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.

ECCN: 9E991

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Unpublished Work - All Rights Reserved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,

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3.0
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BOEING SERVICE BULLETIN 757-29A0066

ALERT ALERT

BLANK PAGE
Table of Contents

Revision Transmittal Sheet ............................................ 5

Summary ...................................................... 7

1. PLANNING INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

A. Effectivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

1. Airplanes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

2. Spares Affected . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

B. Concurrent Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

C. Reason . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

D. Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

E. Compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

F. Approval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

G. Manpower . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

H. Weight and Balance Changes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

I. Electrical Load Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

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

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: RAM AIR TURBINE (RAT) HUB ASSEMBLY REPLACEMENT . . . . . . . . . . . . . . . 24

Appendix A: FORM FOR OPERATOR FEEDBACK . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

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BOEING SERVICE BULLETIN 757-29A0066

ALERT ALERT

BLANK PAGE
Commercial 

Airplanes 757

Service Bulletin

ALERT

Revision Transmittal Sheet 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 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

Original Issue: January 02, 2007

Revision 1: March 08, 2010

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BOEING SERVICE BULLETIN 757-29A0066

ALERT ALERT
Commercial 

Airplanes 757

Service Bulletin

ALERT

Summary 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.

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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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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BOEING SERVICE BULLETIN 757-29A0066

ALERT ALERT

BLANK PAGE
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.

GROUP CONFIGURATION DESCRIPTION

1 - All 757-200/-200CB/-200PF/-300 Airplanes.

Airplane Models:

757-200, 757-200CB, 757-200PF, 757-300

Variable Number Group

NA001 - NA028 1

NA191 - NA199 1

NA201 - NA239 1

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Variable Number Group

NA301 - NA305 1

NA341 - NA352 1

NA391 - NA399 1

NA401 - NA408 1

NA441 - NA447 1

NA501 - NA586 1

NB001 - NB004 1

NB021 - NB023 1

NB036 - NB041 1

NB051 - NB053 1

NB061 - NB073 1

NB079 1

NB131 - NB148 1

NB161 - NB162 1

NB166 - NB168 1

NB201 - NB204 1

NB221 - NB228 1

NB230 1

NB236 1

NB239 1

NB261 - NB267 1

NB291 - NB299 1

NB301 - NB302 1

NB311 - NB312 1

NB321 - NB331 1

NB421 - NB438 1

NB446 1

NB451 - NB454 1

NB501 - NB523 1

NB561 1

NB571 1

NB581 - NB583 1

NC001 - NC033 1

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BOEING SERVICE BULLETIN 757-29A0066

ALERT ALERT
Variable Number Group

NC041 - NC042 1

NC051 - NC052 1

NC056 - NC062 1

NC066 - NC084 1

NC091 - NC094 1

NC151 1

NC161 1

NC901 - NC951 1

NC971 - NC974 1

ND001 - ND007 1

ND011 - ND059 1

ND111 - ND113 1

ND161 - ND199 1

ND201 - ND203 1

ND221 - ND225 1

ND241 - ND248 1

ND301 - ND322 1

ND401 1

ND891 1

ND895 1

NE001 - NE008 1

NE011 - NE088 1

NE091 - NE094 1

NE141 - NE150 1

NE161 - NE177 1

NE201 - NE204 1

NE301 - NE302 1

NE311 - NE325 1

NJ001 - NJ004 1

NJ031 - NJ032 1

NJ551 - NJ555 1

NL001 - NL002 1

NL006 - NL017 1

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BOEING SERVICE BULLETIN 757-29A0066

ALERT ALERT
Variable Number Group

NL101 - NL109 1

NL141 1

NL601 - NL616 1

NN001 - NN002 1

NN051 - NN052 1

NP901 - NP904 1

NS601 - NS616 1

NT001 - NT009 1

NT201 - NT202 1

NT231 - NT234 1

NT237 - NT240 1

NT242 1

NT245 - NT248 1

NT281 - NT289 1

NT341 - NT347 1

NT351 - NT360 1

NT371 - NT373 1

NT375 - NT379 1

NT381 - NT386 1

NT401 - NT409 1

NT411 - NT412 1

NT426 - NT427 1

NT431 - NT432 1

NT436 - NT438 1

NT441 - NT442 1

NT446 1

NT701 - NT769 1

NT791 - NT796 1

NT861 - NT862 1

NT881 - NT885 1

NT901 - NT916 1

NT971 - NT985 1

NU031 - NU038 1

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BOEING SERVICE BULLETIN 757-29A0066

ALERT ALERT
Variable Number Group

NU701 - NU705 1

NU721 - NU728 1

NU731 - NU732 1

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:

Company Service Bulletin Description

This SB contains the serial numbers of

the suspect RAT hub assemblies.

Hamilton Sundstrand SB

730814-29-12, dated November

30, 2005.

Hamilton Sundstrand

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

Revision 1: March 08, 2010 757-29A0066

15 of 26

BOEING SERVICE BULLETIN 757-29A0066

ALERT ALERT
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

Model Zone

757-200, 757-200CB, 757- 198

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.

Number of Per- Task-Hours Elapsed Hours

sons

Task

Access 1 0.25 0.25

Inspection 1 0.25 0.25

Replacement 2 4.00 2.00

Close Up 1 0.25 0.25

Test (b) 2 0.50 0.25

TOTAL FOR EACH AIRPLANE (a) (a)

(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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ALERT ALERT
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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ALERT ALERT

BLANK PAGE
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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ALERT ALERT
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)

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STEP TASK NAME IDENTIFICATION QTY MORE DATA

Refer to 757 AMM 29-21-

01 as an accepted procedure. (a)

Ram Air Turbine 733785 1

hub assembly

1 Remove

Refer to 757 AMM 29-21-

01 as an accepted procedure. (b)

Ram Air Turbine 733785 1

hub assembly

2 Install (New)

(a) Return the Ram Air Turbine (RAT) hub assembly to Hamilton Sundstrand for rework and test in accordance 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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Appendix A: FORM FOR OPERATOR FEEDBACK

(SHEET 1 OF 1)

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ALERT ALERT