# Boeing Alert Service Bulletin 757-29A0066: 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 757-29A0066](https://openairdocs.org/service-documents/boeing/757-29a0066.md)
- Title as filed: U.S. DOT/FAA - SB-757-29A0066-01
- Pages: 26
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- Page: https://openairdocs.org/service-documents/boeing/757-29a0066/file/faaa088e13d0

## Text

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### Page 1

Commercial 
Airplanes
757
Service Bulletin
ALERT
Number: 757-29A0066
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Unpublished Work - All Rights Reserved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.
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3.0

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BOEING SERVICE BULLETIN 757-29A0066
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Table of Contents
Revision Transmittal Sheet ............................................ 5
Summary ...................................................... 7
1. PLANNING INFORMATION ........................................ 1 1
A. Effectivity ............................................... 1 1
1. Airplanes ............................................ 1 1
2. Spares Affected ........................................ 1 5
B. Concurrent Requirements ...................................... 1 5
C. Reason ................................................ 1 5
D. Description .............................................. 1 6
E. Compliance .............................................. 1 6
F. Approval ............................................... 1 7
G. Manpower .............................................. 1 7
H. Weight and Balance Changes .................................... 1 7
I. Electrical Load Data ......................................... 1 8
J. References .............................................. 1 8
1. Existing Data: ......................................... 1 8
2. Data supplied with this Service Bulletin: ........................... 1 8
3. Installation Drawings Used in the Preparation of this Service Bulletin: ........... 1 8
K. Publications Affected ........................................ 1 8
L. Interchangeability and Intermixability of Parts ........................... 1 8
2. MATERIAL INFORMATION ........................................ 1 9
A. Material - Price and Availability ................................... 1 9
B. Industry Support Information .................................... 1 9
C. Parts Necessary For Each Airplane ................................. 1 9
1. Kits/Parts: ........................................... 1 9
2. Parts and Materials Supplied by the Operator: ........................ 1 9
3. Parts Modified and Reidentified: ............................... 1 9
4. Parts Removed and Not Replaced: .............................. 1 9
D. Parts Necessary to Change Spares ................................. 1 9
E. Special Tooling - Price and Availability ............................... 1 9
F. Special Tooling Necessary to do this Service Bulletin ....................... 1 9
3. ACCOMPLISHMENT INSTRUCTIONS .................................. 2 1
A. GENERAL INFORMATION ..................................... 2 1
B. WORK INSTRUCTIONS ....................................... 2 2
FIGURE 1: RAM AIR TURBINE (RAT) HUB ASSEMBLY REPLACEMENT ............... 2 4
Appendix A: FORM FOR OPERATOR FEEDBACK ............................ 2 6
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ALERTALERT
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Commercial 
Airplanes
757
Service Bulletin
ALERT
Revision Transmittal SheetNumber: 757-29A0066Original 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 NA001 thru NA028, NA191 thru NA199, NA201 thru NA239, NA301 thru NA302, NA304 thru NA305,
NA341 thru NA352, NA391 thru NA399, NA401 thru NA408, NA441 thru NA447, NA501 thru NA560, NA565
thru NA586, NB001 thru NB004, NB021 thru NB023, NB036 thru NB041, NB051 thru NB053, NB061 thru NB073,
NB131 thru NB140, NB143 thru NB148, NB161 thru NB162, NB166 thru NB168, NB201 thru NB204, NB221
thru NB228, NB230, NB236, NB239, NB261 thru NB267, NB291 thru NB299, NB301 thru NB302, NB311 thru
NB312, NB321 thru NB331, NB421 thru NB438, NB446, NB451 thru NB454, NB501 thru NB523, NB561, NB571,
NB581 thru NB583, NC001 thru NC033, NC041 thru NC042, NC051 thru NC052, NC056 thru NC062, NC066
thru NC084, NC091 thru NC094, NC151, NC161, NC901 thru NC915, NC921 thru NC950, NC971 thru NC972,
ND001 thru ND003, ND005 thru ND007, ND011 thru ND025, ND041 thru ND059, ND111 thru ND113, ND161
thru ND199, ND201 thru ND203, ND221 thru ND225, ND241 thru ND248, ND301 thru ND322, ND401, ND891,
ND895, NE001 thru NE002, NE004 thru NE008, NE011 thru NE023, NE039 thru NE088, NE091 thru NE094,
NE141 thru NE150, NE161 thru NE177, NE202 thru NE204, NE301 thru NE302, NE311 thru NE325, NJ001
thru NJ004, NJ031 thru NJ032, NJ551 thru NJ555, NL001 thru NL002, NL006 thru NL017, NL101 thru NL109,
NL141, NL601 thru NL616, NN001 thru NN002, NN051 thru NN052, NP901 thru NP904, NS601 thru NS616,
NT001 thru NT009, NT201 thru NT202, NT231 thru NT234, NT237 thru NT240, NT242, NT245 thru NT248,
NT281 thru NT289, NT341 thru NT347, NT351 thru NT360, NT371 thru NT373, NT375 thru NT379, NT381 thru
NT386, NT401 thru NT409, NT411 thru NT412, NT426 thru NT427, NT431 thru NT432, NT436 thru NT438,
NT441 thru NT442, NT446, NT701 thru NT769, NT791 thru NT796, NT861 thru NT862, NT881 thru NT885,
NT901 thru NT916, NT971 thru NT985, NU031 thru NU038, NU701 thru NU705, NU721 thru NU728, and NU731
thru NU732 are added to Group 1 of the service bulletin effectivity.
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REASON FOR REVISION
This revision is sent to add all 757 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: 757-200CB and 757-300 airplanes are added to the effectivity paragraph.
– Compliance: Notice of Proposed 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 to add airplanes.
– Paragraph 1.B., Concurrent requirements: Hamilton Sundstrand SB 730814-29-12 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 Notice of Proposed
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.
REVISION HISTORY
January 02, 2007Original Issue:
March 08, 2010Revision 1:
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BOEING SERVICE BULLETIN 757-29A0066
ALERTALERT

### Page 7

Commercial 
Airplanes
757
Service Bulletin
ALERT
SummaryNumber: 757-29A0066Original 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 730814-29-12, dated November 30, 2005. Replace the RAT hub
assembly if it is on the Hamilton Sundstrand recall list.
Boeing Service Related Problem (SRP) 757-SRP-29-0073 is related to this service bulletin.
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757-29A0066Revision 1: March 08, 2010
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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 730814-29-12, 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 730814-29-12, 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
All 757-200/-200CB/-200PF/-300 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.
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BOEING SERVICE BULLETIN 757-29A0066
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### Page 9 (OCR)

BOEING SERVICE BULLETIN 757-29A0066
ALERT  ALERT
RAT
COMPARTMENT
DOOR
RAT
STRUT
RAT COMPARTMENT DOOR
-INSPECT RAM AIR TURBINE (RAT) HUB ASSEMBLY
IN ACCORDANCE WITH HAMILTON SUNDSTRAND SERVICE
BULLETIN 730814-29-12
-IF THE SERIAL NUMBER IS ON THE HAMILTON SUNDSTRAND  FWD MAINBD
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
J70483
Original Issue: January 02, 2007
Revision 1: March 08, 2010  757-29A0066
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10 of 26
BOEING SERVICE BULLETIN 757-29A0066
ALERTALERT
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Commercial 
Airplanes
757
Service Bulletin
ALERT
Number: 757-29A0066
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 D624N001 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 730814-29-12, dated November 30, 2005.
NOTE: The RAT hub assembly identified in Hamilton Sundstrand SB 730814-29-12, 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
All 757-200/-200CB/-200PF/-300 Airplanes.-1
Airplane Models:
757-200, 757-200CB, 757-200PF, 757-300
GroupVariable Number
1NA001 - NA028
1NA191 - NA199
1NA201 - NA239
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GroupVariable Number
1NA301 - NA305
1NA341 - NA352
1NA391 - NA399
1NA401 - NA408
1NA441 - NA447
1NA501 - NA586
1NB001 - NB004
1NB021 - NB023
1NB036 - NB041
1NB051 - NB053
1NB061 - NB073
1NB079
1NB131 - NB148
1NB161 - NB162
1NB166 - NB168
1NB201 - NB204
1NB221 - NB228
1NB230
1NB236
1NB239
1NB261 - NB267
1NB291 - NB299
1NB301 - NB302
1NB311 - NB312
1NB321 - NB331
1NB421 - NB438
1NB446
1NB451 - NB454
1NB501 - NB523
1NB561
1NB571
1NB581 - NB583
1NC001 - NC033
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GroupVariable Number
1NC041 - NC042
1NC051 - NC052
1NC056 - NC062
1NC066 - NC084
1NC091 - NC094
1NC151
1NC161
1NC901 - NC951
1NC971 - NC974
1ND001 - ND007
1ND011 - ND059
1ND111 - ND113
1ND161 - ND199
1ND201 - ND203
1ND221 - ND225
1ND241 - ND248
1ND301 - ND322
1ND401
1ND891
1ND895
1NE001 - NE008
1NE011 - NE088
1NE091 - NE094
1NE141 - NE150
1NE161 - NE177
1NE201 - NE204
1NE301 - NE302
1NE311 - NE325
1NJ001 - NJ004
1NJ031 - NJ032
1NJ551 - NJ555
1NL001 - NL002
1NL006 - NL017
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GroupVariable Number
1NL101 - NL109
1NL141
1NL601 - NL616
1NN001 - NN002
1NN051 - NN052
1NP901 - NP904
1NS601 - NS616
1NT001 - NT009
1NT201 - NT202
1NT231 - NT234
1NT237 - NT240
1NT242
1NT245 - NT248
1NT281 - NT289
1NT341 - NT347
1NT351 - NT360
1NT371 - NT373
1NT375 - NT379
1NT381 - NT386
1NT401 - NT409
1NT411 - NT412
1NT426 - NT427
1NT431 - NT432
1NT436 - NT438
1NT441 - NT442
1NT446
1NT701 - NT769
1NT791 - NT796
1NT861 - NT862
1NT881 - NT885
1NT901 - NT916
1NT971 - NT985
1NU031 - NU038
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GroupVariable Number
1NU701 - NU705
1NU721 - NU728
1NU731 - NU732
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
730814-29-12, 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 730814-29-12, dated November 30, 2005. Replace
the RAT hub assembly if it is on the Hamilton Sundstrand recall list.
Boeing Service Related Problem (SRP) 757-SRP-29-0073 is related to this service bulletin.
BOEING PROPRIETARY -
Copyright © Unpublished Work - See page 1 for details.
Original Issue: January 02, 2007
757-29A0066Revision 1: March 08, 2010
15 of 26
BOEING SERVICE BULLETIN 757-29A0066
ALERTALERT

### Page 16

Revision 1 is sent to add all 757 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 730814-29-12, 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 730814-29-12, 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
198757-200, 757-200CB, 757-
200PF, 757-300
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 730814-29-12, 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.
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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 necessary only 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 730814-29-12,
dated November 30, 2005 is not included.
H. Weight and Balance Changes
None.
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I. Electrical Load Data
Not changed.
J. References
1. Existing Data:
a. Boeing Service Related Problem (SRP) 757-SRP-29-0073
b. Federal Aviation Administration (FAA) Notice of Proposed Rule Making 2007-NM-223-AD
c. 757 Aircraft Maintenance Manual (AMM) 29-21-00, 29-21-01, 29-21-15, 32-00-15, 32-00-20
d. Hamilton Sundstrand Service Bulletin 730814-29-12, 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.
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2.    MATERIAL INFORMATION
A. Material - Price and Availability
Refer to Hamilton Sundstrand SB 730814-29-12, 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 730814-29-12, dated November 30, 2005.
3. Parts Modified and Reidentified:
Refer to Hamilton Sundstrand SB 730814-29-12, dated November 30, 2005.
NOTE: Examine your spares supply for Hamilton Sundstrand P/N 733785 series RAT hub
assemblies that have serial numbers given in Hamilton Sundstrand SB 730814-29-12,
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
730814-29-12, dated November 30, 2005.
4. Parts Removed and Not Replaced:
None.
D. Parts Necessary to Change Spares
Refer to Hamilton Sundstrand SB 730814-29-12, 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.
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### Page 21

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 757 Structural
Repair Manual, Chapter 51, Alternate fasteners are given in 757 Structural Repair
Manual Chapter 51 and Boeing Drawing 65-88700.
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.
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B. WORK INSTRUCTIONS
1. Install the landing gear downlocks. Refer to 757 AMM 32-00-20 as an accepted procedure.
2. Open the door for the right wheel well and install door locks. Refer to 757 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 757 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 730814-29-12, 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 757 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 730814-29-12, 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 730814-29-12, 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 to Hamilton Sundstrand for rework and test in
accordance with Hamilton Sundstrand SB 730814-29-12, dated November 30, 2005.
(3) Adjust the RAT speed sensor. Refer to 757 AMM 29-21-15 as an accepted procedure.
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(4) Do a functional test of the RAT Pump and Drive system. Refer to 757 AMM 29-21-00,
"System Test - RAT Hydraulic Pump and Drive System" as an accepted procedure.
(5) Retract the RAT. Refer to 757 AMM 29-21-00 as an accepted procedure.
(6) Put the airplane back to a serviceable condition.
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### Page 24 (OCR)

BOEING SERVICE BULLETIN 757-29A0066
ALERT  ALERT
RAT
COMPARTMENT
DOOR  RAT
STRUT
FUD MINBD
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 -  757-29A0066
Copyright © Unpublished Work - See page 1 for details.  24 of 26

### Page 25

MORE DATAQTYIDENTIFICATIONNAMETASKSTEP
Refer to 757 AMM 29-21-
01 as an accepted proce-
dure. (a)
1733785Ram Air Turbine
hub assembly
Remove1
Refer to 757 AMM 29-21-
01 as an accepted proce-
dure. (b)
1733785Ram 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 730814-29-12, 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)
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### Page 26 (OCR)

BOEING SERVICE BULLETIN 757-29A0066
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 757-29A0066, PARAGRAPH 3.B.4.
THE RAT HUB ASSEMBLY AS GIVEN IN THE RECALL LIST OF HAMILTON
SUNDSTRAND SERVICE BULLETIN 730814-29-12 WAS NOT FOUND TO BE
INSTALLED.
Send the completed form to:
BOEING COMMERCIAL AIRPLANE GROUP
ATTENTION: MANAGER, AIRLINE SUPPORT  U87400
Appendix A: FORM FOR OPERATOR FEEDBACK
(SHEET 1 OF 1)
Original Issue: January 02, 2007
Revision 1 March 08, 2010  757-29A0066
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