### 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 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. 9E991 ECCN: 

## BOEING PROPRIETARY, CONFIDENTIAL, AND/OR TRADE SECRET Copyright © 2010 The Boeing Company Unpublished Work - All Rights Reserved Boeing claims copyright in each page of this document only to the extent that the page contains copyrightable subject matter. Boeing also claims copyright in this document as a compilation and/or collective work. This document includes proprietary information owned by The Boeing Company and/or one or more third parties. Treatment of the document and the information it contains is governed by contract with Boeing. For more information, contact The Boeing Company, P.O. Box 3707, Seattle, Washington 98124. Boeing, the Boeing signature, the Boeing symbol, 707, 717, 727, 737, 747, 757, 767, 777, 787, Dreamliner, BBJ, DC-8, DC-9, DC-10, KC-10, KDC-10, MD-10, MD-11, MD-80, MD-88, MD-90, P-8A, Poseidon and the Boeing livery are all trademarks owned by The Boeing Company; and no trademark license is granted in connection with this document unless provided in writing by Boeing.

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: June 24, 2010 757-29-0069 1 of 19 2.0BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: June 24, 2010 757-29-0069 2 of 19 **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

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: June 24, 2010 757-29-0069 3 of 19 **BOEING SERVICE BULLETIN 757-29-0069**BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: June 24, 2010 757-29-0069 4 of 19 **BOEING SERVICE BULLETIN 757-29-0069**

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.

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: June 24, 2010 757-29-0069 5 of 19**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.

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: June 24, 2010 757-29-0069 6 of 19 **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.
**DESCRIPTION CONFIGURATION**  **GROUP** All 757-200/200CB/200PF/300 airplanes.

- 1

Airplane Models: 757-200, 757-200CB, 757-200PF, 757-300 **Group Variable Number**  1 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

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: June 24, 2010 757-29-0069 7 of 19**Group Variable Number**  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 NC041 - NC042 1 NC051 - NC052 1 NC056 - NC062 1 NC066 - NC084 1 NC091 - NC094 1 NC151

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: June 24, 2010 757-29-0069 8 of 19 **BOEING SERVICE BULLETIN 757-29-0069 Group**  **Variable Number** 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 NL101 - NL109 1 NL141 1 NL601 - NL616 1 NN001 - NN002 1 NN051 - NN052 1 NP901 - NP904

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: June 24, 2010 757-29-0069 9 of 19 **BOEING SERVICE BULLETIN 757-29-0069 Group**  **Variable Number** 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 NU701 - NU705 1 NU721 - NU728 1 NU731 - NU732

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: June 24, 2010 757-29-0069 10 of 19 **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: **Description Service Bulletin**  **Company** This service bulletin gives instructionsto 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.

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: June 24, 2010 757-29-0069 11 of 19 **BOEING SERVICE BULLETIN 757-29-0069 Affected Maintenance Zones**  **Zone Model**  198 757-200, 757-200CB, 757- 200PF, 757-300 **E. Compliance Table 1: RAM AIR HUB ASSEMBLY INSPECTION AND BALANCE WASHER RETENTION SCREWS RE**  **PLACEMENT Repeat Interval**  **(Not to Exceed) Compliance Time (Whichever**  **Occurs First) Action**  **Condition**

- Within 2 years after the original issue date ofthis service bulletin Before the nextback-drive operation. (a)Do a general visual inspection of affected RAThub 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.

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: June 24, 2010 757-29-0069 12 of 19 **BOEING SERVICE BULLETIN 757-29-0069 Elapsed Hours**  **Task Hours Number of Persons**  **Task** 0.25 0.25 1 Open Access 0.02 0.02 1 Extend RAT 0.08 0.08 1 FIGURE 1 0.05 0.05 1 Retract RAT 0.25 0.25 1 Close Access 0.65 (a) 0.65 (a) TOTAL FOR EACH AIRPLANE(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: Elapsed Hours**  **Task Hours Number of Persons**  **Task** 1.00 2.00 2 Remove RAT Assem- bly 1.00 2.00 2 Install RAT Assembly 2.00 4.00 TOTAL FOR EACH AIRPLANE
**Additional Times if the RAT Hub is Removed and Installed: Elapsed Hours**  **Task Hours Number of Persons**  **Task** 0.50 0.50 1 Remove RAT Hub Assembly 0.50 0.50 1 Install RAT Hub As- sembly 1.00 1.00 TOTAL FOR EACH AIRPLANE **H. Weight and Balance Changes** None. **I. Electrical Load Data** Not changed.

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: June 24, 2010 757-29-0069 13 of 19 **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.

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: June 24, 2010 757-29-0069 14 of 19 **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.

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: June 24, 2010 757-29-0069 15 of 19 **BOEING SERVICE BULLETIN 757-29-0069**BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: June 24, 2010 757-29-0069 16 of 19 **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:

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: June 24, 2010 757-29-0069 17 of 19 **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.

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: June 24, 2010 757-29-0069 18 of 19 **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.
**MORE DATA QTY**  **IDENTIFICATION NAME**  **TASK STEP**  for part number and serial number. 1

- RAM AIR TURBINE HUB ASSEMBLY Inspect 1

**FIGURE 1: RAM AIR TURBINE HUB ASSEMBLY PART NUMBER AND SERIAL NUMBER INSPECTION. (SHEET 1 OF 1)** 

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: June 24, 2010 757-29-0069 19 of 19 **BOEING SERVICE BULLETIN 757-29-0069**