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Commercial Airplanes 757 Service Bulletin
SPECIAL ATTENTION Number: 757-25-0308 Original Issue: November 07, 2017 Revision 2: June 12, 2023 ATA System: 2511 SUBJECT: EQUIPMENT/FURNISHINGS - Flight Compartment Seats - Captain's and First Officer's Seat - 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:
BOEING PROPRIETARY, CONFIDENTIAL AND/OR TRADE SECRET Copyright © 2017 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Unpublished Work.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: November 07, 2017 757-25-0308Revision 2: June 12, 2023 1 of 69
2.0
Export Controlled ECCN: 9E991
BOEING PROPRIETARY Copyright © Unpublished Work - See page 1 for details.
Original Issue: November 07, 2017 757-25-0308Revision 2: June 12, 2023 2 of 69 BOEING SERVICE BULLETIN 757-25-0308
BLANK PAGE
Table of Contents
Revision Transmittal Sheet5
Summary9
1. PLANNING INFORMATION13
A. Effectivity13
1. Airplanes13
2. Spares Affected14
B. Concurrent Requirements14
C. Reason15
D. Description16
E. Compliance16
F. Approval24
G. Manpower25
H. Weight and Balance Changes29
I. Electrical Load Data29
J. References29
1. Existing Data:29
2. Data Supplied with this Service Bulletin:29
3. Installation Drawings Used in the Preparation of this Service Bulletin:29
K. Publications Affected29
L. Interchangeability and Intermixability of Parts30
M. Software Accomplishment Summary30
2. MATERIAL INFORMATION31
A. Material - Price and Availability31
B. Industry Support Information31
C. Parts Necessary for Each Airplane31
1. Kits/Parts31
2. Parts and Materials Supplied by the Operator31
3. Parts Modified and Reidentified31
4. Parts Removed and Not Replaced32
D. Parts Necessary to Change Spares32
E. Special Tooling - Price and Availability32
F. Special Tooling Necessary to do this Service Bulletin32
3. ACCOMPLISHMENT INSTRUCTIONS33
A. GENERAL INFORMATION33
B. WORK INSTRUCTIONS35
FIGURE 1: FLIGHT COMPARTMENT - CAPTAIN'S SEAT TRACKS - FOREIGN OBJECT DEBRIS -
REMOVAL47
FIGURE 2: FLIGHT COMPARTMENT - FIRST OFFICER'S SEAT TRACKS - FOREIGN OBJECT DEBRIS
- REMOVAL49
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]51
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 [Group 1, Configuration 1-2]54
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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]
.57
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]60
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]63
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]64
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] . . . 65 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] . 67 APPENDIX I: CAPTAIN'S AND FIRST OFFICER'S SEATS, PART NUMBER SERIES 3A258, HORIZONTAL MOVEMENT SYSTEM - HORIZONTAL ACTUATOR LOCATION [Group 1, Configuration 2-4]
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Original Issue: November 07, 2017 757-25-0308Revision 2: June 12, 2023 4 of 69 BOEING SERVICE BULLETIN 757-25-0308
Commercial Airplanes 757 Service Bulletin
SPECIAL ATTENTION Revision Transmittal SheetNumber: 757-25-0308Original Issue: November 07, 2017 Revision 2: June 12, 2023 ATA System: 2511 SUBJECT: EQUIPMENT/FURNISHINGS - Flight Compartment Seats - Captain's and First Officer's Seat - 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 2018-26-03 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.
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 add a newer issue of each concurrent supplier service bulletin and to add an option to install a serviceable seat for Condition 4 of Work Packages 3 and 4.
These sections were changed:
1. In Summary, Background; changed information, added Service Related Problem (SRP) reference.
2. In Summary, Effectivity; added 'equipped'.
3. In Summary, Compliance; added AD information.
4. In Paragraph 1.A.1., Airplanes; changed information and listed specific line numbers and line number ranges. Deleted Engineering Change Memo PRR 54530-316RS.
5. In Paragraph 1.B., Concurrent Requirements; changed to add a newer issue of each concurrent supplier service bulletin.
6. In Paragraph 1.C., Reason; changed information, added SRP reference and Revision 2 information.
7. In Paragraph 1.D., Description; added Revision 2 information.
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8. In Paragraph 1.E., Compliance; changed the information related to Paragraph 3. Accomplishment Instructions and deleted information related to logic diagram references. Added AD information and changed the header of the compliance time columns. Added Option 1 and Option 2 for Condition 4 of Work Packages 3 and 4.
9. In Paragraph 1.F., Approval; added 'Union' and Alternative Method Of Compliance (AMOC) information.
10. In Paragraph 1.G., Manpower; added footnote (c) for the tables for Work Packages 3 and 4. Changed a task and added values for the tables for Work Package 5 and 6.
11. In Paragraph 1.J.1., Existing Data; added references, deleted a reference.
12. In Paragraph 2.A., Material - Price and Availability; added a reference to Paragraph 2.D., Parts Necessary to Change Spares.
13. In Paragraph 2.C.2., Parts and Materials Supplied by the Operator; changed part numbers, added applicability, changed column headers. Changed footnotes (a) and (b).
14. In Paragraph 2.C.3., Parts Modified and Reidentified; divided information into two tables and added applicability.
15. In Paragraph 3.A., General Information; changed note 3, added information in note 4, added part numbers in notes 15 and 16.
16. In Paragraph 3.B., Work Instructions:
a. Added Option 1 and Option 2 for Condition 4 of Work Packages 3 and 4.
b. Changed a conditional action in Work Packages 3, 4, 7 and 8.
c. Changed footnote (a) in the table of Parts 1, 2, 3, 4, 7 and 8.
d. Added seat part numbers in Parts 5 and 6.
17. Figure 1 and Figure 2; added a reference.
18. Appendix A and Appendix B; added flag note table, added flag note (a) to logic diagrams, and corrected typographical errors.
19. Appendix C and Appendix D:
a. Added information to flag note (a).
b. Added flag note (b) to flag note table and logic diagrams.
c. Added Option 1 and Option 2 for Condition 4 of Work Packages 3 and 4 to logic diagrams.
d. Corrected typographical errors.
20. Appendix G and Appendix H; added information to flag note (a).
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.
Export Controlled ECCN: 9E991
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Original Issue: November 07, 2017 757-25-0308Revision 2: June 12, 2023 6 of 69 BOEING SERVICE BULLETIN 757-25-0308
Pages with no vertical lines have no changes.
REVISION HISTORY November 07, 2017Original Issue:
June 07, 2018Revision 1:
June 12, 2023Revision 2:
Export Controlled ECCN: 9E991
BOEING PROPRIETARY Copyright © Unpublished Work - See page 1 for details.
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Export Controlled ECCN: 9E991
BOEING PROPRIETARY Copyright © Unpublished Work - See page 1 for details.
Original Issue: November 07, 2017 757-25-0308Revision 2: June 12, 2023 8 of 69 BOEING SERVICE BULLETIN 757-25-0308
BLANK PAGE
Commercial Airplanes 757 Service Bulletin
SPECIAL ATTENTION SummaryNumber: 757-25-0308Original Issue: November 07, 2017 Revision 2: June 12, 2023 ATA System: 2511 SUBJECT: EQUIPMENT/FURNISHINGS - Flight Compartment Seats - Captain's and First Officer's Seat - 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, pilots 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 numbers series 3A090 Captain's seat or First Officer's seat installed. Corrective actions are necessary by an off-airplane inspection of the seat by the applicable Ipeco service bulletin. Repeat on-airplane check, at intervals not to exceed 36 months, are necessary for the Captain's and First Officer's seats by the applicable Ipeco service bulletin.
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This service bulletin gives instructions to find the part number and 'amendment' of the horizontal actuator of the Horizontal Movement System (HMS) of the Captain's and First Officer's seats. 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 the seat by the applicable Ipeco service bulletin, where signs of damage to the HMS make the replacement of the horizontal actuator necessary. If the actuator continues to be Artus part number AD8650503 at 'Amendment B' or earlier, or 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 Problems (SRP) 757-SRP-25-0306 and 757-SRP-25-0418 are related to this service bulletin.
Boeing Fleet Team Digest (FTD) 757 FTD 25-12002 is related to this problem.
PRR 54530-316RS 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 Material Paragraph 2.F., Special Tooling Necessary to do this Service Bulletin YesSpecial Tooling Required ACTION Do inspections and checks of the Captain's and First Officer's seats. Do corrective actions.
EFFECTIVITY 757-200 Airplane(s) 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 airplane(s).
Refer to Paragraph 1.A.2., Spares Affected, for the list of affected components.
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Original Issue: November 07, 2017 757-25-0308Revision 2: June 12, 2023 10 of 69 BOEING SERVICE BULLETIN 757-25-0308
COMPLIANCE Federal Aviation Administration (FAA) Airworthiness Directive AD 2018-26-03 is related to this service bulletin.
The effective date of AD 2018-26-03 is January 31, 2019.
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.
Export Controlled ECCN: 9E991
BOEING PROPRIETARY Copyright © Unpublished Work - See page 1 for details.
Original Issue: November 07, 2017 757-25-0308Revision 2: June 12, 2023 11 of 69 BOEING SERVICE BULLETIN 757-25-0308
BOEING SERVICE BULLETIN 757-25-0308 FIRST
OFFICER'S SEAT
CAPTAIN'S SEAT
DO INSPECTIONS AND CHECKS OF THE CAPTAIN'S AND FIRST OFFICER'S SEATS.
DO CORRECTIVE ACTIONS.
FWD CAPTAIN'S SEAT 2186544 (TYPICAL) (FIRST OFFICER'S SEAT OPPOSITE) Original Issue: November 07, 2017 Revision 2: June 12, 2023 Export Controlled ECCN: 9E991 BOEING PROPRIETARY 757-25-0308 Copyright © Unpublished Work - See page 1 for details. 12 of 69