# Boeing Special Attention Service Bulletin 767-25-0539: Revision 1

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- Document: [Boeing Special Attention Service Bulletin 767-25-0539](https://openairdocs.org/service-documents/boeing/sb-767-25-0539.md)
- Title as filed: SB-767-25-0539-01--
- Pages: 26
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## Text

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### Page 1

Commercial 
Airplanes
767
Service Bulletin
SPECIAL ATTENTION
Number: 767-25-0539
Original Issue: January 09, 2014
Revision 1: July 17, 2018
ATA System: 2511
SUBJECT: EQUIPMENT / FURNISHINGS - Flight Compartment Seats - Captain's and First Officer's
Seat - Manual Override Cable Inspection and Adjustment
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 © 2014 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Unpublished Work.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: January 09, 2014
767-25-0539Revision 1: July 17, 2018
1 of 26
3.0

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Table of Contents
Revision Transmittal Sheet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1. PLANNING INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
A. Effectivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
1. Airplanes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2. Spares Affected . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
B. Concurrent Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
C. Reason . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
D. Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
E. Compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
F. Approval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
G. Manpower . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
H. Weight and Balance Changes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
I. Electrical Load Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
J. References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
1. Existing Data: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
2. Data Supplied with this Service Bulletin: . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
3. Installation Drawings Used in the Preparation of this Service Bulletin: . . . . . . . . . . . 18
K. Publications Affected . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
L. Interchangeability and Intermixability of Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
M. Software Accomplishment Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
2. MATERIAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
A. Material - Price and Availability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
B. Industry Support Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
C. Parts Necessary for Each Airplane . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
1. Kits/Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
2. Parts and Materials Supplied by the Operator . . . . . . . . . . . . . . . . . . . . . . . . 19
3. Parts Modified and Reidentified . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4. Parts Removed and Not Replaced . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
D. Parts Necessary to Change Spares . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
E. Special Tooling - Price and Availability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
F. Special Tooling Necessary to do this Service Bulletin . . . . . . . . . . . . . . . . . . . . . . . 19
3. ACCOMPLISHMENT INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
A. GENERAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
B. WORK INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
FIGURE 1: FLIGHT COMPARTMENT SEATS - SEAT IDENTIFICATION . . . . . . . . . . . . . . . . 25
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Commercial 
Airplanes
767
Service Bulletin
SPECIAL ATTENTION
Revision Transmittal SheetNumber: 767-25-0539Original Issue: January 09, 2014
Revision 1: July 17, 2018
ATA System: 2511
SUBJECT: EQUIPMENT / FURNISHINGS - Flight Compartment Seats - Captain's and First Officer's
Seat - Manual Override Cable Inspection and Adjustment
This revision includes all pages of the service bulletin.
COMPLIANCE INFORMATION RELATED TO THIS REVISION
The Federal Aviation Administration (FAA) will possibly release an 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 VR260, VR401, VT033, VT551, VT552, VT558 thru VT610 were added to Group 1
of this service bulletin effectivity.
Effects of this Revision on airplanes on which the Original Issue was previously done:
None.
REASON FOR REVISION
This revision is sent to add delivered 767 airplanes that had Ipeco powered Captain's and First Officer's seats
installed during production or in retrofit, and all future deliveries with Ipeco powered Captain's and First Officer's
seats to the effectivity of this service bulletin. This revision also adds instructions to identify specific Captain's
and First Officer's seat serial numbers for seat part numbers 3A258-0041-01-1 and 3A258-0042-01-1. And, seat
part numbers 3A258-0041-01-2 and 3A258-0042-01-2 were added to the Serviceable Seat definition. Airplane
variable number VR260 is added because it is applicable to Boeing service bulletin 767-25-0546, and airplane
variable numbers VT551 and VT552 are added because they are applicable to Boeing service bulletin
767-25-0556, the two of which install Ipeco powered Captain's and First Officer's seats which are subsequently
affected by this service bulletin. Airplane variable number VR401 is added because it was not included in the
Original Issue of this service bulletin. Also, Captain's seat part number 3A090-0077-01-1 and First Officer's seat
part number 3A090-0078-01-1, the two of which are specified in Ipeco SB 210-25-04, are added to this service
bulletin. First Officer's seat part numbers 3A090-0078-03-1 and 3A090-0078-05-1, the two of which were
reidentified back to First Officer's seat part number 3A090-0078-02-1, are removed from this service bulletin.
These sections were changed:
1. Summary, Background: Changed information.
2. Summary, Action: Changed instructions and information.
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3. Summary, Effectivity: Changed information.
4. Summary, Compliance: Changed information.
5. Summary, Illustration: Changed.
6. Paragraph 1.A.1., Airplanes: Changed information. Added airplanes to Group 1.
7. Paragraph 1.A.2., Spares Affected: Added seat part numbers.
8. Paragraph 1.B., Concurrent Requirements: Changed information.
9. Paragraph 1.C., Reason: Changed information. Added Revision 1 information.
10. Paragraph 1.D., Description: Changed instructions and information. Added Revision 1 information.
11. Paragraph 1.E., Compliance: Added information.
12. Paragraph 1.G., Manpower: Changed footnote (c).
13. Paragraph 3.A., General Information: Added and deleted notes.
14. Paragraph 3.B., Work Instructions: Added steps for seat identification. Added part numbers. Changed
instructions.
15. Figure 1: Changed title. Changed footnote (a) of the step table.
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.
REVISION HISTORY
January 09, 2014Original Issue:
July 17, 2018Revision 1:
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BOEING SERVICE BULLETIN 767-25-0539

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Commercial 
Airplanes
767
Service Bulletin
SPECIAL ATTENTION
SummaryNumber: 767-25-0539Original Issue: January 09, 2014
Revision 1: July 17, 2018
ATA System: 2511
SUBJECT: EQUIPMENT / FURNISHINGS - Flight Compartment Seats - Captain's and First Officer's
Seat - Manual Override Cable Inspection and Adjustment
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 make sure that Captain's and First Officer's seats do not have
un-commanded movement due to an improperly adjusted cable for the manual release lever. If this service
bulletin is not done, the manual control lever cable could be incorrectly adjusted which could result in its clutch
mechanism (dogs) not engaging correctly and cause an un-commanded seat movement. An un-commanded
seat movement during a critical part of a flight, such as take-off or landing could cause a flight control obstruction
or unintended flight control input which could result in the loss of the ability to control the airplane.
A 747 operator reported that during a takeoff, the First Officer's seat unlocked from it's seat tracks and moved
aft. The first officer was unable to control the airplane and the captain took over the controls to avoid a rejected
takeoff. The unlocking of the seat from the seat tracks was caused by actuator damage which was a result of
incorrect adjustment of the seats manual release lever cable, allowing the clutch dogs to only partially engage.
Because 767 airplanes use the same seats in the flight compartment, Boeing has issued this service bulletin to
do a one time inspection, and if necessary an adjustment, in accordance with an Ipeco Service Bulletin. Three
Ipeco Service Bulletins have been issued to account for different part number seats installed. Because of
in-service seat interchangeability, operators are told to inspect the part number of the seats installed and use
the applicable Ipeco Service Bulletin.
This service bulletin gives instructions to find the identification of the installed Captain's and First Officer's seats
and to do an inspection, and if necessary an adjustment, of each seat's fore/aft manual control lever and vertical
manual control lever in accordance with an Ipeco Service Bulletin. The inspection, and if necessary the adjustment
of the manual control levers of the Captain's and First Officer's seats, will make sure that the seats do not have
un-commanded seat movement due to improperly adjusted fore/aft and vertical manual control levers.
Boeing Service Related Problem (SRP) 767-SRP-25-0320 is related to this service bulletin.
Boeing Fleet Team Digest (FTD) 767 FTD 25-13003 is related to this service bulletin.
This table is provided to operators for planning purposes only. Refer to the applicable sections for more
information.
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ReferenceAffectedPlanning Data
Paragraph 1.A.2., Spares AffectedYesSpares Affected
Paragraph 1.E., ComplianceYesAD Related
Paragraph 1.H., Weight and Balance ChangesNoWeight and Balance Change
Paragraph 1.I., Electrical Load DataNoElectrical Load Changed
Paragraph 1.K., Publications AffectedNoPublications 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
NoOperator Supplied Parts/Material
Paragraph 2.F., Special Tooling Necessary to
do this Service Bulletin
NoSpecial Tooling Required
ACTION
Get access to the flight compartment. Find the part number of the installed Captain's and First Officer's seats.
If specific seat part numbers are found, find the serial number of those seats. For specific part numbers and
serial numbers of Captain's and First Officer's seats do a Detailed Inspection of the fore/aft manual control lever
and the vertical manual control lever on each seat for looseness in accordance with the applicable Ipeco Service
Bulletin. If a control lever inspection is not within limits, remove the seat and install a serviceable seat. Do an
operational test of each adjusted seat.
NOTE: A serviceable Captain's seat in this service bulletin is defined as seat part number 3A258-0041-01-2,
or is a Captain's seat that has done the inspections and all applicable corrective actions in accordance
with the applicable Ipeco service bulletin. A serviceable First Officer's seat in this service bulletin is
defined as seat part number 3A258-0042-01-2, or is a First Officer's seat that has done the inspections
and all applicable corrective actions in accordance with the applicable Ipeco service bulletin.
EFFECTIVITY
767-200/300/300F/400ER Airplanes. 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
The Federal Aviation Administration (FAA) will possibly release an Airworthiness Directive related to this service
bulletin. The Airworthiness Directive will make the compliance tasks and times given in this service bulletin
mandatory.
Boeing recommends that the inspection, and all applicable corrective actions, given in this service bulletin be
done within 72 months after the Original Issue date of this service bulletin.
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INDUSTRY SUPPORT INFORMATION
Boeing warranty remedies are not available for the inspection and adjustment given in this service bulletin.
MANPOWER
Refer to Paragraph 1.G., Manpower.
MATERIAL INFORMATION
None.
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BOEING SERVICE BULLETIN 767-25-0539
FIRST OFFICER'S  FIND THE PART NUMBER OF THE INSTALLED
SEAT  CAPTAIN'S AND FIRST OFFICER'S SEATS
FIND THE SERIAL NUMBER OF SPECIFIC
SEAT PART NUMBERS
DO A DETAILED INSPECTION OF THE
VERTICAL MANUAL CONTROL LEVER
FOR LOOSENESS IN ACCORDANCE
WITH THE APPLICABLE IPECO
SERVICE BULLETIN.
IF A CONTROL LEVER INSPECTION IS
NOT WITHIN LIMITS, REMOVE THE
SEAT AND INSTALL A SERVICEABLE
SEAT. TEST.
CAPTAIN'S SEAT
FIRST OFFICER'S SEAT OPPOSITE
(TYPICAL)
(RIGHT SIDE VIEW)
FWD
CAPTAIN'S SEAT
FIRST OFFICER'S SEAT OPPOSITE
(TYPICAL
(LEFT SIDE VIEW
DO A DETAILED INSPECTION OF THE
FORE/AFT MANUAL CONTROL LEVER FOR
LOOSENESS IN ACCORDANCE WITH THE
APPLICABLE IPECO SERVICE BULLETIN. IF
A CONTROL LEVER INSPECTION IS NOT
WITHIN LIMITS, REMOVE THE SEAT AND
INSTALL A SERVICEABLE SEAT. TEST.
2304527
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### Page 11

Commercial 
Airplanes
767
Service Bulletin
SPECIAL ATTENTION
Number: 767-25-0539
Original Issue: January 09, 2014
Revision 1: July 17, 2018
ATA System: 2511
SUBJECT: EQUIPMENT / FURNISHINGS - Flight Compartment Seats - Captain's and First Officer's
Seat - Manual Override Cable Inspection and Adjustment
BOEING RECOMMENDS THAT EACH OPERATOR EXAMINE THIS DOCUMENT IMMEDIATELY.
1.    PLANNING INFORMATION
A. Effectivity
1. Airplanes
Refer to Service Bulletin Index D624T001 Part 3 for Airplane Variable Number, Line Number, and
Serial Number data.
This service bulletin is applicable to 767-200/300/300F/400ER Airplanes with Ipeco part number
series 3A090 and 3A258 Captain's and First Officer's powered seats, line numbers 161 and on,
in 1 Group. The Variable Numbers and Group information for the applicable airplanes is given
below.
NOTE: The Variable Number table below includes all affected airplanes up to Line Number 1187.
Affected airplanes after Line Number 1187 will be added to the service bulletin's
MyBoeingFleet.com (MBF) "get effectivity" result when they are added to the MBF Fleet
Profile Page.
DESCRIPTIONCONFIGURATIONGROUP
767-200/300/300F/400ER Airplanes equipped with powered Ipeco
Captain's and First Officer's seats part number series 3A090 and
3A258.
-1
Airplane Models:
767-200, 767-300, 767-300F, 767-400ER
GroupVariable Number
1VA713 - VA719
1VE121 - VE126
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GroupVariable Number
1VE141 - VE152
1VF071 - VF072
1VF091 - VF093
1VF161 - VF162
1VF251
1VK081 - VK113
1VK131 - VK133
1VK145 - VK148
1VK161 - VK164
1VK171
1VL806 - VL807
1VL871 - VL873
1VL891 - VL900
1VN151 - VN158
1VN163 - VN168
1VN191 - VN198
1VN211 - VN212
1VN221 - VN225
1VN231 - VN234
1VN301 - VN314
1VN671 - VN672
1VN681 - VN691
1VN931 - VN936
1VQ001 - VQ021
1VQ071 - VQ086
1VR051 - VR060
1VR084
1VR086 - VR089
1VR106 - VR109
1VR251
1VR260
1VR293 - VR294
1VR401
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GroupVariable Number
1VR421 - VR423
1VR426
1VS136 - VS137
1VS231
1VS261 - VS263
1VS273 - VS274
1VS336 - VS337
1VS391 - VS392
1VS466 - VS472
1VS546 - VS549
1VS701 - VS736
1VS861
1VS911 - VS912
1VS916
1VS931 - VS933
1VS951 - VS954
1VS961 - VS969
1VS971 - VS975
1VS981 - VS984
1VT021
1VT031 - VT033
1VT501
1VT521 - VT523
1VT531 - VT533
1VT541 - VT546
1VT551 - VT552
1VT556 - VT629
1VW851
2. 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 for the recommended action.
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Part Number
3A090-0025-01-1
3A090-0026-01-1
3A090-0077-01-1
3A090-0077-02-1
3A090-0078-01-1
3A090-0078-02-1
3A258-0007-01-1
3A258-0008-01-1
3A258-0041-01-1
3A258-0042-01-1
B. Concurrent Requirements
The service bulletin(s) listed below must be done before or at the same time as this service bulletin:
DescriptionService BulletinCompany
Captain's and First Officer's seat manual
override cable adjustment check.
Ipeco SB 098-25-03 Issue 1
(a)(b)
Ipeco
Captain's and First Officer's seat manual
override cable adjustment check.
Ipeco SB 210-25-04 Issue 1
(c)(d)
Ipeco
Captain's and First Officer's seat manual
override cable adjustment check.
Ipeco SB 258-25-08 Issue 4
(e)(f)
Ipeco
(a) Applicable to airplanes with Captain's seat part number 3A090-0025-01-1 installed.
(b) Applicable to airplanes with First Officer's seat part number 3A090-0026-01-1 installed.
(c) Applicable to airplanes with Captain's seat part numbers 3A090-077-01-1 or 3A090-
0077-02-1 installed.
(d) Applicable to airplanes with First Officer's seat part numbers 3A090-0078-01-1 or 3A090-
0078-02-1 installed.
(e) Applicable to airplanes with Captain's seat part numbers 3A258-0007-01-1 or 3A258-
0041-01-1 installed.
(f) Applicable to airplanes with First Officer's seat part numbers 3A258-0008-01-1 or 3A258-
0042-01-1 installed.
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C. Reason
Accomplishment of this service bulletin will make sure that Captain's and First Officer's seats do not
have un-commanded movement due to an improperly adjusted cable for the manual release lever. If
this service bulletin is not done, the manual control lever cable could be incorrectly adjusted which
could result in its clutch mechanism (dogs) not engaging correctly and cause an un-commanded seat
movement. An un-commanded seat movement during a critical part of a flight, such as take-off or
landing could cause a flight control obstruction or unintended flight control input which could result in
the loss of the ability to control the airplane.
A 747 operator reported that during a takeoff, the First Officer's seat unlocked from it's seat tracks and
moved aft. The first officer was unable to control the airplane and the captain took over the controls to
avoid a rejected takeoff. The unlocking of the seat from the seat tracks was caused by actuator damage
which was a result of incorrect adjustment of the seats manual release lever cable, allowing the clutch
dogs to only partially engage. Because 767 airplanes use the same seats in the flight compartment,
Boeing has issued this service bulletin to do a one time inspection, and if necessary an adjustment, in
accordance with an Ipeco Service Bulletin. Three Ipeco Service Bulletins have been issued to account
for different part number seats installed. Because of in-service seat interchangeability, operators are
told to inspect the part number of the seats installed and use the applicable Ipeco Service Bulletin.
This service bulletin gives instructions to find the identification of the installed Captain's and First
Officer's seats and to do an inspection, and if necessary an adjustment, of each seat's fore/aft manual
control lever and vertical manual control lever in accordance with an Ipeco Service Bulletin. The
inspection, and if necessary the adjustment of the manual control levers of the Captain's and First
Officer's seats, will make sure that the seats do not have un-commanded seat movement due to
improperly adjusted fore/aft and vertical manual control levers.
Boeing Service Related Problem (SRP) 767-SRP-25-0320 is related to this service bulletin.
Boeing Fleet Team Digest (FTD) 767 FTD 25-13003 is related to this service bulletin.
Revision 1 is sent to add delivered 767 airplanes that had Ipeco powered Captain's and First Officer's
seats installed during production or in retrofit, and all future deliveries with Ipeco powered Captain's
and First Officer's seats to the effectivity of this service bulletin. This revision also adds instructions to
identify specific Captain's and First Officer's seat serial numbers for seat part numbers 3A258-0041-01-1
and 3A258-0042-01-1. And, seat part numbers 3A258-0041-01-2 and 3A258-0042-01-2 were added
to the Serviceable Seat definition. Airplane variable number VR260 is added because it is applicable
to Boeing service bulletin 767-25-0546, and airplane variable numbers VT551 and VT552 are added
because they are applicable to Boeing service bulletin 767-25-0556, the two of which install Ipeco
powered Captain's and First Officer's seats which are subsequently affected by this service bulletin.
Airplane variable number VR401 is added because it was not included in the Original Issue of this
service bulletin. Also, Captain's seat part number 3A090-0077-01-1 and First Officer's seat part number
3A090-0078-01-1, the two of which are specified in Ipeco SB 210-25-04, are added to this service
bulletin. First Officer's seat part numbers 3A090-0078-03-1 and 3A090-0078-05-1, the two of which
were reidentified back to First Officer's seat part number 3A090-0078-02-1, are removed from this
service bulletin.
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D. Description
Get access to the flight compartment. Find the part number of the installed Captain's and First Officer's
seats. If specific seat part numbers are found, find the serial number of those seats. For specific part
numbers and serial numbers of Captain's and First Officer's seats do a Detailed Inspection of the fore/aft
manual control lever and the vertical manual control lever on each seat for looseness in accordance
with the applicable Ipeco Service Bulletin. If a control lever inspection is not within limits, remove the
seat and install a serviceable seat. Do an operational test of each adjusted seat.
NOTE: A serviceable Captain's seat in this service bulletin is defined as seat part number
3A258-0041-01-2, or is a Captain's seat that has done the inspections and all applicable
corrective actions in accordance with the applicable Ipeco service bulletin. A serviceable First
Officer's seat in this service bulletin is defined as seat part number 3A258-0042-01-2, or is a
First Officer's seat that has done the inspections and all applicable corrective actions in
accordance with the applicable Ipeco service bulletin.
Effects of this Revision on airplanes on which the Original Issue was previously done:
None.
The work in this service bulletin is done in the maintenance zone(s) given below.
Affected Maintenance Zones
ZoneModel
211, 212767-200, 767-300, 767-300F,
767-400ER
E. Compliance
The Federal Aviation Administration (FAA) will possibly release an Airworthiness Directive related to
this service bulletin. The Airworthiness Directive will make the compliance tasks and times given in this
service bulletin mandatory.
Boeing recommends that the inspection, and all applicable corrective actions, given in this service
bulletin be done within 72 months after the Original Issue date of this service bulletin.
F. Approval
This service bulletin was examined by the Federal Aviation Administration (FAA). The changes specified
in this service bulletin 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 service bulletin and its approval were based on
the airplane in its original Boeing delivery configuration or as modified by other approved Boeing
changes.
If an airplane has a non-Boeing modification or repair that affects a component or system also affected
by this service bulletin, the operator is responsible for obtaining appropriate regulatory agency approval
before incorporating this service bulletin.
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### Page 17

G. Manpower
The table below shows an estimate of the task hours necessary to do this service bulletin for each
airplane. This estimate is for direct labor only, done by an experienced crew. Adjust the estimate with
operator task hour data if necessary. The estimate does not include lost time. These are some examples
of lost time:
• Time to adjust to the workplace
• Time to schedule the work
• Time to inspect the work
• Time to cure the materials
• Time to make the parts
• Time to find the tools.
Elapsed
Hours
Task HoursNumber of
Persons
Task
0.050.051Open Access
0.200.201FIGURE 1
0.500.501Removal of the Captain's Seat (a)
0.500.501Installation of the Captain's Seat (b)
0.500.501Removal of the First Officer's Seat (a)
0.500.501Installation of the First Officer's Seat (b)
0.250.251Operational Test of the Captain's Seat (c)
0.250.251Operational Test of the First Officer's Seat (c)
0.050.051Close Access
(d)(d)TOTAL FOR EACH AIRPLANE
(a) Only necessary if it is not possible to adjust the seat with the seat installed.
(b) Only necessary if the seat was removed.
(c) Only necessary if the seat was adjusted in accordance with the applicable Ipeco Service
Bulletin.
(d) The total task hours and elapsed hours are not given as the work necessary for each
airplane is variable.
The time to do the inspection and adjustment in accordance with Ipeco SB 098-25-03, Ipeco SB
210-25-04 and Ipeco SB 258-25-08 is not included.
H. Weight and Balance Changes
None.
I. Electrical Load Data
Not changed.
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J. References
1. Existing Data:
a. Boeing Service Related Problem (SRP) 767-SRP-25-0320
b. Service Bulletin Index D624T001
c. 767 Aircraft Maintenance Manual (AMM) 25-11-01
d. 767 Fleet Team Digest (FTD) 25-13003
e. Ipeco Service Bulletin 098-25-03, 210-25-04, 258-25-08
NOTE: The supplier was told to send copies of the service bulletins to each operator.
2. Data Supplied with this Service Bulletin:
None.
3. Installation Drawings Used in the Preparation of this Service Bulletin:
None.
K. Publications Affected
1. Publications:
None.
2. Damage Tolerance Based Structural Inspections:
Boeing has evaluated the repairs and/or changes in this service bulletin for effects on Fatigue
Critical Structure (FCS) and for changes to Damage Tolerance Inspections (DTI) required in the
Maintenance Program. This service bulletin does not affect FCS, therefore DTIs are not necessary.
L. Interchangeability and Intermixability of Parts
Accomplishment of this service bulletin does not affect interchangeability or intermixability of parts.
M. Software Accomplishment Summary
Not affected.
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2.    MATERIAL INFORMATION
A. Material - Price and Availability
None.
B. Industry Support Information
Boeing warranty remedies are not available for the inspection and adjustment given in this service
bulletin.
C. Parts Necessary for Each Airplane
1. Kits/Parts
None.
2. Parts and Materials Supplied by the Operator
None.
3. Parts Modified and Reidentified
None.
4. Parts Removed and Not Replaced
None.
D. Parts Necessary to Change Spares
None.
E. Special Tooling - Price and Availability
None.
F. Special Tooling Necessary to do this Service Bulletin
No special tools or equipment are necessary to do the change in this service bulletin. But, maintenance
and overhaul tools in the manuals given in Paragraph 1.J., References, can be necessary. Examine
operator tool supply to make sure all necessary tools are available.
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BLANK PAGE

### Page 21

3.    ACCOMPLISHMENT INSTRUCTIONS
A. GENERAL INFORMATION
KEEP THE WORK AREA, WIRES AND ELECTRICAL BUNDLES CLEAN OF
METAL PARTICLES OR CONTAMINATION WHEN YOU USE TOOLS. UNWANTED
MATERIAL, METAL PARTICLES OR CONTAMINATION CAUGHT IN WIRE
BUNDLES CAN CAUSE DAMAGE TO THE BUNDLES. DAMAGED WIRE BUNDLES
CAN CAUSE SPARKS OR OTHER ELECTRICAL DAMAGE.
CAUTION
NOTE: 1. Manual titles are referred to by acronyms. Refer to Paragraph 1.J., References, for
definition of the acronyms.
2. Obey all of the warnings and cautions given in the specified manual sections.
3. Unless shown differently, these dimensions and tolerances are used:
– Linear dimensions are in inches
– Tolerance on linear dimensions, other than rivet and bolt edge margins, is plus
or minus 0.03 inch
– Tolerance on rivet and bolt edge margin is plus or minus 0.05 inch
– Angular tolerance is plus or minus 2 degrees
– Hole dimensions for standard solid rivets and fasteners are in Structural Repair
Manual (SRM) Chapter 51
– Torque Values:
— Values for airframe maintenance tasks are included in Chapter 20 of 767
Aircraft Maintenance Manual (AMM).
— Non-standard torque values for maintenance tasks are included in the
applicable installation step.
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.
6. This service bulletin includes functional test procedures for the systems changed by
this service bulletin. More functional tests can possibly be necessary in accordance
with standard maintenance practices because of interruption to other airplane systems.
7. Use of colors in Figures is based on guidance from the ATA e-Business Program
(ATA) iSpec 2200.
8. The compliance times for the actions in Paragraph 3.B., WORK INSTRUCTIONS
are in Paragraph 1.E., Compliance.
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9. A Detailed Inspection is defined as: An intensive examination of a specific item,
installation, or assembly to detect damage, failure, or irregularity. This could include
tactile assessment in which a component or assembly can be checked for
tightness/security. Available lighting is normally supplemented with a direct source
of good lighting at an intensity deemed appropriate. Inspection aids such as mirrors,
magnifying lenses, etc. may be necessary. Surface cleaning and elaborate procedures
may be required.
B. WORK INSTRUCTIONS
1. Get access to the flight compartment.
2. Inspect to find the identification of the installed Captain's and First Officer's seats in accordance
with FIGURE 1.
NOTE: If the identification of the Captain's and First Officer's seat that is installed on the airplane
can be determined by review of maintenance documentation, then it is not necessary to
do the FIGURE 1 inspection.
a. If the installed Captain's seat has part number 3A258-0041-01-2, no further action is required.
b. If the installed Captain's seat has part number 3A258-0041-01-1 and does not have a serial
number identified by the effectivity of Ipeco SB 258-25-08 Issue 4, no further action is required.
c. For all the other Captain's seat part numbers and Captain's seat part number 3A258-0041-01-1
that has a serial number identified by the effectivity of Ipeco SB 258-25-08 Issue 4, do a
Detailed Inspection of the fore/aft manual control lever and the vertical manual control lever
of the Captain's seat for looseness in accordance with the applicable Ipeco Service Bulletin.
Table 1 lists the applicable Ipeco Service Bulletin for each Captain's seat part number.
Table 1 - Captain's Seat Part Numbers and Applicable Ipeco Service Bulletins
Applicable Ipeco Service
Bulletin
Boeing Part NumberIpeco Part Number
Ipeco SB 098-25-03 Issue 1S232T303-3033A090-0025-01-1
Ipeco SB 210-25-04 Issue 1S232T303-4033A090-0077-01-1
S232T303-4053A090-0077-02-1
Ipeco SB 258-25-08 Issue 4S232T311-33A258-0007-01-1
S232T311-1033A258-0041-01-1
(1) If the movement at the end of the control cable for the fore/aft or vertical manual control
lever is not within the limits given in the applicable Ipeco Service Bulletin, do the steps
that follow:
(a) Remove the Captain's seat. Refer to 767 AMM 25-11-01 as an accepted procedure.
NOTE: Operators can choose not to remove the Captain's seat if there is sufficient
access to adjust the Captain's seat in accordance with the applicable Ipeco
Service Bulletin with the seat installed.
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(b) Install a serviceable Captain's seat. Refer to 767 AMM 25-11-01 as an accepted
procedure.
NOTE: A serviceable Captain's seat in this service bulletin is defined as seat part
number 3A258-0041-01-2, or is a Captain's seat that has done the
inspections and all applicable corrective actions in accordance with the
applicable Ipeco service bulletin.
(2) If the movement at the end of the control cable for the fore/aft and vertical manual control
levers is within the limits given in the applicable Ipeco Service Bulletin, no more work is
necessary on the Captain's seat.
d. If the installed First Officer's seat has part number 3A258-0042-01-2, no further action is
required.
e. If the installed First Officer's seat has part number 3A258-0042-01-1 and does not have a
serial number identified by the effectivity of Ipeco SB 258-25-08 Issue 4, no further action is
required.
f. For all the other First Officer's seat part numbers and First Officer's seat part number
3A258-0042-01-1 that has a serial number identified by the effectivity of Ipeco SB 258-25-08
Issue 4, do a Detailed Inspection of the fore/aft manual control lever and the vertical manual
control lever of the First Officer's seat for looseness in accordance with the applicable Ipeco
Service Bulletin. Table 2 lists the applicable Ipeco Service Bulletin for each First Officer's seat
part number.
Table 2 - First Officer's Seat Part Numbers and Applicable Ipeco Service Bulletins
Applicable Ipeco Service
Bulletin
Boeing Part NumberIpeco Part Number
Ipeco SB 098-25-03 Issue 1S232T303-3043A090-0026-01-1
Ipeco SB 210-25-04 Issue 1S232T303-4043A090-0078-01-1
S232T303-4063A090-0078-02-1
Ipeco SB 258-25-08 Issue 4S232T311-43A258-0008-01-1
S232T311-1043A258-0042-01-1
(1) If the movement at the end of the control cable for the fore/aft or vertical manual control
lever is not within the limits given in the applicable Ipeco Service Bulletin, do the steps
that follow:
(a) Remove the First Officer's seat. Refer to 767 AMM 25-11-01 as an accepted
procedure.
NOTE: Operators can choose not to remove the First Officer's seat if there is
sufficient access to adjust the First Officer's seat in accordance with the
applicable Ipeco Service Bulletin with the seat installed.
(b) Install a serviceable First Officer's seat. Refer to 767 AMM 25-11-01 as an accepted
procedure.
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NOTE: A serviceable First Officer's seat in this service bulletin is defined as seat
part number 3A258-0042-01-2, or is a First Officer's seat that has done the
inspections and all applicable corrective actions in accordance with the
applicable Ipeco service bulletin.
(2) If the movement at the end of the control cable for the fore/aft and vertical manual control
levers is within the limits given in the applicable Ipeco Service Bulletin, no more work is
necessary on the First Officer's seat.
3. For each Captain's and First Officer's seat that had it's fore/aft manual control lever adjusted, do
the functional test that follows. If the Captain's or First Officer's seat fails the test, do corrective
actions and repeat the test until the test of the Captain's and First Officer's seat is passed.
a. Make sure there is no power supply to the seat.
b. While sitting in the seat and with the seat back fully upright, operate the fore/aft manual control
lever.
c. Move the seat to the aft most position and release the control lever.
d. Make sure that the seat locks in the aft most position.
e. Operate the fore/aft manual control lever.
f. Move the seat to the forward most position and release the control lever.
g. Make sure that the seat locks in the forward most position.
4. For each Captain's and First Officer's seat that had it's vertical manual control lever adjusted, do
the functional test that follows. If the Captain's or First Officer's seat fails the test, do corrective
actions and repeat the test until the test of the Captain's and First Officer's seat is passed.
a. Make sure there is no power supply to the seat.
b. While sitting in the seat and with the seat back fully upright, operate the vertical manual control
lever.
c. Make sure that the seat locks in the highest position.
d. Operate the vertical manual control lever.
e. Move the seat to the lowest position and release the control lever.
f. Make sure that the seat locks in the lowest position.
5. Put the airplane back to a serviceable condition.
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### Page 25 (OCR)

BOEING SERVICE BULLETIN 767-25-0539
CAPTAIN'S SEAT
TYPICAL
LEFT SIDE VIEW
FIRST OFFICER'S SEAT
(TYPICAL)
(LEFT SIDE VIEW)
2304530
FIGURE 1: FLIGHT COMPARTMENT SEATS - SEAT IDENTIFICATION
(SHEET 1 OF 2)
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### Page 26

The step numbers shown below agree with the numbers shown in the circle symbols in the figure. The QTY
numbers shown below are the number of parts necessary for each airplane.
More DataQtyIdentificationNameTaskStep
(a)1-Captain's SeatInspect1
(a)1-First Officer's SeatInspect2
(a) Inspect the nameplate located on the rear face of the seat base to find the identification (part number
and, if necessary, serial number) of the installed seat.
FIGURE 1: FLIGHT COMPARTMENT SEATS - SEAT IDENTIFICATION
(SHEET 2 OF 2)
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