# Boeing Alert Service Bulletin 767-29A0110: Revision 1

- Rights: © The Boeing Company. Filed by the FAA in regulations.gov docket FAA-2008-0561; AD 2015-05-01 incorporates this document by reference. Not covered by OpenAirDocs’ CC0 dedication.
- Document: [Boeing Alert Service Bulletin 767-29A0110](https://openairdocs.org/service-documents/boeing/767-29a0110.md)
- Title as filed: U.S. DOT/FAA - SB-767-29A0110-01
- Pages: 30
- PDF: https://openairdocs.org/files/sha256/42/2d/422d7fef2206b3b23b92ec6c5a8bd1ff3f7d8c74e1701b0af66593c958f180f6
- Page: https://openairdocs.org/service-documents/boeing/767-29a0110/file/422d7fef2206

## Text

Some pages are OCR from a scan. OCR can misread letters and numbers. Each page's text from the PDF; open the PDF at a page with #page=N.

### Page 1

Commercial 
Airplanes
767
Service Bulletin
ALERT
Number: 767-29A0110
Original Issue: January 02, 2007
Revision 1: March 08, 2010
ATA System: 2921
SUBJECT: HYDRAULIC POWER - Ram Air Turbine (RAT) System - RAT Hub Assembly Inspection
and Replacement
Export of this technology is controlled under the United States Export Administration Regulations (EAR) (15
CFR 730-774). 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 © 2007 The Boeing Company
Unpublished Work - All Rights Reserved
Boeing claims copyright in each page of this document only to the extent that the page contains copyrightable
subject matter. Boeing also claims copyright in this document as a compilation and/or collective work.
This document includes proprietary information owned by The Boeing Company and/or one or more third parties.
Treatment of the document and the information it contains is governed by contract with Boeing. For more
information, contact The Boeing Company, P.O. Box 3707, Seattle, Washington 98124.
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, KDC-10, MD-10, MD-11, MD-80, MD-88, MD-90, P-8A, Poseidon and the
Boeing livery 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.
BOEING PROPRIETARY -
Copyright © Unpublished Work - See page 1 for details.
Original Issue: January 02, 2007
767-29A0110Revision 1: March 08, 2010
1 of 30
3.0

### Page 2

BOEING PROPRIETARY -
Copyright © Unpublished Work - See page 1 for details.
Original Issue: January 02, 2007
767-29A0110Revision 1: March 08, 2010
2 of 30
BOEING SERVICE BULLETIN 767-29A0110
ALERTALERT
BLANK PAGE

### Page 3

Table of Contents
Revision Transmittal Sheet ............................................ 5
Summary ...................................................... 9
1. PLANNING INFORMATION ........................................ 1 3
A. Effectivity ............................................... 1 3
1. Airplanes ............................................ 1 3
2. Spares Affected ........................................ 1 9
B. Concurrent Requirements ...................................... 1 9
C. Reason ................................................ 1 9
D. Description .............................................. 2 0
E. Compliance .............................................. 2 0
F. Approval ............................................... 2 1
G. Manpower .............................................. 2 1
H. Weight and Balance Changes .................................... 2 1
I. Electrical Load Data ......................................... 2 2
J. References .............................................. 2 2
1. Existing Data: ......................................... 2 2
2. Data supplied with this Service Bulletin: ........................... 2 2
3. Installation Drawings Used in the Preparation of this Service Bulletin: ........... 2 2
K. Publications Affected ........................................ 2 2
L. Interchangeability and Intermixability of Parts ........................... 2 2
2. MATERIAL INFORMATION ........................................ 2 3
A. Material - Price and Availability ................................... 2 3
B. Industry Support Information .................................... 2 3
C. Parts Necessary For Each Airplane ................................. 2 3
1. Kits/Parts: ........................................... 2 3
2. Parts and Materials Supplied by the Operator: ........................ 2 3
3. Parts Modified and Reidentified: ............................... 2 3
4. Parts Removed and Not Replaced: .............................. 2 3
D. Parts Necessary to Change Spares ................................. 2 3
E. Special Tooling - Price and Availability ............................... 2 3
F. Special Tooling Necessary to do this Service Bulletin ....................... 2 3
3. ACCOMPLISHMENT INSTRUCTIONS .................................. 2 5
A. GENERAL INFORMATION ..................................... 2 5
B. WORK INSTRUCTIONS ....................................... 2 6
FIGURE 1: RAM AIR TURBINE (RAT) HUB ASSEMBLY REPLACEMENT ............... 2 8
Appendix A: FORM FOR OPERATOR FEEDBACK ............................ 3 0
BOEING PROPRIETARY -
Copyright © Unpublished Work - See page 1 for details.
Original Issue: January 02, 2007
767-29A0110Revision 1: March 08, 2010
3 of 30
BOEING SERVICE BULLETIN 767-29A0110
ALERTALERT

### Page 4

BOEING PROPRIETARY -
Copyright © Unpublished Work - See page 1 for details.
Original Issue: January 02, 2007
767-29A0110Revision 1: March 08, 2010
4 of 30
BOEING SERVICE BULLETIN 767-29A0110
ALERTALERT
BLANK PAGE

### Page 5

Commercial 
Airplanes
767
Service Bulletin
ALERT
Revision Transmittal SheetNumber: 767-29A0110Original Issue: January 02, 2007
Revision 1: March 08, 2010
ATA System: 2921
SUBJECT: HYDRAULIC POWER - Ram Air Turbine (RAT) System - RAT Hub Assembly Inspection
and Replacement
This revision includes all pages of the service bulletin.
COMPLIANCE INFORMATION RELATED TO THIS REVISION
No more work is necessary on airplanes changed in accordance with the original issue of this service bulletin.
Federal Aviation Administration (FAA) Notice of Proposed Rule Making 2007-NM-223-AD, is related to this
service bulletin.
Airplanes VA001 thru VA020, VA301 thru VA315, VA501 thru VA530, VA701 thru VA719, VA801 thru VA810,
VB001 thru VB002, VB051 thru VB055, VB101 thru VB125, VB201 thru VB202, VB251 thru VB253, VB281 thru
VB284, VB301 thru VB302, VB321 thru VB332, VB371 thru VB373, VB401, VB441 thru VB444, VE001 thru
VE003, VE021 thru VE023, VE041 thru VE043, VE061 thru VE069, VE083 thru VE086, VE101 thru VE104,
VE116 thru VE118, VE121 thru VE126, VE141 thru VE148, VE150 thru VE152, VE171 thru VE172, VF001 thru
VF002, VF041 thru VF042, VF051, VF061, VF071 thru VF072, VF091 thru VF093, VF101 thru VF102, VF161
thru VF162, VF171 thru VF172, VF180 thru VF184, VF251, VK001 thru VK016, VK021 thru VK022, VK031 thru
VK046, VK048 thru VK056, VK081 thru VK113, VK131 thru VK133, VK141, VK143 thru VK148, VK161 thru
VK164, VK171, VK181, VK186, VL001 thru VL006, VL011, VL701 thru VL703, VL751 thru VL755, VL806 thru
VL807, VL871 thru VL873, VL891 thru VL900, VL911 thru VL914, VL931 thru VL932, VL941, VN001 thru VN041,
VN051 thru VN064, VN081 thru VN087, VN089 thru VN099, VN111 thru VN117, VN119 thru VN127, VN130
thru VN131, VN133 thru VN137, VN151 thru VN155, VN157 thru VN158, VN163 thru VN164, VN166 thru VN168,
VN171 thru VN174, VN191 thru VN198, VN211 thru VN212, VN221 thru VN225, VN231 thru VN234, VN241
thru VN243, VN251 thru VN255, VN258 thru VN276, VN291 thru VN293, VN301, VN304 thru VN314, VN371
thru VN372, VN376, VN381 thru VN388, VN421 thru VN427, VN436, VN471 thru VN472, VN491 thru VN513,
VN531 thru VN532, VN536 thru VN537, VN541 thru VN542, VN546 thru VN547, VN551, VN556 thru VN557,
VN561 thru VN562, VN631 thru VN638, VN651 thru VN658, VN671 thru VN672, VN676, VN681 thru VN691,
VN732, VN751 thru VN753, VN791 thru VN792, VN811 thru VN813, VN921 thru VN922, VN931 thru VN936,
VN951 thru VN953, VN966 thru VN972, VQ001 thru VQ021, VQ071 thru VQ086, VQ111, VR051 thru VR060,
VR081, VR084, VR086 thru VR089, VR106 thru VR109, VR201 thru VR211, VR251, VR256 thru VR260, VR401,
VR421 thru VR423, VR426, VR441, VR461, VR471 thru VR472, VS051 thru VS056, VS061, VS066 thru VS070,
VS073 thru VS078, VS091 thru VS104, VS111 thru VS113, VS131 thru VS133, VS136 thru VS137, VS176 thru
VS177, VS186 thru VS187, VS196 thru VS203, VS206 thru VS208, VS211, VS216 thru VS217, VS231, VS246
thru VS248, VS261 thru VS263, VS266 thru VS274, VS291 thru VS293, VS301 thru VS303, VS306 thru VS311,
VS316, VS321 thru VS324, VS331 thru VS333, VS336 thru VS337, VS366 thru VS367, VS381 thru VS382,
BOEING PROPRIETARY -
Copyright © Unpublished Work - See page 1 for details.
Original Issue: January 02, 2007
767-29A0110Revision 1: March 08, 2010
5 of 30

### Page 6

VS391 thru VS392, VS401, VS426 thru VS428, VS466 thru VS472, VS486, VS496 thru VS497, VS506 thru
VS507, VS526, VS546 thru VS549, VS701 thru VS736, VS751 thru VS759, VS821 thru VS825, VS841 thru
VS844, VS861, VS881 thru VS883, VS891, VS896, VS901 thru VS912, VS916, VS921 thru VS922, VS931,
VT501, VT511 thru VT513, VT521 thru VT523, VT531 thru VT533, VV001, VW701 thru VW721 and VW851,
are added to Group 1 of the service bulletin effectivity.
REASON FOR REVISION
This revision is sent to add airplanes to the service bulletin effectivity. Since the release of the original issue of
this service bulletin, it has been found that it is possible that some operators could have removed affected Ram
Air Turbines (RAT) or RAT hub assemblies and installed them on other airplanes as they are interchangeable.
This revision also adds an FAA Notice of Proposed Rule Making (NPRM), removes a step from the Work
Instructions and adds maintenance zone information. In addition to these changes, the term "as given in" is
changed to "refer to, as an accepted procedure" for non-FAA approved manuals and "in accordance with" for
FAA approved manuals to comply with the latest SB standards. Figure references are also updated to say "in
accordance with" to comply with the latest SB standards.
These sections are changed:
1. Summary:
– Concurrent Requirements: Is changed to refer to Paragraph 1.B.
– Effectivity: 767-300F and 767-400ER airplanes are added to the effectivity paragraph.
– Compliance: FAA Notice of Propose Rule Making 2007-NM-223-AD is added.
– Manpower: The manpower table is removed.
2. Planning Information:
– Paragraph 1.A.1., Airplanes: The group configuration table is changed as additional airplanes are
added.
– Paragraph 1.B., Concurrent requirements: Hamilton Sundstrand SB 729548-29-15, dated November
30, 2005 is added to the concurrent requirements.
– Paragraph 1.D., Description: A maintenance zone table is added.
– Paragraph 1.E., Compliance: The compliance recommendation is changed and FAA Notice of Propose
Rule Making 2007-NM-223-AD is added.
– Paragraph 1.G., Manpower: Footnote (a) is changed to clarify that the work necessary on each airplane
is variable. The word 'required' is changed to 'necessary' in footnote(b).
– Paragraph 1.K., Publications Affected: A damage tolerance paragraph is added.
3. Accomplishment Instructions:
– Paragraph 3.B., Work Instructions: The original Step 4.b.3 is removed because installation of the new
RAT hub assembly is already given in a previous step. The subsequent step numbers are adjusted.
– Figure 1: The title is updated to better describe the change.
Vertical lines are put on the left edge of each page, except in Paragraph 1.A., Effectivity, to show the location
of important changes.
Pages with no vertical lines have no important changes.
BOEING PROPRIETARY -
Copyright © Unpublished Work - See page 1 for details.
Original Issue: January 02, 2007
767-29A0110Revision 1: March 08, 2010
6 of 30
BOEING SERVICE BULLETIN 767-29A0110
ALERTALERT

### Page 7

REVISION HISTORY
January 02, 2007Original Issue:
March 08, 2010Revision 1:
BOEING PROPRIETARY -
Copyright © Unpublished Work - See page 1 for details.
Original Issue: January 02, 2007
767-29A0110Revision 1: March 08, 2010
7 of 30
BOEING SERVICE BULLETIN 767-29A0110
ALERTALERT

### Page 8

BOEING PROPRIETARY -
Copyright © Unpublished Work - See page 1 for details.
Original Issue: January 02, 2007
767-29A0110Revision 1: March 08, 2010
8 of 30
BOEING SERVICE BULLETIN 767-29A0110
ALERTALERT
BLANK PAGE

### Page 9

Commercial 
Airplanes
767
Service Bulletin
ALERT
SummaryNumber: 767-29A0110Original Issue: January 02, 2007
Revision 1: March 08, 2010
ATA System: 2921
SUBJECT: HYDRAULIC POWER - Ram Air Turbine (RAT) System - RAT Hub Assembly Inspection
and Replacement
THIS BULLETIN 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 SERVICE BULLETIN TO
THE NEW OPERATOR. IF APPLICABLE SPARES HAVE BEEN SOLD, SEND THIS SERVICE BULLETIN TO
THE NEW OWNER.
CONCURRENT REQUIREMENTS
Refer to Paragraph 1.B., Concurrent Requirements.
BACKGROUND
This service bulletin gives instructions to inspect and replace the Ram Air Turbine (RAT) hub assembly to prevent
a possible fracture of the RAT hub assembly counterweight. A fractured RAT hub assembly counterweight will
cause an overspeed condition which could result in turbine blade separation, airplane structural damage, possible
injury to passengers, and result in an inoperative RAT. The RAT provides hydraulic power for the operation of
the primary flight controls in cases where both engines are shut down in flight. If this service bulletin is not done,
an inoperative RAT will cause the loss of hydraulic power to the primary flight controls and will impact the
continued safe operation of the airplane.
There are two counterweights installed in the RAT hub assembly which are used to regulate the RAT turbine
speed. A Ground test of the RAT will show the performance, but does not test the RAT speed through the full
range of operation. In flight RAT extensions can generate higher speeds of operation, which will result in higher
loads on the counterweight.
Hamilton Sundstrand told Boeing that the counterweights in some RATs could be under strength and fracture
when the RAT is extended in flight. Counterweights have fractured at speeds within the RAT's range of operation
during laboratory tests conducted by Hamilton Sundstrand. As a result, Hamilton Sundstrand requested a recall
of several RAT hub assemblies with serial numbers directly before and after the fractured test unit. Equivalent
tests were done on RAT counterweights from different manufactured lots. These tests have all resulted in no
fault found.
This service bulletin tells affected operators to access the RAT and inspect the hub assembly serial number in
accordance with Hamilton Sundstrand SB 729548-29-15, dated November 30, 2005. Replace the RAT hub
assembly if it is on the Hamilton Sundstrand recall list.
Boeing Service Related Problem (SRP) 767-SRP-29-0073 is related to this service bulletin.
BOEING PROPRIETARY -
Copyright © Unpublished Work - See page 1 for details.
Original Issue: January 02, 2007
767-29A0110Revision 1: March 08, 2010
9 of 30

### Page 10

ACTION
Get access to the right wheel well. Extend the Ram Air Turbine (RAT). Do a general visual inspection of the
RAT hub assembly at the intervals given in Paragraph 1.E., Compliance. Inspect for serial numbers that are on
the recall list in accordance with Hamilton Sundstrand SB 729548-29-15, dated November 30, 2005.
1. If the RAT hub assembly serial number is not on the recall list, retract the RAT and put the airplane back
to a serviceable condition.
2. If the RAT hub assembly serial number is on the recall list, replace the RAT hub assembly at the intervals
given in Paragraph 1.E., Compliance. Return the removed RAT hub assembly to Hamilton Sundstrand for
rework and test in accordance with Hamilton Sundstrand SB 729548-29-15, dated November 30, 2005. Do
a functional test of the RAT Pump and Drive system for the replaced, reworked RAT. Put the airplane back
to a serviceable condition.
EFFECTIVITY
767-200/-300/-300F/-400ER Airplanes. Refer to Paragraph 1.A.1., Airplanes for the list of affected airplanes.
COMPLIANCE
Federal Aviation Administration (FAA) Notice of Proposed Rule Making FAA NPRM 2007-NM-223-AD, is related
to this service bulletin.
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.
BOEING PROPRIETARY -
Copyright © Unpublished Work - See page 1 for details.
Original Issue: January 02, 2007
767-29A0110Revision 1: March 08, 2010
10 of 30
BOEING SERVICE BULLETIN 767-29A0110
ALERTALERT

### Page 11 (OCR)

BOEING SERVICE BULLETIN 767-29A0110
ALERT  ALERT
RAT
COMPARTMENT
DOOR
RAT
RAT COMPARTMENT DOOR  STRUT
-INSPECT RAM AIR TURBINE (RAT) HUB ASSEMBLY
IN ACCORDANCE WITH HAMILTON SUNDSTRAND SERVICE
BULLETIN 729548-29-15
-IF THE SERIAL NUMBER IS ON THE HAMILTON SUNDSTRAND
SERVICE BULLETIN RECALL LIST, INSTALL NEW RAT HUB
ASSEMBLY SUPPLIED BY HAMILTON SUNDSTRAND.
-IF THE SERIAL NUMBER IS NOT ON THE RECALL LIST,
PUT THE AIRPLANE BACK TO A SERVICEABLE CONDITION
J92917
Original Issue: January 02, 2007
Revision 1: March 08, 2010  767-29A0110
BOEING PROPRIETARY -
Copyright © Unpublished Work - See page 1 for details.  11 of 30

### Page 12

BOEING PROPRIETARY -
Copyright © Unpublished Work - See page 1 for details.
Original Issue: January 02, 2007
767-29A0110Revision 1: March 08, 2010
12 of 30
BOEING SERVICE BULLETIN 767-29A0110
ALERTALERT
BLANK PAGE

### Page 13

Commercial 
Airplanes
767
Service Bulletin
ALERT
Number: 767-29A0110
Original Issue: January 02, 2007
Revision 1: March 08, 2010
ATA System: 2921
SUBJECT: HYDRAULIC POWER - Ram Air Turbine (RAT) System - RAT Hub Assembly Inspection
and Replacement
THIS BULLETIN 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 SERVICE BULLETIN TO
THE NEW OPERATOR. IF APPLICABLE SPARES HAVE BEEN SOLD, SEND THIS SERVICE BULLETIN TO
THE NEW OWNER.
1.    PLANNING INFORMATION
A. Effectivity
1. Airplanes
Refer to Service Bulletin Index Document D624T001 Part 3 for Airplane Variable Number, Line
Number, and Serial Number data.
This service bulletin is for the airplanes shown below with Ram Air Turbine (RAT) hub assemblies
as shown in Hamilton Sundstrand SB 729548-29-15, dated November 30, 2005.
NOTE: The RAT hub assembly identified in Hamilton Sundstrand SB 729548-29-15, dated
November 30, 2005 may no longer be installed in the identified airplanes due to
maintenance action that could have been previously done on the hub assemblies..
DESCRIPTIONCONFIGURATIONGROUP
767-200/-300/-300F/-400ER Airplanes.-1
Airplane Models:
767-200, 767-300, 767-300F, 767-400ER
GroupVariable Number
1VA001 - VA020
1VA301 - VA315
1VA501 - VA530
BOEING PROPRIETARY -
Copyright © Unpublished Work - See page 1 for details.
Original Issue: January 02, 2007
767-29A0110Revision 1: March 08, 2010
13 of 30

### Page 14

GroupVariable Number
1VA701 - VA719
1VA801 - VA810
1VB001 - VB002
1VB051 - VB055
1VB101 - VB125
1VB201 - VB202
1VB251 - VB253
1VB281 - VB284
1VB301 - VB302
1VB321 - VB332
1VB371 - VB373
1VB401
1VB441 - VB444
1VE001 - VE003
1VE021 - VE023
1VE041 - VE043
1VE061 - VE069
1VE083 - VE086
1VE101 - VE104
1VE116 - VE118
1VE121 - VE126
1VE141 - VE152
1VE171 - VE172
1VF001 - VF002
1VF041 - VF042
1VF051
1VF061 - VF062
1VF071 - VF072
1VF091 - VF093
1VF101 - VF102
1VF161 - VF162
1VF171 - VF172
1VF180 - VF184
BOEING PROPRIETARY -
Copyright © Unpublished Work - See page 1 for details.
Original Issue: January 02, 2007
767-29A0110Revision 1: March 08, 2010
14 of 30
BOEING SERVICE BULLETIN 767-29A0110
ALERTALERT

### Page 15

GroupVariable Number
1VF251
1VK001 - VK016
1VK021 - VK022
1VK031 - VK056
1VK081 - VK113
1VK131 - VK133
1VK141 - VK148
1VK161 - VK164
1VK171
1VK181
1VK186
1VL001 - VL006
1VL011
1VL701 - VL703
1VL751 - VL755
1VL806 - VL807
1VL871 - VL873
1VL891 - VL900
1VL911 - VL914
1VL931 - VL932
1VL941
1VN001 - VN041
1VN051 - VN064
1VN081 - VN099
1VN111 - VN127
1VN130 - VN137
1VN151 - VN158
1VN163 - VN168
1VN171 - VN174
1VN191 - VN198
1VN211 - VN212
1VN221 - VN225
1VN231 - VN234
BOEING PROPRIETARY -
Copyright © Unpublished Work - See page 1 for details.
Original Issue: January 02, 2007
767-29A0110Revision 1: March 08, 2010
15 of 30
BOEING SERVICE BULLETIN 767-29A0110
ALERTALERT

### Page 16

GroupVariable Number
1VN241 - VN243
1VN251 - VN276
1VN291 - VN293
1VN301 - VN314
1VN371 - VN372
1VN376
1VN381 - VN388
1VN421 - VN427
1VN436
1VN471 - VN472
1VN491 - VN513
1VN531 - VN532
1VN536 - VN537
1VN541 - VN542
1VN546 - VN547
1VN551
1VN556 - VN557
1VN561 - VN562
1VN631 - VN638
1VN651 - VN658
1VN671 - VN672
1VN676
1VN681 - VN691
1VN731 - VN732
1VN751 - VN753
1VN791 - VN792
1VN811 - VN813
1VN921 - VN922
1VN931 - VN936
1VN951 - VN953
1VN966 - VN972
1VQ001 - VQ021
1VQ071 - VQ086
BOEING PROPRIETARY -
Copyright © Unpublished Work - See page 1 for details.
Original Issue: January 02, 2007
767-29A0110Revision 1: March 08, 2010
16 of 30
BOEING SERVICE BULLETIN 767-29A0110
ALERTALERT

### Page 17

GroupVariable Number
1VQ111
1VR051 - VR060
1VR081
1VR084
1VR086 - VR089
1VR106 - VR109
1VR201 - VR211
1VR251
1VR256 - VR260
1VR401
1VR421 - VR423
1VR426
1VR441
1VR461
1VR471 - VR472
1VS051 - VS056
1VS061
1VS066 - VS070
1VS073 - VS078
1VS091 - VS104
1VS111 - VS113
1VS131 - VS133
1VS136 - VS137
1VS176 - VS177
1VS186 - VS187
1VS196 - VS203
1VS206 - VS208
1VS211
1VS216 - VS217
1VS231
1VS246 - VS248
1VS261 - VS263
1VS266 - VS274
BOEING PROPRIETARY -
Copyright © Unpublished Work - See page 1 for details.
Original Issue: January 02, 2007
767-29A0110Revision 1: March 08, 2010
17 of 30
BOEING SERVICE BULLETIN 767-29A0110
ALERTALERT

### Page 18

GroupVariable Number
1VS291 - VS293
1VS301 - VS303
1VS306 - VS311
1VS316
1VS321 - VS324
1VS331 - VS333
1VS336 - VS337
1VS366 - VS367
1VS381 - VS382
1VS391 - VS392
1VS401
1VS426 - VS428
1VS466 - VS472
1VS486
1VS496 - VS497
1VS506 - VS507
1VS526
1VS546 - VS549
1VS701 - VS736
1VS751 - VS759
1VS821 - VS825
1VS841 - VS844
1VS861
1VS881 - VS883
1VS891
1VS896
1VS901 - VS912
1VS916
1VS921 - VS922
1VS931
1VT501
1VT511 - VT513
1VT521 - VT523
BOEING PROPRIETARY -
Copyright © Unpublished Work - See page 1 for details.
Original Issue: January 02, 2007
767-29A0110Revision 1: March 08, 2010
18 of 30
BOEING SERVICE BULLETIN 767-29A0110
ALERTALERT

### Page 19

GroupVariable Number
1VT531 - VT533
1VV001
1VW701 - VW721
1VW851
2. Spares Affected
Examine your spares supply for the parts or components identified in Paragraph 2.C., Parts
Necessary for Each Airplane. If any parts or components are found, refer to Paragraph 2.C. for
the recommended use.
B. Concurrent Requirements
The service bulletin listed below must be used before or at the same time as this service bulletin:
DescriptionService BulletinCompany
This SB contains the serial numbers of
the suspect RAT hub assemblies.
Hamilton Sundstrand SB
729548-29-15, dated November
30, 2005.
Hamilton Sund-
strand
C. Reason
This service bulletin gives instructions to inspect and replace the Ram Air Turbine (RAT) hub assembly
to prevent a possible fracture of the RAT hub assembly counterweight. A fractured RAT hub assembly
counterweight will cause an overspeed condition which could result in turbine blade separation, airplane
structural damage, possible injury to passengers, and result in an inoperative RAT. The RAT provides
hydraulic power for the operation of the primary flight controls in cases where both engines are shut
down in flight. If this service bulletin is not done, an inoperative RAT will cause the loss of hydraulic
power to the primary flight controls and will impact the continued safe operation of the airplane.
There are two counterweights installed in the RAT hub assembly which are used to regulate the RAT
turbine speed. A Ground test of the RAT will show the performance, but does not test the RAT speed
through the full range of operation. In flight RAT extensions can generate higher speeds of operation,
which will result in higher loads on the counterweight.
Hamilton Sundstrand told Boeing that the counterweights in some RATs could be under strength and
fracture when the RAT is extended in flight. Counterweights have fractured at speeds within the RAT's
range of operation during laboratory tests conducted by Hamilton Sundstrand. As a result, Hamilton
Sundstrand requested a recall of several RAT hub assemblies with serial numbers directly before and
after the fractured test unit. Equivalent tests were done on RAT counterweights from different
manufactured lots. These tests have all resulted in no fault found.
This service bulletin tells affected operators to access the RAT and inspect the hub assembly serial
number in accordance with Hamilton Sundstrand SB 729548-29-15, dated November 30, 2005. Replace
the RAT hub assembly if it is on the Hamilton Sundstrand recall list.
Boeing Service Related Problem (SRP) 767-SRP-29-0073 is related to this service bulletin.
BOEING PROPRIETARY -
Copyright © Unpublished Work - See page 1 for details.
Original Issue: January 02, 2007
767-29A0110Revision 1: March 08, 2010
19 of 30
BOEING SERVICE BULLETIN 767-29A0110
ALERTALERT

### Page 20

Revision 1 is sent to add airplanes to the service bulletin effectivity. Since the release of the original
issue of this service bulletin, it has been found that it is possible that some operators could have removed
affected Ram Air Turbines (RAT) or RAT hub assemblies and installed them on other airplanes as they
are interchangeable. In addition, Revision 1 also adds an FAA Notice of Proposed Rule Making (NPRM),
removes a step from the Work Instructions and adds maintenance zone information. In addition to
these changes, the term "as given in" is changed to "refer to, as an accepted procedure" for non-FAA
approved manuals and "in accordance with" for FAA approved manuals to comply with the latest SB
standards. Figure references are also updated to say "in accordance with" to comply with the latest
SB standards.
D. Description
Get access to the right wheel well. Extend the Ram Air Turbine (RAT). Do a general visual inspection
of the RAT hub assembly at the intervals given in Paragraph 1.E., Compliance. Inspect for serial
numbers that are on the recall list in accordance with Hamilton Sundstrand SB 729548-29-15, dated
November 30, 2005.
1. If the RAT hub assembly serial number is not on the recall list, retract the RAT and put the airplane
back to a serviceable condition.
2. If the RAT hub assembly serial number is on the recall list, replace the RAT hub assembly at the
intervals given in Paragraph 1.E., Compliance. Return the removed RAT hub assembly to Hamilton
Sundstrand for rework and test in accordance with Hamilton Sundstrand SB 729548-29-15, dated
November 30, 2005. Do a functional test of the RAT Pump and Drive system for the replaced,
reworked RAT. Put the airplane back to a serviceable condition.
Revision 1 - No more work is necessary on airplanes changed in accordance with the original issue of
this service bulletin.
The work in this service bulletin is done in the maintenance zone(s) given below.
Affected Maintenance Zones
ZoneModel
198767-200, 767-300, 767-300F,
767-400ER
E. Compliance
Boeing recommends that operators do the inspection and replacement in this service bulletin within
24 months from the date on Revision 1 of this service bulletin.
NOTE: In cases where the RAT hub assembly serial number is on the recall list and there is no
replacement RAT hub assembly in stock, put the airplane back to a serviceable condition.
Contact Hamilton Sundstrand for a new RAT hub assembly in accordance with Hamilton
Sundstrand SB 729548-29-15, dated November 30, 2005, Paragraph 1.G. Do the RAT hub
assembly replacement within the above compliance time.
Federal Aviation Administration (FAA) Notice of Proposed Rule Making FAA NPRM 2007-NM-223-AD,
is related to this service bulletin.
BOEING PROPRIETARY -
Copyright © Unpublished Work - See page 1 for details.
Original Issue: January 02, 2007
767-29A0110Revision 1: March 08, 2010
20 of 30
BOEING SERVICE BULLETIN 767-29A0110
ALERTALERT

### Page 21

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.
G. Manpower
The table below shows an estimate of the task-hours necessary to do this change 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 examine the work
— Time to cure the materials
— Time to make the parts
— Time to find the tools.
Elapsed HoursTask-HoursNumber of Per-
sons
Task
0.250.251Access
0.250.251Inspection
2.004.002Replacement
0.250.251Close Up
0.250.502Test (b)
(a)(a)TOTAL FOR EACH AIRPLANE
(a) The total Task-Hours and Elapsed Hours are not given as the work done
on each airplane is variable.
(b) The test is only necessary if replacement of the RAT hub assembly occurs.
This does not include the functional test of the RAT pump and drive system.
The change to the Ram Air Turbine (RAT) hub assembly given in Hamilton Sundstrand SB 729548-29-15,
dated November 30, 2005 is not included.
H. Weight and Balance Changes
None.
BOEING PROPRIETARY -
Copyright © Unpublished Work - See page 1 for details.
Original Issue: January 02, 2007
767-29A0110Revision 1: March 08, 2010
21 of 30
BOEING SERVICE BULLETIN 767-29A0110
ALERTALERT

### Page 22

I. Electrical Load Data
Not changed.
J. References
1. Existing Data:
a. Boeing Service Related Problem (SRP) 767-SRP-29-0073
b. Federal Aviation Administration (FAA) Notice of Proposed Rule Making 2007-NM-223-AD
c. 767 Aircraft Maintenance Manual (AMM) 29-21-00, 29-21-01, 29-21-15, 32-00-15, 32-00-20
d. Hamilton Sundstrand Service Bulletin 729548-29-15, dated November 30, 2005
NOTE: The supplier was told to send copies of the service bulletin 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
Refer to Paragraph 2.C., Parts Necessary for Each Airplane, for interchangeability and intermixability
information.
BOEING PROPRIETARY -
Copyright © Unpublished Work - See page 1 for details.
Original Issue: January 02, 2007
767-29A0110Revision 1: March 08, 2010
22 of 30
BOEING SERVICE BULLETIN 767-29A0110
ALERTALERT

### Page 23

2.    MATERIAL INFORMATION
A. Material - Price and Availability
Refer to Hamilton Sundstrand SB 729548-29-15, dated November 30, 2005.
NOTE: A limited number of Ram Air Turbine (RAT) hub assemblies will be placed in a rotable pool
for operator use. Operators are to contact Hamilton Sundstrand for a replacement unit.
B. Industry Support Information
Boeing warranty remedies are not available for the inspection, and/or repair procedures given in this
service bulletin.
C. Parts Necessary For Each Airplane
1. Kits/Parts:
None.
2. Parts and Materials Supplied by the Operator:
Refer to Hamilton Sundstrand SB 729548-29-15, dated November 30, 2005.
3. Parts Modified and Reidentified:
Refer to Hamilton Sundstrand SB 729548-29-15, dated November 30, 2005.
NOTE: Examine your spares supply for Hamilton Sundstrand P/N 734350 series RAT hub
assemblies that have serial numbers given in Hamilton Sundstrand SB 729548-29-15,
dated November 30, 2005. If hub assemblies on the recall list are found, they should be
sent back to Hamilton Sundstrand in accordance with Hamilton Sundstrand SB
729548-29-15, dated November 30, 2005.
4. Parts Removed and Not Replaced:
None.
D. Parts Necessary to Change Spares
Refer to Hamilton Sundstrand SB 729548-29-15, dated November 30, 2005 for information on parts
necessary to change spares.
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.
BOEING PROPRIETARY -
Copyright © Unpublished Work - See page 1 for details.
Original Issue: January 02, 2007
767-29A0110Revision 1: March 08, 2010
23 of 30
BOEING SERVICE BULLETIN 767-29A0110
ALERTALERT

### Page 24

BOEING PROPRIETARY -
Copyright © Unpublished Work - See page 1 for details.
Original Issue: January 02, 2007
767-29A0110Revision 1: March 08, 2010
24 of 30
BOEING SERVICE BULLETIN 767-29A0110
ALERTALERT
BLANK PAGE

### Page 25

3.    ACCOMPLISHMENT INSTRUCTIONS
A. GENERAL INFORMATION
CAUTION: 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.
NOTE: 1. The instructions identified in Paragraph 3.B., Work Instructions and the Figure(s)
give the recommended sequence of steps. The sequence of steps to do this service
bulletin can be changed.
2. Manual titles are referred to by acronyms. Refer to Paragraph 1.J., References, for
definition of the acronyms.
3. Obey all of the warnings and cautions given in the specified manual sections.
4. For approved fastener and process material substitutions, refer to 767 Structural
Repair Manual, Chapter 51, Alternate fasteners are given in 767 Structural Repair
Manual Chapter 51 and Boeing Drawing 012W6100.
5. A General Visual Inspection is defined as: A visual examination of an interior or
exterior area, installation or assembly to detect obvious damage, failure or irregularity.
This level of inspection is made from within touching distance unless otherwise
specified. A mirror may be necessary to ensure visual access to all surfaces in the
inspection area. This level of inspection is made under normal available lighting
conditions such as daylight, hangar lighting, flashlight or drop-light and may require
removal or opening of access panels or doors. Stands, ladders or platforms may be
required to gain proximity to the area being checked.
6. These work instructions refer to procedures included on 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.
BOEING PROPRIETARY -
Copyright © Unpublished Work - See page 1 for details.
Original Issue: January 02, 2007
767-29A0110Revision 1: March 08, 2010
25 of 30
BOEING SERVICE BULLETIN 767-29A0110
ALERTALERT

### Page 26

B. WORK INSTRUCTIONS
1. Install the landing gear downlocks. Refer to 767 AMM 32-00-20 as an accepted procedure.
2. Open the door for the right wheel well and install door locks. Refer to 767 AMM 32-00-15 as an
accepted procedure.
CAUTION: MAKE SURE THAT THERE ARE NO PERSONS OR EQUIPMENT IN THE RAM AIR
TURBINE (RAT) AREA BEFORE EXTENSION OR RETRACTION OF THE RAT.
MOVEMENT OF THE RAT AND DOOR CAN CAUSE INJURY TO PERSONS OR
DAMAGE TO EQUIPMENT.
3. Extend the Ram Air Turbine (RAT). Refer to 767 AMM 29-21-00 as an accepted procedure.
4. Do a general visual inspection of the RAT hub assembly within the intervals given in Paragraph
1.E., Compliance. Inspect to see if the hub assembly serial number is on the recall list in accordance
with Hamilton Sundstrand SB 729548-29-15, dated November 30, 2005.
a. If the RAT hub assembly serial number is not on the recall list, do the steps that follow:
(1) Retract the RAT. Refer to 767 AMM 29-21-00 as an accepted procedure.
(2) Put the airplane back to a serviceable condition.
NOTE: Operators are requested to notify Boeing if the airplane inspected does not have a
RAT hub assembly installed that is in the serial number range identified in Hamilton
Sundstrand SB 729548-29-15, dated November 30, 2005. Refer to APPENDIX A
for the feedback form.
b. If the RAT hub assembly serial number is on the recall list, do the steps that follow:
(1) Replace the RAT hub assembly within the intervals given in Paragraph 1.E., Compliance
and in accordance with FIGURE 1.
(a) A limited number of Ram Air Turbine (RAT) hub assemblies will be placed in a rotable
pool for operator use. Operators are to contact Hamilton Sundstrand for a replacement
unit in accordance with Hamilton Sundstrand SB 729548-29-15, dated November
30, 2005, Paragraph 1.G.
(b) In cases where there is no replacement RAT hub assembly in stock, put the airplane
back to a serviceable condition. Contact Hamilton Sundstrand for a new RAT hub
assembly and do the replacement within the intervals given in Paragraph 1.E.,
Compliance.
(2) Return the removed RAT hub assembly back to Hamilton Sundstrand for rework and test
in accordance with Hamilton Sundstrand SB 729548-29-15, dated November 30, 2005.
(3) Adjust the RAT speed sensor. Refer to 767 AMM 29-21-15 as an accepted procedure.
BOEING PROPRIETARY -
Copyright © Unpublished Work - See page 1 for details.
Original Issue: January 02, 2007
767-29A0110Revision 1: March 08, 2010
26 of 30
BOEING SERVICE BULLETIN 767-29A0110
ALERTALERT

### Page 27

(4) Do a functional test of the RAT Pump and Drive system. Refer to 767 AMM 29-21-00,
"System Test - RAT Hydraulic Pump and Drive System" as an accepted procedure.
(5) Retract the RAT. Refer to 767 AMM 29-21-00 as an accepted procedure.
(6) Put the airplane back to a serviceable condition.
BOEING PROPRIETARY -
Copyright © Unpublished Work - See page 1 for details.
Original Issue: January 02, 2007
767-29A0110Revision 1: March 08, 2010
27 of 30
BOEING SERVICE BULLETIN 767-29A0110
ALERTALERT

### Page 28 (OCR)

BOEING SERVICE BULLETIN 767-29A0110
ALERT  ALERT
RAT
COMPARTMENT
DOOR
_RAT
STRUT
FWD T
RAT STRUT
HUB ASSEMBLY
RAM AIR TURBINE
(RAT) ASSEMBLY
• FWD
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 this figure.
FIGURE 1: RAM AIR TURBINE (RAT) HUB ASSEMBLY REPLACEMENT
(SHEET 1 OF 2)
Original Issue: January 02, 2007
Revision 1 March 08, 2010  BOEING PROPRIETARY -  767-29A0110
Copyright © Unpublished Work - See page 1 for details.  28 of 30

### Page 29

MORE DATAQTYIDENTIFICATIONNAMETASKSTEP
Refer to 767 AMM 29-21-
01 as an accepted proce-
dure. (a)
1734350Ram Air Turbine
hub assembly
Remove1
Refer to 767 AMM 29-21-
01 as an accepted proce-
dure. (b)
1734350Ram Air Turbine
hub assembly
Install (New)2
(a) Return the Ram Air Turbine (RAT) hub assembly to Hamilton Sundstrand for rework and test in accor-
dance with Hamilton Sundstrand SB 729548-29-15, dated November 30, 2005.
(b) A limited number of RAT hub assemblies will be placed in a rotable pool for operator use. Operators
are to contact Hamilton Sundstrand for a replacement unit.
FIGURE 1: RAM AIR TURBINE (RAT) HUB ASSEMBLY REPLACEMENT
(SHEET 2 OF 2)
BOEING PROPRIETARY -
Copyright © Unpublished Work - See page 1 for details.
Original Issue: January 02, 2007
767-29A0110Revision 1 March 08, 2010
29 of 30
BOEING SERVICE BULLETIN 767-29A0110
ALERTALERT

### Page 30 (OCR)

BOEING SERVICE BULLETIN 767-29A0110
ALERT  ALERT
Subject: HYDRAULIC POWER - Ram Air Turbine (RAT) System - RAT Hub
Assembly Inspection and Replacement.
Operator:  Location:_  Date Completed:
AIRPLANE LINE NUMBER  HAS BEEN INSPECTED IN
ACCORDANCE WITH SERVICE BULLETIN 767-29A0110, PARAGRAPH 3.B.4.
THE RAT HUB ASSEMBLY AS GIVEN IN THE RECALL LIST OF HAMILTON
SUNDSTRAND SERVICE BULLETIN 729548-29-15 WAS NOT FOUND TO BE
INSTALLED.
Send the completed form to:
BOEING COMMERCIAL AIRPLANE GROUP
ATTENTION: MANAGER, AIRLINE SUPPORT  U87401
Appendix A: FORM FOR OPERATOR FEEDBACK
(SHEET 1 OF 1)
Original Issue: January 02, 2007
Revision 1 March 08, 2010  767-29A0110
BOEING PROPRIETARY -
Copyright © Unpublished Work - See page 1 for details.  30 of 30

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain, except the copies of manufacturers’ service documents, which belong to their rights holders.