Administration (FAA) will possibly release an Airworthiness Directive related to Requirements Bulletin 737-34A3572 RB. The Airworthiness Directive will make the compliance tasks and times given in Requirements Bulletin 737-34A3572 RB mandatory.

Federal Aviation Administration (FAA) Airworthiness Directive AD 2020-03-20 is related to Requirements Bulletin 737-34A3572 RB. The effective date of AD 2020-03-20 is February 18, 2020.

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

Group 1-2:

Table 1: Multi-Mode Receiver Software Installation and Configuration Check Repeat Interval Compliance TimeActionCondition -Within 12 months after the original issue date of Requirements Bulletin 737-34A3572 RB.

ACTION 1: Do all applicable ACCOMPLISHMENT INSTRUCTIONS actions identified in the service bulletin specified in CONCURRENT REQUIRE- MENTS.

All Airplanes -ACTION 2: Install the Multi-Mode Receiver (MMR) Operational Program Software (OPS) part number COL4C-0087-0003 or later approved software part number in MMR 1 and MMR 2.

-ACTION 3: Install the MMR Option Selection Software (OSS) part number BCG27-U000-0730 or later approved software part number in MMR 1 and MMR 2.

-ACTION 4: Do the software configuration check and make sure that software part number COL4C- 0087-0003 or later approved software part number is installed in MMR 1 and MMR 2. If software part number COL4C-0087-0003 or later approved software part number is not shown as installed in MMR 1 and MMR 2, do corrective action(s) until the software part number is shown as installed in MMR 1 and MMR 2.

-ACTION 5: Do the software configuration check and make sure that software part number BCG27- U000-0730 or later approved software part number is installed in MMR 1 and MMR 2. If software part number BCG27-U000-0730 or later approved software part number is not shown as installed in MMR 1 and MMR 2, do corrective action(s) until the software part number is shown as installed in MMR 1 and MMR 2.

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Group 3:

Table 2: Multi-Mode Receiver Software Installation and Configuration Check Repeat Interval Compliance TimeActionCondition -Within 12 months after the original issue date of Requirements Bulletin 737-34A3572 RB.

ACTION 1: Install the Multi-Mode Receiver (MMR) Operational Program Software (OPS) part number COL4C-0087-0003 or later approved software part number in MMR 1 and MMR 2.

All Airplanes -ACTION 2: Install the MMR Option Selection Software (OSS) part number BCG27-U000-0730 or later approved software part number in MMR 1 and MMR 2.

-ACTION 3: Do the software configuration check and make sure that software part number COL4C- 0087-0003 or later approved software part number is installed in MMR 1 and MMR 2. If software part number COL4C-0087-0003 or later approved software part number is not shown as installed in MMR 1 and MMR 2, do corrective action(s) until the software part number is shown as installed in MMR 1 and MMR 2.

-ACTION 4: Do the software configuration check and make sure that software part number BCG27- U000-0730 or later approved software part number is installed in MMR 1 and MMR 2. If software part number BCG27-U000-0730 or later approved software part number is not shown as installed in MMR 1 and MMR 2, do corrective action(s) until the software part number is shown as installed in MMR 1 and MMR 2.

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 Union 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.

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In addition, the Manager of FAA Seattle Aircraft Certification Office approves the action (i.e. inspection or modification) defined in this requirements bulletin as an alternative method of compliance to the requirements of paragraph (g) of AD 2020-03-20. For operators with common flight crew procedures used for multiple affected airplanes in their fleet, operators must update the software on all of their affected airplanes prior to removing the limitation from the Airplane Flight Manuals. All provisions of AD 2020-03-20 that are not specifically referenced in the above statement remain fully applicable and must be complied with.

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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. Later approved software is only software that is approved by Boeing as a replacement for the software specified in this bulletin and approved as part of the type design by the Federal Aviation Administration (FAA) after issuance of this bulletin Original Issue date.

5. 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.

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B. WORK INSTRUCTIONS Actions Required for Compliance

1. Requirements:

Group 1-2:

Table 1: Multi-Mode Receiver Software Installation and Configuration Check Refer to the listed procedures in SB 737-34A3572 Original Issue or later approved revisions as an accepted procedure.

Method of Compliance ActionCondition --ACTION 1: Do all applicable ACCOMPLISH- MENT INSTRUCTIONS actions identified in the service bulletin specified in CONCUR- RENT REQUIREMENTS.

All Airplanes PART 1: MMR OPS Installation -ACTION 2: Install the Multi-Mode Receiver (MMR) Operational Program Software (OPS) part number COL4C-0087-0003 or later approved software part number in MMR 1 and MMR 2.

PART 2: MMR OSS Installation -ACTION 3: Install the MMR Option Selection Software (OSS) part number BCG27-U000- 0730 or later approved software part number in MMR 1 and MMR 2.

PART 3: MMR OPS Configuration Check -ACTION 4: Do the software configuration check and make sure that software part number COL4C-0087-0003 or later approved software part number is installed in MMR 1 and MMR 2. If software part number COL4C-0087-0003 or later approved software part number is not shown as installed in MMR 1 and MMR 2, do corrective action(s) until the software part number is shown as installed in MMR 1 and MMR 2.

PART 4: MMR OSS Configuration Check -ACTION 5: Do the software configuration check and make sure that software part number BCG27-U000-0730 or later approved software part number is installed in MMR 1 and MMR 2. If software part number BCG27-U000-0730 or later approved software part number is not shown as installed in MMR 1 and MMR 2, do corrective action(s) until the software part number is shown as installed in MMR 1 and MMR 2.

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