Commercial 

Airplanes 757

Service Bulletin

SPECIAL ATTENTION

Number: 757-29-0069

Original Issue: June 24, 2010

ATA System: 2921

SUBJECT: HYDRAULIC POWER - Ram Air Turbine System - Ram Air Turbine Hub Assembly

Inspection and Balance Washer Retention Screws Replacement

Export of this technology is controlled under the United States Export Administration Regulations (EAR) (15

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persons from specific countries. The controller of this data has the individual responsibility to abide by all export

laws.

ECCN: 9E991

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Copyright © 2010 The Boeing Company

Unpublished Work - All Rights Reserved

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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.

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2.0
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BOEING SERVICE BULLETIN 757-29-0069

BLANK PAGE
Table of Contents

Summary ...................................................... 5

1. PLANNING INFORMATION ........................................ 7

A. Effectivity ................................................ 7

1. Airplanes ............................................. 7

2. Spares Affected . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

B. Concurrent Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

C. Reason . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

D. Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

E. Compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

F. Approval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

G. Manpower . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

H. Weight and Balance Changes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

I. Electrical Load Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

J. References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

1. Existing Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

2. Data supplied with this Service Bulletin . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

3. Installation Drawings Used in the Preparation of this Service Bulletin . . . . . . . . . . . . 14

K. Publications Affected . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

L. Interchangeability and Intermixability of Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

2. MATERIAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

A. Material - Price and Availability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

B. Industry Support Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

C. Parts Necessary For Each Airplane . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

1. Kits/Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

2. Parts and Materials Supplied by the Operator . . . . . . . . . . . . . . . . . . . . . . . . 15

3. Parts Modified and Reidentified . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

4. Parts Removed and Not Replaced . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

D. Parts Necessary to Change Spares . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

E. Special Tooling - Price and Availability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

F. Special Tooling Necessary to do this Service Bulletin . . . . . . . . . . . . . . . . . . . . . . . 15

3. ACCOMPLISHMENT INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

A. GENERAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

B. WORK INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

FIGURE 1: RAM AIR TURBINE HUB ASSEMBLY PART NUMBER AND SERIAL NUMBER INSPECTION.

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

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BOEING SERVICE BULLETIN 757-29-0069
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BLANK PAGE
Commercial 

Airplanes 757

Service Bulletin

SPECIAL ATTENTION

Summary Number: 757-29-0069

Original Issue: June 24, 2010

ATA System: 2921

SUBJECT: HYDRAULIC POWER - Ram Air Turbine System - Ram Air Turbine Hub Assembly

Inspection and Balance Washer Retention Screws Replacement

BOEING RECOMMENDS THAT EACH OPERATOR EXAMINE THIS SERVICE BULLETIN IMMEDIATELY.

CONCURRENT REQUIREMENTS

Refer to Paragraph 1.B., Concurrent Requirements.

BACKGROUND

This service bulletin is sent to prevent separation of Ram Air Turbine (RAT) balance washers from the RAT hub

assembly during operation. Screws that attach the RAT balance washers could be incorrectly heat treated, which

can cause them to fracture. If this service bulletin is not done, a fracture of a balance washer retention screw

could occur during operation, which can result in the loss of the related balance washer and cause RAT vibration

and can make the RAT unserviceable. Also, loss of the balance washer retention screw head and the balance

washer during back-drive operation on the ground could cause injury to maintenance personnel.

Boeing received a report that some RAT hub assemblies were delivered with balance washer retention screws

that were incorrectly heat treated. The incorrectly heat treated screws are susceptible to fracture/cracking. There

are 59 affected RAT hub assemblies with serial numbers identified in Hamilton Sundstrand SB 730814-29-15.

Accomplishment of this service bulletin gives instructions to do an inspection of the RAT hub assembly to find

the part number and serial number. Instructions are also given to do a general visual inspection of RAT hub

assemblies with affected part numbers and serial numbers for missing balance washers and replace the retention

screws in accordance with Hamilton Sundstrand SB 730814-29-15. Replacement of suspect retention screws

will prevent damage to the RAT caused by the separation of RAT balance washers during flight, or during

back-drive operation on the ground.

Boeing Service Related Problem (SRP) 757-SRP-29-0082 is related to this service bulletin.

ACTION

Get access to the RAT and inspect the RAT hub assembly for part numbers and serial numbers. Do a general

visual inspection of affected RAT hub assemblies for missing balance washers and replace the retention screws

in accordance with Hamilton Sundstrand SB 730814-29-15.

EFFECTIVITY

All 757-200/200CB/200PF/300 Airplanes. Refer to Paragraph 1.A.1., Airplanes, for the list of affected airplanes.

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COMPLIANCE

Refer to Paragraph 1.E., Compliance.

INDUSTRY SUPPORT INFORMATION

Boeing warranty remedies are not available for the actions suggested in this service bulletin. Please refer to the

supplier service bulletin for more information.

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 757-29-0069
Commercial 

Airplanes 757

Service Bulletin

SPECIAL ATTENTION

Number: 757-29-0069

Original Issue: June 24, 2010

ATA System: 2921

SUBJECT: HYDRAULIC POWER - Ram Air Turbine System - Ram Air Turbine Hub Assembly

Inspection and Balance Washer Retention Screws Replacement

BOEING RECOMMENDS THAT EACH OPERATOR EXAMINE THIS SERVICE BULLETIN IMMEDIATELY.

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.

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

NA301 - NA305 1

NA341 - NA352 1

NA391 - NA399 1

NA401 - NA408 1

NA441 - NA447 1

NA501 - NA586 1

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Variable Number Group

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

NC041 - NC042 1

NC051 - NC052 1

NC056 - NC062 1

NC066 - NC084 1

NC091 - NC094 1

NC151 1

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BOEING SERVICE BULLETIN 757-29-0069
Variable Number Group

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

NL101 - NL109 1

NL141 1

NL601 - NL616 1

NN001 - NN002 1

NN051 - NN052 1

NP901 - NP904 1

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BOEING SERVICE BULLETIN 757-29-0069
Variable Number Group

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

NU701 - NU705 1

NU721 - NU728 1

NU731 - NU732 1

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BOEING SERVICE BULLETIN 757-29-0069
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 done at the same time as this service bulletin:

Company Service Bulletin Description

This service bulletin gives instructions

to replace Ram Air Turbine (RAT) balance washer retention screws and identify the hub assembly.

Hamilton Sundstrand SB 730814-29-15,

Original issue.

Hamilton Sundstrand

C. Reason

This service bulletin is sent to prevent separation of Ram Air Turbine (RAT) balance washers from the

RAT hub assembly during operation. Screws that attach the RAT balance washers could be incorrectly

heat treated, which can cause them to fracture. If this service bulletin is not done, a fracture of a balance

washer retention screw could occur during operation, which can result in the loss of the related balance

washer and cause RAT vibration and can make the RAT unserviceable. Also, loss of the balance

washer retention screw head and the balance washer during back-drive operation on the ground could

cause injury to maintenance personnel.

Boeing received a report that some RAT hub assemblies were delivered with balance washer retention

screws that were incorrectly heat treated. The incorrectly heat treated screws are susceptible to

fracture/cracking. There are 59 affected RAT hub assemblies with serial numbers identified in Hamilton

Sundstrand SB 730814-29-15.

Accomplishment of this service bulletin gives instructions to do an inspection of the RAT hub assembly

to find the part number and serial number. Instructions are also given to do a general visual inspection

of RAT hub assemblies with affected part numbers and serial numbers for missing balance washers

and replace the retention screws in accordance with Hamilton Sundstrand SB 730814-29-15.

Replacement of suspect retention screws will prevent damage to the RAT caused by the separation

of RAT balance washers during flight, or during back-drive operation on the ground.

Boeing Service Related Problem (SRP) 757-SRP-29-0082 is related to this service bulletin.

D. Description

Get access to the RAT and inspect the RAT hub assembly for part numbers and serial numbers. Do

a general visual inspection of affected RAT hub assemblies for missing balance washers and replace

the retention screws in accordance with Hamilton Sundstrand SB 730814-29-15.

The work in this service bulletin is done in the maintenance zone(s) given below.

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BOEING SERVICE BULLETIN 757-29-0069
Affected Maintenance Zones

Model Zone

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

200PF, 757-300

E. Compliance

Table 1: RAM AIR HUB ASSEMBLY INSPECTION AND BALANCE WASHER RETENTION SCREWS REPLACEMENT

Repeat Interval

(Not to Exceed)

Compliance Time (Whichever

Occurs First)

Condition Action

Within 2 years -

after the original

issue date of

this service bulletin

Before the next

back-drive operation. (a)

Do a general visual inspection of affected RAT

hub assemblies for missing balance washers and

replace the retention

screws in accordance

with Hamilton Sundstrand

SB 730814-29-15.

All Airplanes

(a) A back-drive operation is used to test the RAT (refer to 757 AMM 29-21-00).

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 tables below show an estimate of the task hours necessary to do the inspection and replacement

for each airplane. This estimate is for direct labor only, done by an experienced crew. Adjust the estimate

with operator task hour data if necessary. The estimate does not include lost time. These are some

examples of lost time:

• Time to adjust to the workplace

• Time to schedule the work

• Time to inspect the work

• Time to cure the materials

• Time to make the parts

• Time to find the tools.

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BOEING SERVICE BULLETIN 757-29-0069
Task Number of Persons Task Hours Elapsed Hours

Open Access 1 0.25 0.25

Extend RAT 1 0.02 0.02

FIGURE 1 1 0.08 0.08

Retract RAT 1 0.05 0.05

Close Access 1 0.25 0.25

TOTAL FOR EACH AIRPLANE 0.65 (a) 0.65 (a)

(a) The total task hours and elapsed hours necessary to do the inspection/replacement in accordance with Hamilton Sundstrand SB 730814-29-15 are not included.

Additional Times if the RAT Assembly is Removed and Installed:

Task Number of Persons Task Hours Elapsed Hours

Remove RAT Assem- 2 2.00 1.00

bly

Install RAT Assembly 2 2.00 1.00

TOTAL FOR EACH AIRPLANE 4.00 2.00

Additional Times if the RAT Hub is Removed and Installed:

Task Number of Persons Task Hours Elapsed Hours

Remove RAT Hub 1 0.50 0.50

Assembly

Install RAT Hub As- 1 0.50 0.50

sembly

TOTAL FOR EACH AIRPLANE 1.00 1.00

H. Weight and Balance Changes

None.

I. Electrical Load Data

Not changed.

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BOEING SERVICE BULLETIN 757-29-0069
J. References

1. Existing Data

a. Boeing Service Related Problem (SRP) 757-SRP-29-0082

b. 757 Aircraft Maintenance Manual (AMM) 29-21-00, 29-21-01, 32-00-15, 32-00-20

c. Hamilton Sundstrand Service Bulletin 730814-29-15

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

Accomplishment of this service bulletin does not affect interchangeability or intermixability of parts.

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BOEING SERVICE BULLETIN 757-29-0069
2. MATERIAL INFORMATION

A. Material - Price and Availability

The operator can supply the parts and materials shown in Paragraph 2.C., Parts Necessary for Each

Airplane, and Paragraph 2.D., Parts Necessary to Change Spares. Refer to Hamilton Sundstrand SB

730814-29-15.

B. Industry Support Information

Boeing warranty remedies are not available for the actions suggested in this service bulletin. Please

refer to the supplier service bulletin for more information.

C. Parts Necessary For Each Airplane

1. Kits/Parts

Refer to Hamilton Sundstrand SB 730814-29-15.

2. Parts and Materials Supplied by the Operator

Refer to Hamilton Sundstrand SB 730814-29-15.

3. Parts Modified and Reidentified

Refer to Hamilton Sundstrand SB 730814-29-15.

4. Parts Removed and Not Replaced

None.

D. Parts Necessary to Change Spares

Refer to Hamilton Sundstrand SB 730814-29-15 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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BOEING SERVICE BULLETIN 757-29-0069

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. 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 enhance visual access to all exposed surfaces

in the inspection area. This level of inspection is made under normally 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.

5. These work instructions refer to procedures included in other Boeing documents.

When the words "refer to" are used and the operator has an accepted alternative

procedure, the accepted alternative procedure can be used. When the words "in

accordance with" are included in the instruction, the procedure in the Boeing document

must be used.

B. WORK INSTRUCTIONS

1. Install 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.

3. Extend the Ram Air Turbine (RAT). Refer to 757 AMM 29-21-00 as an accepted procedure.

4. Inspect the RAT hub assembly for part numbers and serial numbers in accordance with FIGURE

1.

a. If the RAT hub assembly has a part number and serial number identified in Hamilton Sundstrand

SB 730814-29-15, do a general visual inspection for missing balance washers and replace

the retention screws in accordance with Hamilton Sundstrand SB 730814-29-15:

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BOEING SERVICE BULLETIN 757-29-0069
– Where applicable in Hamilton Sundstrand SB 730814-29-15, the RAT assembly or RAT

hub assembly can be removed from the airplane. Refer to 757 AMM 29-21-01 as an

accepted procedure;

– After the RAT hub assembly has been repaired and re-balanced in accordance with

Hamilton Sundstrand SB 730814-29-15, then if removed, install the RAT assembly or

RAT hub assembly on the airplane. Refer to 757 AMM 29-21-01 as an accepted procedure.

b. If the RAT hub assembly does not have a part number and serial number identified in Hamilton

Sundstrand SB 730814-29-15, no more work is necessary on the RAT.

5. Retract the RAT. Refer to 757 AMM 29-21-00 as an accepted procedure.

6. Remove the right wheel well door locks. Refer to 757 AMM 32-00-15 as an accepted procedure.

7. Remove the landing gear downlocks. Refer to 757 AMM 32-00-20 as an accepted procedure.

8. Put the airplane back to a serviceable condition.

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BOEING SERVICE BULLETIN 757-29-0069
The step numbers shown below agree with the numbers shown in the circle symbols in the figure. The QTY

numbers shown below are the number of parts necessary for each airplane.

STEP TASK NAME IDENTIFICATION QTY MORE DATA

for part number and

serial number.

RAM AIR TURBINE - 1

HUB ASSEMBLY

1 Inspect

FIGURE 1: RAM AIR TURBINE HUB ASSEMBLY PART NUMBER AND SERIAL NUMBER INSPECTION.

(SHEET 1 OF 1)

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BOEING SERVICE BULLETIN 757-29-0069