Boeing Special Attention Service Bulletin 747-25-3653: Revision 2, text

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Commercial Airplanes 747 Service Bulletin

SPECIAL ATTENTION Number: 747-25-3653 Original Issue: August 04, 2017 Revision 2: January 27, 2023 ATA System: 2511 SUBJECT: EQUIPMENT/FURNISHINGS - Flight Compartment Seats - Captain's and First Officer's Seats - Horizontal Movement System Inspection and Overhaul EXPORT CONTROLLED - This technology or software is subject to the U.S. Export Administration Regulations (EAR), (15 C.F.R. Parts 730-774). No authorization from the U.S. Department of Commerce is required for export, re-export, in-country transfer, or access EXCEPT to country group E:1 or E:2 countries/persons per Supp.1 to Part 740 of the EAR.

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: August 04, 2017 747-25-3653Revision 2: January 27, 2023 1 of 95

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Original Issue: August 04, 2017 747-25-3653Revision 2: January 27, 2023 2 of 95 BOEING SERVICE BULLETIN 747-25-3653

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Table of Contents

Revision Transmittal Sheet5

Summary9

1. PLANNING INFORMATION13

A. Effectivity13

1. Airplanes13

2. Spares Affected16

B. Concurrent Requirements16

C. Reason18

D. Description19

E. Compliance19

F. Approval33

G. Manpower34

H. Weight and Balance Changes38

I. Electrical Load Data38

J. References38

1. Existing Data:38

2. Data Supplied with this Service Bulletin:39

3. Installation Drawings Used in the Preparation of this Service Bulletin:39

K. Publications Affected39

L. Interchangeability and Intermixability of Parts39

M. Software Accomplishment Summary39

2. MATERIAL INFORMATION41

A. Material - Price and Availability41

B. Industry Support Information41

C. Parts Necessary for Each Airplane41

1. Kits/Parts41

2. Parts and Materials Supplied by the Operator41

3. Parts Modified and Reidentified41

4. Parts Removed and Not Replaced43

D. Parts Necessary to Change Spares43

E. Special Tooling - Price and Availability43

F. Special Tooling Necessary to do this Service Bulletin43

3. ACCOMPLISHMENT INSTRUCTIONS45

A. GENERAL INFORMATION45

B. WORK INSTRUCTIONS47

FIGURE 1: FLIGHT COMPARTMENT - CAPTAIN'S SEAT TRACKS - FOREIGN OBJECT DEBRIS -

REMOVAL61

FIGURE 2: FLIGHT COMPARTMENT - FIRST OFFICER'S SEAT TRACKS - FOREIGN OBJECT DEBRIS

- REMOVAL63

APPENDIX A: LOGIC DIAGRAM FOR PARAGRAPH 1.E., COMPLIANCE: TABLE 1: WORK PACKAGE 1 -

CAPTAIN'S SEAT - DETAILED INSPECTION AND OVERHAUL OF THE HORIZONTAL

MOVEMENT SYSTEM [Group 1, Configuration 1, 3]65

APPENDIX B: LOGIC DIAGRAM FOR PARAGRAPH 1.E., COMPLIANCE: TABLE 2: WORK PACKAGE 2 -

FIRST OFFICER'S SEAT - DETAILED INSPECTION AND OVERHAUL OF THE HORIZONTAL

MOVEMENT SYSTEM [Group 1, Configuration 1-2]68

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APPENDIX C: LOGIC DIAGRAM FOR PARAGRAPH 1.E., COMPLIANCE: TABLE 3: WORK PACKAGE 3 -

CAPTAIN'S SEAT - HORIZONTAL ACTUATOR IDENTIFICATION, DETAILED INSPECTION AND OVERHAUL OF THE HORIZONTAL MOVEMENT SYSTEM [Group 1, Configuration 2, 4]

.71

APPENDIX D: LOGIC DIAGRAM FOR PARAGRAPH 1.E., COMPLIANCE: TABLE 4: WORK PACKAGE 4 -

FIRST OFFICER'S SEAT - HORIZONTAL ACTUATOR IDENTIFICATION, DETAILED INSPECTION AND OVERHAUL OF THE HORIZONTAL MOVEMENT SYSTEM [Group 1,

Configuration 3-4]74

APPENDIX E: LOGIC DIAGRAM FOR PARAGRAPH 1.E., COMPLIANCE: TABLE 5: WORK PACKAGE 5 -

CAPTAIN'S SEAT - REPEAT ACTIONS - CHECK OF THE HORIZONTAL MOVEMENT SYSTEM

[Group 1, Configuration 1, 3; Group 2, Configuration 1, 3]77

APPENDIX F: LOGIC DIAGRAM FOR PARAGRAPH 1.E., COMPLIANCE: TABLE 6: WORK PACKAGE 6 -

FIRST OFFICER'S SEAT - REPEAT ACTIONS - CHECK OF THE HORIZONTAL MOVEMENT

SYSTEM [Group 1, Configuration 1-2; Group 2, Configuration 1-2]78

APPENDIX G: LOGIC DIAGRAM FOR PARAGRAPH 1.E., COMPLIANCE: TABLE 7: WORK PACKAGE 7 -

CAPTAIN'S SEAT - REPEAT ACTIONS - HORIZONTAL ACTUATOR IDENTIFICATION AND CHECK OF THE HORIZONTAL MOVEMENT SYSTEM [Group 1, Configuration 2, 4; Group 2,

Configuration 2, 4]79

APPENDIX H: LOGIC DIAGRAM FOR PARAGRAPH 1.E., COMPLIANCE: TABLE 8: WORK PACKAGE 8 -

FIRST OFFICER'S SEAT - REPEAT ACTIONS - HORIZONTAL ACTUATOR IDENTIFICATION AND CHECK OF THE HORIZONTAL MOVEMENT SYSTEM [Group 1, Configuration 3-4; Group

2, Configuration 3-4]81

APPENDIX I: CAPTAIN'S AND FIRST OFFICER'S SEATS, PART NUMBER SERIES 3A258, HORIZONTAL MOVEMENT SYSTEM - HORIZONTAL ACTUATOR LOCATION [Group 1, Configuration 2-4;

Group 2, Configuration 2-4]83

APPENDIX J: LOGIC DIAGRAM FOR PARAGRAPH 1.E., COMPLIANCE: TABLE 9: WORK PACKAGE 1 -

CAPTAIN'S SEAT - DETAILED INSPECTION AND OVERHAUL OF THE HORIZONTAL

MOVEMENT SYSTEM [Group 2, Configuration 1, 3]84

APPENDIX K: LOGIC DIAGRAM FOR PARAGRAPH 1.E., COMPLIANCE: TABLE 10: WORK PACKAGE 2 -

FIRST OFFICER'S SEAT - DETAILED INSPECTION AND OVERHAUL OF THE HORIZONTAL

MOVEMENT SYSTEM [Group 2, Configuration 1-2]87

APPENDIX L: LOGIC DIAGRAM FOR PARAGRAPH 1.E., COMPLIANCE: TABLE 11: WORK PACKAGE 3 -

CAPTAIN'S SEAT - HORIZONTAL ACTUATOR IDENTIFICATION, DETAILED INSPECTION AND OVERHAUL OF THE HORIZONTAL MOVEMENT SYSTEM [Group 2, Configuration 2, 4]

.90

APPENDIX M: LOGIC DIAGRAM FOR PARAGRAPH 1.E., COMPLIANCE: TABLE 12: WORK PACKAGE 4 -

FIRST OFFICER'S SEAT - HORIZONTAL ACTUATOR IDENTIFICATION, DETAILED INSPECTION AND OVERHAUL OF THE HORIZONTAL MOVEMENT SYSTEM [Group 2,

Configuration 3-4]93

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Commercial Airplanes 747 Service Bulletin

SPECIAL ATTENTION Revision Transmittal SheetNumber: 747-25-3653Original Issue: August 04, 2017 Revision 2: January 27, 2023 ATA System: 2511 SUBJECT: EQUIPMENT/FURNISHINGS - Flight Compartment Seats - Captain's and First Officer's Seats - Horizontal Movement System Inspection and Overhaul This revision includes all pages of the service bulletin.

COMPLIANCE INFORMATION RELATED TO THIS REVISION Federal Aviation Administration (FAA) Airworthiness Directive AD 2019-22-02 is related to this service bulletin.

The Federal Aviation Administration (FAA) will possibly release an additional Airworthiness Directive related to this service bulletin. The Airworthiness Directive will make the compliance tasks and times given in this service bulletin mandatory.

Airplane Variable Numbers RR724, RC076 and RC077 were added to new Group 2 of this service bulletin effectivity.

Inactive Airplane Variable Numbers RL562, RM037, RM811, RM812, RM813, RM863, RR522, RS341, RS342, RS703, RS731, RS732, RS781, RS782, RS786, RT007, RT008, RT009, RT035, RT041, RT042, RT043, RT044, RT046, RT047, RT073, RT075, RT121, RT152, RT167, RT431, RT432, RT433, RT434, RT435, RT436, RT437, RT438, RT439, RT441, RT526, RT529, RT577, RT582, RT584, RT586, RT589, RT591, RT635, RT649, RT650, RT702, RT703, RT711, RT712, RT713, RT714, RT715, RT716, RT741, RT742, RT835, RT836, RT932, RT945, RT946, RU001, RU051, RU052, RU059, RU060, RU801, RU802, RU804, RU806, RU807, RU831, RU832, RU833, RU834,RU835, RU836, RU837, RU838, RU839, RU840 and RU841 were added to Group 1 of this service bulletin effectivity.

Effects of this Revision on airplanes on which the Original Issue or Revision 1 was previously done:

None.

REASON FOR REVISION This revision is sent to give the newest issue of each concurrent supplier service bulletin and to change the effectivity of this service bulletin to be for delivered airplanes from line number 669 to 1526, and to add airplanes to effectivity of this service bulletin. Also, added option to install a serviceable seat for the Captain's and First Officer's seats. Compliance tasks for added airplanes are given a new compliance time.

These sections were changed:

1. Summary, Background; changed and added information, added Service Related Problem (SRP) reference and changed the AD related information in the planning table.

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2. Summary, Action; added Engineering Change Memo reference.

3. Summary, Compliance; added AD information.

4. Paragraph 1.A.1., Airplanes; changed and added information, listed specific line numbers and line number ranges, removed airplanes, added airplanes, added Group 2 and related Configurations, removed the note.

5. Paragraph 1.B., Concurrent Requirements; changed to give the newest issue of the supplier service bulletins.

6. Paragraph 1.C., Reason; changed and added information, SRP reference and added Revision 2 information.

7. Paragraph 1.D., Description; added Revision 2 information, and added 'Affected Maintenance Zones' table for Group 2.

8. Paragraph 1.E., Compliance; changed information, added AD information, changed the header of the compliance time columns. Added Option 1 and 2 for Condition 4 of Work Packages 3 and 4, added Tables 9 thru 12, and added applicability to Tables 5 thru 8.

9. Paragraph 1.F., Approval; added 'Union', and added Alternative Method Of Compliance (AMOC) paragraph.

10. Paragraph 1.G., Manpower; changed and added information, removed an incorrect task and footnote from Work Packages 7 and 8, and added applicability.

11. Paragraph 1.J.1., Existing Data; added references.

12. Paragraph 2.C.3., Parts Modified and Reidentified; divided information into two tables and added applicability, and corrected information.

13. Paragraph 3.A., General Information; changed Note 7.

14. Paragraph 3.B., Work Instructions; Changed 'Refer to' to 'At the time specified', added Option 1 and Option 2 for Condition 4 of Work Packages 3 and 4, added applicability, and changed footnote (a) of the table in Parts 1, 2, 3, 4, 7 and 8.

15. Appendix A and Appendix B; added flag note table, added flag note (a) to logic diagrams, and corrected typographical errors.

16. Appendix C and Appendix D; added Option 1 and Option 2 for Condition 4 of Work Packages 3 and 4 to logic diagrams, added flag note (b) to flag note table and logic diagrams, and corrected typographical errors.

17. Appendix E, F, G, H and I; changed applicability.

18. Appendix J, K, L and M; added.

Vertical lines are put on the left edge of each page, except in Paragraph 1.A., Effectivity and format changes, to show the location of all content changes.

Pages with no vertical lines have no changes.

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REVISION HISTORY August 04, 2017Original Issue:

October 19, 2018Revision 1:

January 27, 2023Revision 2:

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Original Issue: August 04, 2017 747-25-3653Revision 2: January 27, 2023 8 of 95 BOEING SERVICE BULLETIN 747-25-3653

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Commercial Airplanes 747 Service Bulletin

SPECIAL ATTENTION SummaryNumber: 747-25-3653Original Issue: August 04, 2017 Revision 2: January 27, 2023 ATA System: 2511 SUBJECT: EQUIPMENT/FURNISHINGS - Flight Compartment Seats - Captain's and First Officer's Seats - Horizontal Movement System Inspection and Overhaul BOEING RECOMMENDS THAT EACH OPERATOR EXAMINE THIS DOCUMENT IMMEDIATELY.

CONCURRENT REQUIREMENTS Refer to Paragraph 1.B., Concurrent Requirements.

BACKGROUND Accomplishment of this service bulletin will decrease the risk that the Captain's and First Officer's seats will have un-commanded seat movement because of horizontal actuator shaft failure. If this service bulletin is not done, the output shaft of the horizontal actuator on the Captain's and First Officer's seat(s) could break and cause an un-commanded seat movement. Un-commanded seat movement could lead to reduced controllability of the airplane.

An operator reported the Captain's seat could not be locked in position after the horizontal position of the seat was adjusted in flight. The seat became unlocked from the track and moved freely forward and aft. Control was given to the First Officer for approach and landing. An inspection found the horizontal actuator output shaft had broken. When the horizontal actuator output shaft breaks, pilot's cannot prevent seat movement in a forward and aft direction and cannot lock the seat in position. A broken shaft is the result of high loads, that are more than design limits, from a stalled motor, that can occur due to high mechanical resistance to motion during powered operation of the seat. Any object that can potentially impede seat movement (Foreign Object Debris (FOD)) in the seat tracks is another condition that can result in a stalled motor and cause the horizontal actuator output shaft to break.

This service bulletin gives instructions for airplanes with powered Ipeco part number series 3A090 Captain's seat or First Officer's seat installed, corrective actions are necessary by an off-airplane inspection of each seat by the applicable Ipeco service bulletin. Repeat on-airplane checks, at intervals not to exceed 36 months, are necessary for the Captain's and First Officer's seats by the applicable Ipeco service bulletin.

This service bulletin gives instructions for airplanes with powered Ipeco part number series 3A258 Captain's seat or First Officer's seat installed, to find the part number and 'amendment' of the horizontal actuator of the Horizontal Movement System (HMS). If the horizontal actuator has Artus part number AD8650503 at 'Amendment B' or earlier or Artus part number AD8650502, corrective actions are necessary by an off-airplane inspection of each seat by the applicable Ipeco service bulletin, where signs of damage to the HMS make the replacement Export Controlled ECCN: 9E991 Copyright © Unpublished Work - See page 1 for details.

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of the horizontal actuator necessary. If the actuator continues to be Artus part number AD8650503 at 'Amendment B' or earlier or Artus part number AD8650502, repeat on-airplane inspections are necessary for the Captain's and First Officer's seats by the applicable Ipeco service bulletin. Installation of a horizontal actuator, Artus part number AD8650503 at 'Amendment C' or later, will significantly decrease the risk of a broken horizontal actuator output shaft.

Boeing Service Related Problem (SRP) 747-SRP-25-0306 and 747-SRP-25-0418 are related to this service bulletin.

Boeing Fleet Team Digest (FTD) 747 FTD 25-12003 is related to this service bulletin.

This table is provided to operators for planning purposes only. Refer to the applicable sections for more information.

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 AffectedYesPublications Affected Paragraph 1.K., Publications AffectedNoAirplane Flight Operations Affected (Flight Crew Operations Manual and/or FAA Approved Airplane Flight Manual) Paragraph 2.C.1., Kits/PartsNoKits/Parts Required Paragraph 2.C.2., Parts and Materials Supplied by the Operator YesOperator Supplied Parts/Material Paragraph 2.F., Special Tooling Necessary to do this Service Bulletin YesSpecial Tooling Required ACTION (PRR 86900-26R, PRR 85901-136S) Do inspections and checks of the Captain's and First Officer's seats. Do corrective actions.

EFFECTIVITY 747-200B/200C/200F/300/400/400D/400F/8/8F Airplanes equipped with Ipeco part number series 3A090 and 3A258 Captain's and First Officer's powered seats. Refer to Paragraph 1.A.1., Airplanes, for the list of affected airplanes.

Refer to Paragraph 1.A.2., Spares Affected for the list of affected components.

COMPLIANCE Federal Aviation Administration (FAA) Airworthiness Directive AD 2019-22-02 is related to this service bulletin.

The effective date of AD 2019-22-02 is January 16, 2020.

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Refer to Paragraph 1.E., Compliance.

INDUSTRY SUPPORT INFORMATION Boeing warranty remedies are not available for the inspection and/or repair procedures given in this service bulletin.

MANPOWER Refer to Paragraph 1.G., Manpower.

MATERIAL INFORMATION Operator Supplied Parts/Materials.

Refer to Paragraph 2.A., Material - Price and Availability.

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BOEING SERVICE BULLETIN 747-25-3653

FIRST OFFICER'S SEAT

- CAPTAIN'S

DO INSPECTIONS AND CHECKS OF THE CAPTAIN'S AND FIRST OFFICER'S SEATS.

FWD DO CORRECTIVE ACTIONS.

CAPTAIN'S SEAT (FIRST OFFICER'S SEAT OPPOSITE) (TYPICAL) 2383465 Original Issue: August 04, 2017 Revision 2: January 27, 2023 747-25-3653 Export Controlled ECCN: 9E991 Copyright © Unpublished Work - See page 1 for details. 12 of 95

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