### Commercial **Airplane Group**  

# 757 Service Bulletin **SPECIAL ATTENTION Number: 757-32-0176**  Date: September 10, 2007 Revision 1: October 16, 2008 ATA System: 3245 **SUBJECT:** LANDING GEAR - Nose Wheel Spin Brake - Spring 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. 9E991 ECCN: 

## BOEING PROPRIETARY, CONFIDENTIAL, AND/OR TRADE SECRET Copyright © 2007 The Boeing Company Unpublished Work - All Rights Reserved Boeing claims copyright in each page of this document only to the extent that the page contains copyrightable subject matter.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, MD-10, MD-11, MD-80, MD-88, MD-90, 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BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. September 10, 2007 757-32-0176 Revision 1: October 16, 2008 1 of 55 8.0BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. September 10, 2007 757-32-0176 Revision 1: October 16, 2008 2 of 55 **BOEING SERVICE BULLETIN 757-32-0176**

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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 F. Approval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 G. Manpower . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 H. Weight and Balance Changes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 I. Electrical Load Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 J. References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 1. Existing Data:. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 2. Data supplied with this Service Bulletin: . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 3. Installation Drawings Used in the Preparation of this Service Bulletin: . . . . . . . . . . . 21 K. Publications Affected. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 L. Interchangeability and Intermixability of Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 2. MATERIAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 A. Material - Price and Availability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 B. Industry Support Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 C. Parts Necessary For Each Airplane. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 1. Kits/Parts:. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 2. Parts and Materials Supplied by the Operator: . . . . . . . . . . . . . . . . . . . . . . . . 25 3. Parts Modified and Reidentified:. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 4. Parts Removed and Not Replaced: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 D. Parts Necessary to Change Spares. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 E. Special Tooling - Price and Availability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 F. Special Tooling Necessary to do this Service Bulletin. . . . . . . . . . . . . . . . . . . . . . . 28 3. ACCOMPLISHMENT INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 A. GENERAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 B. WORK INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 FIGURE 1: SPIN BRAKE ASSEMBLY- GENERAL VISUAL INSPECTION . . . . . . . . . . . . . . . . 32 FIGURE 2: SPRING - DETAILED INSPECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 FIGURE 3: SPRING - SPECIAL DETAILED INSPECTION . . . . . . . . . . . . . . . . . . . . . . . . 36 FIGURE 4: SPRING - REPLACEMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 FIGURE 5: SPIN BRAKE ASSEMBLY (COMPOSITE) - REPLACEMENT . . . . . . . . . . . . . . . . 43 FIGURE 6: SPIN BRAKE ASSEMBLY (CRES) - REPLACEMENT . . . . . . . . . . . . . . . . . . . . 47 FIGURE 7: SPIN BRAKE ASSEMBLY (COMPOSITE) - ASSEMBLE . . . . . . . . . . . . . . . . . . 51

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. September 10, 2007 757-32-0176 Revision 1: October 16, 2008 3 of 55 **BOEING SERVICE BULLETIN 757-32-0176**BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. September 10, 2007 757-32-0176 Revision 1: October 16, 2008 4 of 55 **BOEING SERVICE BULLETIN 757-32-0176**

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### Commercial **Airplane Group**  

# 757 Service Bulletin **SPECIAL ATTENTION Revision Transmittal Sheet**  **Number: 757-32-0176** Date: September 10, 2007 Revision 1: October 16, 2008 ATA System: 3245 **SUBJECT:** LANDING GEAR - Nose Wheel Spin Brake - Spring Inspection and Replacement This revision includes all pages of the service bulletin. **COMPLIANCE INFORMATION RELATED TO THIS REVISION** No more work is necessary on the airplanes changed as shown in the original issue of this service bulletin. However, operators must continue to do the inspection detailed at the times given in Paragraph 1.E., Compliance until the newly designed spin brake assemblies made from Corrosion Resistant Steel (CRES) springs or the composite springs are installed. After installation of the new spin brake assemblies that have CRES springs or the composite springs, it is not necessary to do the repeat inspections. **REASON FOR REVISION** This revision is sent to add new Top Kit 012N0045-1 which supplies new spin brake assemblies that have CRES springs. Part 5 of the Work Instructions is updated to add a new Option 3 for operators who want to install the new spin brake assemblies that have CRES springs. Also "spin brake spring arms" is changed to "springs" and "Toe Plate" is changed to "Toe Piece" in all the sections of the service bulletin. Changes to the service bulletin include: — Summary - Background and Action - Instructions are added to install the new spin brake assemblies that have CRES springs as the recommended terminating action to the repeat inspections. — Paragraph 1.C., Reason - Instructions are added to install the new spin brake assemblies that have CRES springs as the recommended terminating action to the repeat inspections. — Paragraph 1.D., Description - Instructions are added to install the new spin brake assemblies that have CRES springs as the recommended terminating action to the repeat inspections. — Paragraph 1.E., Compliance - Compliance Table and Note (c) updated. — Paragraph 1.G., Manpower - Existing tables removed. New table added. — Paragraph 1.J.3., - "Installation Drawings Used in the Preparation of this Service Bulletin" - Installation drawing number 012N0045 added. — Paragraph 1.K., - "Publications Affected" - Reference to 757 Illustrated Parts Catalog (IPC) 32-45 added. — Paragraph 2.A., Material - Price and Availability - New table for the top kit 012N0045-1 added. — Paragraph 2.C.1., Parts Necessary for Each Airplane - New table for the top kit 012N0045-1 added. — Paragraph 2.C.2., Parts and Materials Supplied by the Operator

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. September 10, 2007 757-32-0176 Revision 1: October 16, 2008 5 of 55— Table 1 - Optional part BACS40R014Y050F added. — Table 2 - Table 2 changed to Table 2-1. Optional part BACS40R014Y046F added. New Washer AN960KD516 added. Part number 141N0096-1 and BACB30NM5K14 deleted. Part number 141N0091-13 moved to the new Table 2-2. — New table 3 for Option 3 added. — Paragraph 3.B., Work Instructions - Option 3 added in PART 5 to install the new spin brake assemblies that have CRES springs. Also reference to AMM 32-45-05 added. — Figure 4 - Optional part BACS40R014Y050F added in step 7, 8 and 10. — Figure 5 - Optional part BACS40R014Y046F added in step 13, 14 and 16. Salvaged filler 141N0096-1 deleted. New fillers to be used which are included in the Spin Brake Assembly 141N0091-13. Note (a) updated and Note (c) deleted. — Figure 6 - New figure with steps to install the new spin brake assemblies that have CRES springs. — Figure 7 - New figure with steps to assemble the new spin brake assembly with a composite spring. 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** September 10, 2007 Original Issue: October 16, 2008 Revision 1:

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. September 10, 2007 757-32-0176 Revision 1: October 16, 2008 6 of 55 **BOEING SERVICE BULLETIN 757-32-0176**

### Commercial **Airplane Group**  

# 757 Service Bulletin **SPECIAL ATTENTION Summary**  **Number: 757-32-0176** Date: September 10, 2007 Revision 1: October 16, 2008 ATA System: 3245 **SUBJECT:** LANDING GEAR - Nose Wheel Spin Brake - Spring Inspection and Replacement BOEING RECOMMENDS THAT EACH OPERATOR EXAMINE THIS SERVICE BULLETIN IMMEDIATELY. **CONCURRENT REQUIREMENTS** None. **BACKGROUND** This service bulletin gives instructions to inspect the springs of the nose wheel spin brake assemblies to determine if they are aluminum or composite. Spin brake assemblies fitted with aluminum springs can crack. Operators must inspect the aluminum springs for any crack and replace them if necessary. A crack in the aluminum spring can result in a separation of the aluminum spring from the airplane. If this service bulletin is not done, an aluminum spring could break and separate from the airplane which could result in potential hazard to persons or property on the ground, or ingestion into the engine with engine damage and potential shut down, or damage to the airplane. Two spin brake assemblies are installed in the nose wheel well and include the springs. Wear bars or brake pads installed on the springs bring the nose wheels to a stop after the gear is retracted. Boeing has been informed by operators of 26 incidents of cracked aluminum springs and 10 incidents of broken aluminum spring separations from the airplane between October 2001 and February 2007.These incidents have occurred in a range between 6,363 flight cycles and 19,069 flight cycles. The cracks have been found in a 2 inch curved section of the aluminum spring at a distance of 13 inches from the bottom of the spring. This service bulletin will inspect the spin brake assemblies, that have aluminum springs, for any cracks. Where a crack is found, operators must replace the applicable aluminum spring with a new aluminum spring, or install a complete new composite or CRES spin brake assembly. The spin brake assembly with the composite spring is an earlier production configuration and has been found to produce flight deck noise. Boeing therefore recommends installation of the new CRES spin brake assembly. The Top Kit provided in Revision 1 of this service bulletin includes spin brake assemblies that have CRES springs. Installation of spin brake assemblies that have CRES or composite springs is the terminating action to the repeat inspections given in this service bulletin. Boeing Service Related Problem (SRP) 757-SRP-32-0148 is related to this service bulletin. **ACTION (PRR 54530-282RS)** Get access to the left and right nose wheel spin brake assemblies. Do a General Visual inspection to check if the springs are aluminum or composite.

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. September 10, 2007 757-32-0176 Revision 1: October 16, 2008 7 of 551. If the left and right nose wheel spin brake assemblies have composite springs, no more work is necessary. Put the airplane back to a serviceable condition. **NO TE:**  Because of excessive flight deck noise on airplanes fitted with spin brake assemblies that have composite springs, Boeing recommends installation of new spin brake assemblies with CRES spring. 2. If either of the springs are aluminum, do a Detailed and a High Frequency Eddy Current (HFEC) inspection of each aluminum spring for a crack. a. If a crack is not found in either aluminum spring, put the airplane back to a serviceable condition. Do the repeat inspections at the times given in Paragraph 1.E., Compliance. b. If a crack is found on either aluminum spring, do one of the following three options: (1) Option 1: Install new applicable aluminum spring(s). Put the airplane back to a serviceable condition. Do the repeat inspections of the new part(s) at the times given in Paragraph 1.E., Compliance. (2) Option 2: Replace the applicable aluminum spin brake assembly with a new composite spin brake assembly. Put the airplane back to a serviceable condition. **NO TE:**  Because of excessive flight deck noise on airplanes fitted with spin brake assemblies that have composite springs, Boeing recommends installation of new spin brake assemblies with CRES springs. (3) Option 3: Replace the applicable aluminum spin brake assembly with a new spin brake assembly that have CRES springs. Put the airplane back to a serviceable condition. **EFFECTIVITY** All 757-200/-200CB/-200PF/-300 Airplanes. Refer to Paragraph 1.A., Effectivity, for the list of affected airplanes. **COMPLIANCE** Refer to Paragraph 1.E., Compliance. The Federal Aviation Administration (FAA) will possibly release an Airworthiness Directive related to this service bulletin. The Airworthiness Directive will make the compliance tasks and times given in this service bulletin mandatory. **INDUSTRY SUPPORT INFORMATION** Boeing warranty remedies are available for airplanes in warranty as of April 14, 2006. Please refer to Paragraph 2.B., Industry Support Information. **MANPOWER** Refer to Paragraph 1.G., Manpower **MATERIAL INFORMATION** Boeing Supplied Kits/Parts.

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. September 10, 2007 757-32-0176 Revision 1: October 16, 2008 8 of 55 **BOEING SERVICE BULLETIN 757-32-0176**Refer to Paragraph 2.A., Material - Price and Availability.

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. September 10, 2007 757-32-0176 Revision 1: October 16, 2008 9 of 55 **BOEING SERVICE BULLETIN 757-32-0176**BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. September 10, 2007 757-32-0176 Revision 1: October 16, 2008 10 of 55 **BOEING SERVICE BULLETIN 757-32-0176**

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### Commercial **Airplane Group**  

# 757 Service Bulletin **SPECIAL ATTENTION Number: 757-32-0176**  Date: September 10, 2007 Revision 1: October 16, 2008 ATA System: 3245 **SUBJECT:** LANDING GEAR - Nose Wheel Spin Brake - Spring Inspection and 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. An equivalent change is on subsequent production airplanes. Refer to PRR 54530-282RS for data about this change.
**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. September 10, 2007 757-32-0176 Revision 1: October 16, 2008 11 of 55**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. September 10, 2007 757-32-0176 Revision 1: October 16, 2008 12 of 55 **BOEING SERVICE BULLETIN 757-32-0176 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. September 10, 2007 757-32-0176 Revision 1: October 16, 2008 13 of 55 **BOEING SERVICE BULLETIN 757-32-0176 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. September 10, 2007 757-32-0176 Revision 1: October 16, 2008 14 of 55 **BOEING SERVICE BULLETIN 757-32-0176**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** None. **C. Reason** This service bulletin gives instructions to inspect the springs of the nose wheel spin brake assemblies to determine if they are aluminum or composite. Spin brake assemblies fitted with aluminum springs can crack. Operators must inspect the aluminum springs for any crack and replace them if necessary. A crack in the aluminum spring can result in a separation of the aluminum spring from the airplane. If this service bulletin is not done, an aluminum spring could break and separate from the airplane which could result in potential hazard to persons or property on the ground, or ingestion into the engine with engine damage and potential shut down, or damage to the airplane. Two spin brake assemblies are installed in the nose wheel well and include the springs. Wear bars or brake pads installed on the springs bring the nose wheels to a stop after the gear is retracted. Boeing has been informed by operators of 26 incidents of cracked aluminum springs and 10 incidents of broken aluminum spring separations from the airplane between October 2001 and February 2007. These incidents have occurred in a range between 6,363 flight cycles and 19,069 flight cycles. The cracks have been found in a 2 inch curved section of the aluminum spring at a distance of 13 inches from the bottom of the spring. This service bulletin will inspect the spin brake assemblies, that have aluminum springs, for any cracks. Where a crack is found, operators must replace the applicable aluminum spring with a new aluminum spring, or install a complete new composite or CRES spin brake assembly. The spin brake assembly with the composite spring is an earlier production configuration and has been found to produce flight deck noise. Boeing therefore recommends installation of the new CRES spin brake assembly. The Top Kit provided in Revision 1 of this service bulletin includes spin brake assemblies that have CRES springs. Installation of spin brake assemblies that have CRES or composite springs is the terminating action to the repeat inspections given in this service bulletin. Boeing Service Related Problem (SRP) 757-SRP-32-0148 is related to this service bulletin. Revision 1 is sent to add new Top Kit 012N0045-1 which supplies new spin brake assemblies that have CRES springs. Part 5 of the Work Instructions is updated to add a new Option 3 for operators who want to install the new spin brake assemblies that have CRES springs. Also "spin brake spring arms" is changed to "springs" and "Toe Plate" is changed to "Toe Piece" in all the sections of the service bulletin. Changes to the service bulletin include: — Summary - Background and Action - Instructions are added to install the new spin brake assemblies that have CRES springs as the recommended terminating action to the repeat inspections. — Paragraph 1.C., Reason - Instructions are added to install the new spin brake assemblies that have CRES springs as the recommended terminating action to the repeat inspections. — Paragraph 1.D., Description - Instructions are added to install the new spin brake assemblies that have CRES springs as the recommended terminating action to the repeat inspections.

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. September 10, 2007 757-32-0176 Revision 1: October 16, 2008 15 of 55 **BOEING SERVICE BULLETIN 757-32-0176**— Paragraph 1.E., Compliance - Compliance Table and Note (c) updated. — Paragraph 1.G., Manpower - Existing tables removed. New table added. — Paragraph 1.J.3., - "Installation Drawings Used in the Preparation of this Service Bulletin" - Installation drawing number 012N0045 added. — Paragraph 1.K., - "Publications Affected" - Reference to 757 Illustrated Parts Catalog (IPC) 32-45 added. — Paragraph 2.A., Material - Price and Availability - New table for the top kit 012N0045-1 added. — Paragraph 2.C.1., Parts Necessary for Each Airplane - New table for the top kit 012N0045-1 added. — Paragraph 2.C.2., Parts and Materials Supplied by the Operator — Table 1 - Optional part BACS40R014Y050F added. — Table 2 - Table 2 changed to Table 2-1. Optional part BACS40R014Y046F added. New Washer AN960KD516 added. Part number 141N0096-1 and BACB30NM5K14 deleted. Part number 141N0091-13 moved to the new Table 2-2. — New table 3 for Option 3 added. — Paragraph 3.B., Work Instructions - Option 3 added in PART 5 to install the new spin brake assemblies that have CRES springs. Also reference to AMM 32-45-05 added. — Figure 4 - Optional part BACS40R014Y050F added in step 7, 8 and 10. — Figure 5 - Optional part BACS40R014Y046F added in step 13, 14 and 16. Salvaged filler 141N0096-1 deleted. New fillers to be used which are included in the Spin Brake Assembly 141N0091-13. Note (a) updated and Note (c) deleted. — Figure 6 - New figure with steps to install the new spin brake assemblies that have CRES springs. — Figure 7 - New figure with steps to assemble the new spin brake assembly with a composite spring. **D. Description** Get access to the left and right nose wheel spin brake assemblies. Do a General Visual inspection to check if the springs are aluminum or composite. 1. If the left and right nose wheel spin brake assemblies have composite springs, no more work is necessary. Put the airplane back to a serviceable condition. **NO TE:**  Because of excessive flight deck noise on airplanes fitted with spin brake assemblies that have composite springs, Boeing recommends installation of new spin brake assemblies with CRES springs. 2. If either of the springs are aluminum, do a Detailed and a High Frequency Eddy Current (HFEC) inspection of each aluminum spring for a crack. a. If a crack is not found in either of the aluminum springs, put the airplane back to a serviceable condition. Do the repeat inspections at the times given in Paragraph 1.E., Compliance. b. If a crack is found on either aluminum spring, do one of the following three options: (1) Option 1: Install new applicable aluminum spring(s). Put the airplane back to a serviceable condition. Do the repeat inspections of the new part(s) at the times given in Paragraph 1.E., Compliance. (2) Option 2: Replace the applicable aluminum spin brake assembly with a new composite spin brake assembly. Put the airplane back to a serviceable condition.

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. September 10, 2007 757-32-0176 Revision 1: October 16, 2008 16 of 55 **BOEING SERVICE BULLETIN 757-32-0176 NO** **TE:** Because of excessive flight deck noise on airplanes fitted with spin brake assemblies that have composite springs, Boeing recommends installation of new spin brake assemblies with CRES springs. (3) Option 3: Replace the applicable aluminum spin brake assembly with a new spin brake assembly that has a CRES spring. Put the airplane back to a serviceable condition. Revision 1 - No more work is necessary on the airplanes changed as shown in the original issue of this service bulletin. However, operators must continue to do the inspection detailed at the times given in Paragraph 1.E., Compliance until the newly designed spin brake assemblies made from Corrosion Resistant Steel (CRES) or composite are installed. After installation of the new spin brake assemblies that have CRES or composite springs, it is not necessary to do the repeat inspections. The work in this service bulletin is done in the maintenance zone(s) given below.
**Affected Maintenance Zones Zone**  **Model** 115, 116 757-200, 757-200CB, 757-200PF, 757-300 **E. Compliance** The Federal Aviation Administration (FAA) will possibly release an Airworthiness Directive related to this service bulletin.The Airworthiness Directive will make the compliance tasks and times given in this service bulletin mandatory. **T**

**ab le 1:** **Spring Inspection Repeat Interval**  **(Not to Exceed) Compliance Time (Whichever**  **Occurs Later) Action**  **Condition**

- Within 300 flight cycles after the date on this service bulletin. Before 6,000 total flight cycles on the spring(s) (a) Do a general visual inspection to determine if the left and right springs are made of aluminum or composites in accordance with Accomplishment Instructions, Part 2. All airplanes.

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. September 10, 2007 757-32-0176 Revision 1: October 16, 2008 17 of 55 **BOEING SERVICE BULLETIN 757-32-0176 T**  **ab le 1:** **Spring Inspection Repeat Interval**  **(Not to Exceed) Compliance Time (Whichever**  **Occurs Later) Action**  **Condition** 300 flight cycles. (c) Within 300 flight cycles after the date on this service bulletin. Before 6,000 total flight cycles on the spring(s) (a) Do a detailed inspection of the left and right spring in accordance with Accomplishment Instructions, Part 3. All 757 airplanes fitted with aluminum springs.

1,500 flight cycles. (c) Within 1,500 flight cycles after the date on this service bulletin. Before 6,000 total flight cycles on the spring(s) (a) Do a special detailed inspection (HFEC) of the left and right spring in accordance with Accomplishment Instructions, Part 4. (c)

- - Replace the spring(s) or spin brake assemblies in accordance with Accomplishment Instructions, Part 5.

- Remove and replace the spring(s) before further flight (b) Replace the spring(s) or spin brake assemblies in accordance with Accomplishment Instructions, Part 5. Airplanes with aluminum spring that have any crack.

300 flight cycles. (c) Before 6,000 total flight cycles on the replaced spring(s) (a) Do a detailed inspection in accordance with Accomplishment Instructions, Part 3. Airplanes on which an aluminum spring is replaced with an aluminum spring. 1,500 flight cycles. (c) Before 6,000 total flight cycles on the replaced spring(s) (a) Do a special detailed inspection (HFEC) in accordance with Accomplishment Instructions, Part 4. (c)

- - Replace the spring(s) or spin brake assemblies in accordance with Accomplishment Instructions, Part 5. (a) For spring(s) that have been replaced with new parts and the number of flight cycles since replacement are known. Otherwise the compliance time is before the airframe reaches 6,000 total flight cycles. (b) The airplane can be operated with the restrictions in accordance with the 757 Master Minimum Equipment List (MMEL), for 10 calendar days, with the spin brake assembly removed. (c) The installation of spin brake assemblies that have CRES or composite springs in accordance with Accomplishment Instructions, Part 5 Option 2 or Option 3, is terminating action for the repetitive inspections. Because of excessive flight deck noise on airplanes fitted with spin brake assemblies that have composite springs, Boeing recommends installation of new spin brake assemblies with CRES springs.

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. September 10, 2007 757-32-0176 Revision 1: October 16, 2008 18 of 55 **BOEING SERVICE BULLETIN 757-32-0176 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 Elapsed Hours**  **Task Hours Number of**  **Persons Task** 
0.50 1.00 2 PART 1 - ACCESS 0.20 0.20 1 PART 2 - INITIAL INSPECTION 0.25 0.25 1 PART 3 - DETAILED INSPECTION 1.50 1.50 1 PART 4 - SPECIAL DETAILED INSPECTION 1.25 2.50 2 PART 5 - OPTION 1 - SPIN BRAKE ASSEMBLY REPLACEMENT (WITH ALUMINUM) (b) 5.00 5.00 1 PART 5 - OPTION 2 - SPIN BRAKE ASSEMBLY REPLACEMENT (WITH COMPOSITE) (b) 1.50 1.50 1 PART 5 - OPTION 3 - SPIN BRAKE ASSEMBLY REPLACEMENT (WITH CRES) (b) 0.50 1.00 2 PART 6 - RESTORATION (a) (a) TOTAL FOR EACH AIRPLANE (a) Total for each airplane is not given as the Parts and Options to be accomplished are variable for each airplane. (b) This value is for the replacement of one Spring or Spin Brake Assembly (as applicable). Double the value if both Springs or Spin Brake Assemblies are being replaced. **H. Weight and Balance Changes NO** **TE:** The values that follow are for operators who choose to replace both left and right Spin Brake Assemblies. If only one Spin Brake Assembly is replaced, divide the values by two.

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. September 10, 2007 757-32-0176 Revision 1: October 16, 2008 19 of 55 **BOEING SERVICE BULLETIN 757-32-0176 757- 200**  **Change in Moment (Pound-Inches)**  **Change in Weight (Pounds)**  **Airplane** None None Replace 141N0091-22 (Aluminum) with same - 830 - 3.0 Replace 141N0091-22 (Aluminum) with 141N0091-13 (Composite) + 1,670 + 6.0 Replace 141N0091-22 (Aluminum) with 012N0042-1 (CRES)
**757- 300 Change in Moment**  **(Pound-Inches) Change in Weight**  **(Pounds) Airplane**  None None Replace 141N0091-22 (Aluminum) with same - 350 - 3.0 Replace 141N0091-22 (Aluminum) with 141N0091-13 (Composite) + 710 + 6.0 Replace 141N0091-22 (Aluminum) with 012N0042-1 (CRES)
**I. Electrical Load Data** Not changed. **J. References** 1. Existing Data: a. Engineering Change Memo PRR 54530-282RS. b. Standard Overhaul Practices Manual (SOPM) 20-50-12, 20-50-19. c. 757 Aircraft Maintenance Manual (AMM) 32-00-15, 32-00-20, 32-45-05. d. 757 Non-Destructive Testing (NDT) Manual Part 6, 51-00-01, Part 6, 51-00-19. e. 757 Structural Repair Manual (SRM) 51-40-02. 2. Data supplied with this Service Bulletin: None.

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. September 10, 2007 757-32-0176 Revision 1: October 16, 2008 20 of 55 **BOEING SERVICE BULLETIN 757-32-0176**3. Installation Drawings Used in the Preparation of this Service Bulletin:
**Title Drawing Number**  SPIN BRAKE INSTALLATION - NOSE WHEEL WELL 141N0091 KIT INSTL - SPRING ARM SPIN BRAKE 012N0045 These drawings were used to prepare this service bulletin. These drawings are not necessary to make the specified changes, and are not supplied with this service bulletin. These drawings may not be applicable to all airplane configurations or operators. **K. Publications Affected Chapter-Section** 

**Publication** 32-45 757 Maintenance Manual 32-45 757 Illustrated Parts Catalog **L. Interchangeability and Intermixability of Parts** Refer to Paragraph 2.C., Parts Necessary for Each Airplane, for interchangeability and intermixability information.

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. September 10, 2007 757-32-0176 Revision 1: October 16, 2008 21 of 55 **BOEING SERVICE BULLETIN 757-32-0176**BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. September 10, 2007 757-32-0176 Revision 1: October 16, 2008 22 of 55 **BOEING SERVICE BULLETIN 757-32-0176**

BLANK PAGE**2. MATERIAL INFORMATION A. Material - Price and Availability**  Boeing can supply the kits shown in Paragraph 2.C., Parts Necessary for Each Airplane , as shown below. If there is a limit to the quantity (QTY) of available kits, a supply sequence is given by Spares. More kits become available as shown in the Reorder Lead Time (ROLT). ROLT is calculated from the date Boeing gets the purchase order.

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. September 10, 2007 757-32-0176 Revision 1: October 16, 2008 23 of 55 **BOEING SERVICE BULLETIN 757-32-0176 Unit Price thru**  **May 31/08 ROLT**  **(Weeks) QTY**  **Date Name**  **Kit Number** $9,069.00 44 12 Nov. 21/08 KIT INSTL - SPRING ARM SPIN BRAKE 012N0045-1 12 Dec. 09/08 12 Dec. 23/08 12 Jan. 15/09 9 Jan. 29/09 7 Feb. 12/09 7 Feb. 26/09 7 Mar. 12/09 7 Mar. 26/09 7 Apr. 09/09 7 Apr. 23/09 7 May. 07/09 7 May. 21/09 7 Jun. 05/09 7 Jun. 19/09 7 Jul. 06/09 7 Jul. 20/09 7 Aug. 03/09 7 Aug. 17/09 7 Aug. 31/09 7 Sep. 15/09 7 Sep. 29/09 7 Oct. 13/09 7 Oct. 27/09 7 Nov. 10/09 7 Nov. 24/09 7 Dec. 10/09 7 Jan. 04/10 4 Jan. 18/10 The kits are subject to the terms and conditions of the Boeing standard purchase order acknowledgment. After the Unit Price date, new price and ROLT data is applicable. Prices are in United States dollars. Terms: Net 30 days.

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. September 10, 2007 757-32-0176 Revision 1: October 16, 2008 24 of 55 **BOEING SERVICE BULLETIN 757-32-0176 REFERENCE** **THIS SER VICE B** **ULLETIN AND SUBMIT Y**  **OUR PURCHASE ORDER BY ONE OF THE METHODS** **THA T FOLLO** **W :**  1. Order on-line via ATA Spec 2000 or Boeing Part Page 2. Fax to (206) 662-7145 3. Spares Customer Support - MC 36-65 Boeing Spares Department P.O. Box 3707 Seattle, Washington 98124-2207 USA **B. Industry Support Information** Boeing warranty remedies are available for 757 airplanes in warranty as of April 14, 2006. For task hour reimbursement for airplanes in warranty as of that date, send a warranty claim to Boeing Commercial Airplanes Group - Warranties. The kits for airplanes in warranty as of that date will be supplied at no charge. Send a purchase order for the kits to Boeing Spares. Please refer to this service bulletin number and reference the airplane variable numbers in your purchase order. **C. Parts Necessary For Each Airplane** 1. Kits/Parts: **NO TE:**  For operators who choose to replace the existing aluminum spring(s) with new CRES spring(s) in accordance with Accomplishment Instructions Part 5, Option 3, use the parts given in this Table and materials given in Paragraph 2.C.2., Parts and Materials Supplied by the Operator (Table 3).
**Kit 012N0045 Notes**  **Existing Part Number**  **Name QTY**  **New Part Number -1**  Kit provides parts for replacement of left and right Spin Brake Assemblies. KIT INSTL - SPRING ARM SPIN BRAKE - 012N0045-1

SPIN BRAKE ASSY - NOSE WHEEL 2 012N0042-1
FILLER 4 012N0056-1 SHIM, LAMINATED 4 BACS40R014Y050F WASHER, PLAIN 8 NAS1149C0563R 2. Parts and Materials Supplied by the Operator: **NO TE:**  For operators who choose to replace the existing aluminum spring(s) with new aluminum spring(s) in accordance with Accomplishment Instructions Part 5, Option 1, use the parts and materials shown in Table 1.

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. September 10, 2007 757-32-0176 Revision 1: October 16, 2008 25 of 55 **BOEING SERVICE BULLETIN 757-32-0176 T**  **ABLE 1: P**  **AR TS AND MA**  **TERIALS REQ UIRED FOR P**  **AR T 5 OPTION 1** 
**Notes Name**  **QTY Part Number /**  **Specification** (d) Spring (aluminum) 1 141N0091-19 (a) (d) Sealant 4 oz BMS 5-95 (a) (d) Adhesive 1 oz BAC 5010, Type 60 (d) Insulator 2 141N0091-10 (b) (d) Toe Piece 1 141N0097-6 (c) (d) Wear Bar 4 141N0092-1 (d) (e) Laminated Shim 2 BACS40R014F050F (BACS40R014Y050F Optional) (a) See the Qualified Products List at the end of the Boeing Material Specification (BMS) for supplier data. (b) Required if the upper surface of the existing toe pieces are 1/32 inch or less above the countersunk fastener head. Inspect the toe pieces in accordance with 757 AMM 32-45-05. (c) Required if the upper surface of the existing wear bars are 1/32 inch or less above the bolt head. Inspect the wear bars in accordance with 757 AMM 32-45-05. (d) The QTY numbers shown are the number of parts necessary to replace one spin brake assembly. (e) Sources for procurement of laminated sheet stock are contained in the Qualified Products List of BMS 7-335.

**NO TE:**  For operators who choose to replace the existing aluminum spring(s) with new composite spring(s) in accordance with Accomplishment Instructions Part 5, Option 2, use the parts and materials shown in Table 2-1 and Table 2-2. **T**

**ABLE 2-1: P**  **AR TS AND MA**  **TERIALS REQ UIRED FOR P**  **AR T 5 OPTION 2** 
**Notes Existing Part Number**  **Name QTY**  **Part Number / Specification**  (b) (c) 141N0091-22 Spin Brake Instl (composite spring) 1 141N0091-13 (c) (d)

- Laminated Shim 2 BACS40R014F046F (BACS40R014Y046F Optional) (a) (c)

- Sealant 4 oz BMS 5-95 (c)

- Adhesive 2 oz BAC5010, Type 60 (c)

- Washer 2 AN960KD516 (NAS1149D0563K Optional)

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. September 10, 2007 757-32-0176 Revision 1: October 16, 2008 26 of 55 **BOEING SERVICE BULLETIN 757-32-0176 T**  **ABLE 2-1: P**  **AR TS AND MA**  **TERIALS REQ UIRED FOR P**  **AR T 5 OPTION 2** 
**Notes Existing Part Number**  **Name QTY**  **Part Number / Specification**  (a) See the Qualified Products List at the end of the Boeing Material Specification (BMS) for supplier data. (b) Discard the existing part where cracks are found. (c) The QTY numbers shown are the number of parts necessary to replace one spin brake assembly. (d) Sources for procurement of laminated sheet stock are contained in the Qualified Products List of BMS 7-335.
**T**

**ABLE 2-2: P**  **AR TS AND MA**  **TERIALS REQ UIRED FOR P**  **AR T 5 OPTION 2** 
**Kit 141N0091 Notes**  **Existing Part Number**  **Name QTY**  **New Part Number -13**  SPIN BRAKE INSTL - 141N0091-13
INSULATOR 2 141N0091-10 BUSHING 2 141N0091-11 BUSHING 8 141N0091-12 BRAKE PAD 1 141N0091-14 INSULATOR 1 141N0091-15 ROLL THREAD 1 141N0091-16 ROLL THREAD 1 141N0091-21 SPRING 1 141N0091-5 FILLER 3 141N0096-1 WASHER 2 141N0096-2 TOE PIECE 1 141N0097-4 WASHER 2 AN960XC516 (NAS1149C0563B Optional) BOLT, HEX HEAD 4 BACB30NM5K14 WASHER, INSULATING 8 NAS549-10

**NO TE:**  For operators who choose to replace the existing aluminum spring(s) with new CRES spring(s) in accordance with Accomplishment Instructions Part 5, Option 3, use the Top Kit 012N0045-1 and materials shown in Table 3.

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. September 10, 2007 757-32-0176 Revision 1: October 16, 2008 27 of 55 **BOEING SERVICE BULLETIN 757-32-0176 T**  **ABLE 3: P**  **AR TS AND MA**  **TERIALS REQ UIRED FOR P**  **AR T 5 OPTION 3** 
**Notes Existing Part Number**  **Name QTY**  **Part Number / Specification**  (a) (b)

- Sealant 4 oz BMS 5-95 (a) See the Qualified Products List at the end of the Boeing Material Specification (BMS) for supplier data. (b) The QTY numbers shown are the number of parts necessary to replace one spin brake assembly.
3. Parts Modified and Reidentified: None. 4. Parts Removed and Not Replaced: None. **D. Parts Necessary to Change Spares** None. **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. September 10, 2007 757-32-0176 Revision 1: October 16, 2008 28 of 55 **BOEING SERVICE BULLETIN 757-32-0176 3. ACCOMPLISHMENT INSTRUCTIONS**  **A. GENERAL INFORMATION CA** **UTION:** 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. **NO TE:**  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. Unless shown differently, these dimensions and tolerances are used: – Linear dimensions are in inches – Tolerance on linear dimensions, other than rivet and bolt edge margins, is plus or minus 0.03 inch – Tolerance on rivet and bolt edge margin is plus or minus 0.05 inch – Angular tolerance is plus or minus 2 degrees – Hole dimensions for standard solid rivets are given in 757 SRM, Chapter 51 – Torque limits to tighten nuts and bolts are given in 757 SRM, Chapter 51 5. For approved fastener and process material substitutions, refer to 757 SRM, Chapter 51. Alternate fasteners are given in 757 SRM Chapter 51 and Boeing Drawing 65-88700. 6. If the length of any fastener specified in this service bulletin does not meet the installation standards given in SRM Chapter 51, then a fastener of the same specification, or an approved substitute, with a length which meets the installation standards given in SRM Chapter 51 may be used. 7. A Detailed Inspection is defined as: An intensive examination of a specific item, installation, or assembly to detect damage, failure, or irregularity. Available lighting is normally supplemented with a direct source of good lighting at an intensity deemed appropriate. Inspection aids such as mirrors, magnifying lenses, etc. may be necessary. Surface cleaning and elaborate procedures may be required. 8. 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. PART 1 - ACCESS

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. September 10, 2007 757-32-0176 Revision 1: October 16, 2008 29 of 55 **BOEING SERVICE BULLETIN 757-32-0176**a. Make sure the landing gear downlocks are installed. Refer to 757 AMM 32-00-20 as an accepted procedure. b. Open the doors for the nose landing gear and install the door locks. Refer to 757 AMM 32-00-15 as an accepted procedure. c. Get access to the nose wheel spin brake assemblies located on the top surface of the nose gear wheel well. 2. PART 2 - INITIAL INSPECTION a. Inspect to determine if the left and right springs are aluminum or composite in accordance with FIGURE 1. (1) If the left and right springs are composite, do PART 6 - RESTORATION. **NO TE:**  Operators can choose to do Part 5 Option 3 and replace spin brake assemblies, that have composite spring, with the new spin brake assemblies with CRES spring. This could reduce flight deck noise. (2) If either of the springs are aluminum, do PART 3 - DETAILED INSPECTION and PART 4 - SPECIAL DETAILED INSPECTION on the spring(s) that is/are aluminum. **NO TE:**  Both PART 3 - DETAILED INSPECTION and PART 4 - SPECIAL DETAILED INSPECTION can be done at the same time as part of the Initial Inspection where aluminum springs are installed. Refer to Paragraph 1.E., Compliance for the thresholds of the repeat Detailed and Special Detailed Inspections. 3. PART 3 - DETAILED INSPECTION a. At the times given in Paragraph 1.E., Compliance, do a detailed inspection of the left or right aluminum springs (as applicable) for any crack in accordance with FIGURE 2. (1) If a crack is found, do PART 5 - LEFT OR RIGHT SPRING/SPIN BRAKE ASSEMBLY REPLACEMENT (2) If no crack is found, do PART 6 - RESTORATION. 4. PART 4 - SPECIAL DETAILED INSPECTION a. At the times given in Paragraph 1.E., Compliance, do a High Frequency Eddy Current (HFEC) inspection of the left or right aluminum spring (as applicable) for any crack in accordance with FIGURE 3. (1) If a crack is found, do PART 5 - LEFT OR RIGHT SPRING/SPIN BRAKE ASSEMBLY REPLACEMENT (2) If no crack is found, do PART 6 - RESTORATION. 5. PART 5 - LEFT OR RIGHT SPRING/SPIN BRAKE ASSEMBLY REPLACEMENT

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. September 10, 2007 757-32-0176 Revision 1: October 16, 2008 30 of 55 **BOEING SERVICE BULLETIN 757-32-0176**a. Option 1: Replace the left or right (as applicable) aluminum spring with a new aluminum spring in accordance with FIGURE 4 , or replace the existing aluminum spin brake assembly with a new aluminum spin brake assembly in accordance with 757 AMM 32-45-05. **NO TE:**  Option 1 is not a terminating action and operators must continue to do PART 3 and PART 4 on the replaced aluminum spring at the times given in Paragraph 1.E., Compliance. b. Option 2: Replace the left or right (as applicable) aluminum spin brake assembly with a new composite spin brake assembly. First assemble the composite spin brake assembly in accordance with FIGURE 7 and then install the spin brake assembly in accordance with FIGURE 5 or, replace the existing aluminum spin brake assembly with a new composite spin brake assembly in accordance with 757 AMM 32-45-05. **NO TE:**  Option 2 is a terminating action for this service bulletin. However, Boeing recommends installation of the new CRES spin brake assembly given in Option 3 because of excessive flight deck noise on airplanes fitted with composite spin brake assemblies. c. Option 3: Replace the left or right (as applicable) aluminum spin brake assembly with a new CRES spin brake assembly in accordance with FIGURE 6 or, replace the existing aluminum spin brake assembly with a new CRES spin brake assembly in accordance with 757 AMM 32-45-05. **NO TE:**  Option 3 is the terminating action for this Service Bulletin. 6. PART 6 - RESTORATION a. Remove the door locks and close the doors for the nose landing gear. Refer to 757 AMM 32-00-15 as an accepted procedure. b. Remove the landing gear downlocks. Refer to 757 AMM 32-00-20 as an accepted procedure. c. Put the airplane back to a serviceable condition.

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. September 10, 2007 757-32-0176 Revision 1: October 16, 2008 31 of 55 **BOEING SERVICE BULLETIN 757-32-0176 FIGURE 1: SPIN BRAKE ASSEMBLY- GENERAL VISUAL INSPECTION**  **(SHEET 1 OF 2)**

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. September 10, 2007 757-32-0176 Revision 1 October 16, 2008 32 of 55 **BOEING SERVICE BULLETIN 757-32-0176**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.
**MORE DATA QTY**  **IDENTIFICATION NAME**  **TASK STEP**  to check for aluminum spin brake assembly P/N 141N0091-22 or composite spin brake assembly P/N 141N0091-13. 2 141N0091-( ) Spin Brake Assembly General Visual Inspection 1

**FIGURE 1: SPIN BRAKE ASSEMBLY- GENERAL VISUAL INSPECTION (SHEET 2 OF 2)** 

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. September 10, 2007 757-32-0176 Revision 1 October 16, 2008 33 of 55 **BOEING SERVICE BULLETIN 757-32-0176 FIGURE 2: SPRING - DETAILED INSPECTION**  **(SHEET 1 OF 2)**

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. September 10, 2007 757-32-0176 Revision 1 October 16, 2008 34 of 55 **BOEING SERVICE BULLETIN 757-32-0176**The step numbers shown below agree with the numbers shown in the circle symbols in the figure. The QTY numbers shown below is for the inspection of one spring.
**MORE DATA QTY**  **IDENTIFICATION NAME**  **TASK STEP**  for any crack on the surface or edge of the spring. 1 141N0091-19 Spring (Aluminum) Detailed Inspection 1

**FIGURE 2: SPRING - DETAILED INSPECTION (SHEET 2 OF 2)** 

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. September 10, 2007 757-32-0176 Revision 1 October 16, 2008 35 of 55 **BOEING SERVICE BULLETIN 757-32-0176 FIGURE 3: SPRING - SPECIAL DETAILED INSPECTION**  **(SHEET 1 OF 2)**

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. September 10, 2007 757-32-0176 Revision 1 October 16, 2008 36 of 55 **BOEING SERVICE BULLETIN 757-32-0176**The step numbers shown below agree with the numbers shown in the circle symbols in the figure. The QTY numbers shown below is for the inspection of one spring.
**MORE DATA QTY**  **IDENTIFICATION NAME**  **TASK STEP**  for any crack on the surface or edge of the spring in accordance with 757 NDT, Part 6, 51-00-01 or 757 NDT, Part 6, 51-00-19. 1 141N0091-19 Spring (Aluminum) HFEC Inspection 1

**FIGURE 3: SPRING - SPECIAL DETAILED INSPECTION (SHEET 2 OF 2)** 

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. September 10, 2007 757-32-0176 Revision 1 October 16, 2008 37 of 55 **BOEING SERVICE BULLETIN 757-32-0176 FIGURE 4: SPRING - REPLACEMENT**  **(SHEET 1 OF 5)**

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. September 10, 2007 757-32-0176 Revision 1 October 16, 2008 38 of 55 **BOEING SERVICE BULLETIN 757-32-0176 FIGURE 4: SPRING - REPLACEMENT**  **(SHEET 2 OF 5)**

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. September 10, 2007 757-32-0176 Revision 1 October 16, 2008 39 of 55 **BOEING SERVICE BULLETIN 757-32-0176**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 to replace one spring.
**MORE DATA QTY**  **IDENTIFICATION NAME**  **TASK STEP**  (a) 1 141N0091-22 Spin Brake Assembly Remove (Keep) 1

2 141N0096-1 Filler 4 BACB30NM5K16 Bolt 4 AN960JD516 Washer and discard. 2 BACS40R014F050F Shim Remove from the existing Spin Brake Assembly. (b) 4 141N0092-1 Wear Bar Remove (Keep) 2 8 BACB30VU6K8 Bolt 8 BACN10YR3CD Nut 8 AN960JD10 Washer from the existing Spin Brake Assembly. (c) 1 141N0097-6 Toe Piece Remove (Keep) 3 2 BACB30VT8K9 Bolt 2 AN960JD416 Washer 2 141N0096-2 Washer 2 BACN10YR4CD Nut and discard. 2 141N0091-10 Insulator Remove onto the new Spring P/N 141N0091-19 if kept from Step 2. Or install new wear bars and fasteners onto the Spring as necessary. (d) (h) 4 141N0092-1 Wear Bar Install (Kept) or (New) 4 8 BACB30VU6K8 Bolt 8 BACN10YR3CD Nut 8 AN960JD10 Washer to the insulator. (e) 1 oz. BAC5010, Type 60 Adhesive Apply 5 onto the new Spring P/N 141N0091-19 if kept from Step 3. Or install a new toe piece and insulators onto the Spring as necessary. (d) (h) 2 141N0091-10 Insulator Install (New) 6 1 141N0097-6 Toe Piece Install (Kept) or (New) 2 BACB30VT8K9 Bolt 2 AN960JD416 Washer 2 141N0096-2 Washer 2 BACN10YR4CD Nut

**FIGURE 4: SPRING - REPLACEMENT (SHEET 3 OF 5)** 

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. September 10, 2007 757-32-0176 Revision 1 October 16, 2008 40 of 55 **BOEING SERVICE BULLETIN 757-32-0176 MORE DATA**  **QTY IDENTIFICATION**  **NAME TASK**  **STEP** (f) 1 141N0091-22 Spin Brake Assembly Locate (Changed) 7

2 BACS40R014F050F Shim Locate (New) (BACS40R014Y050F Optional) 2 141N0096-1 Filler Locate (Kept) 4 BACB30NM5K16 Bolt 4 AN960JD516 Washer to prepare the parts for final installation. 1 141N0091-22 Spin Brake Assembly Remove (Changed) 8

2 BACS40R014F050F Shim Remove (New) (BACS40R014Y050F Optional) 2 141N0096-1 Filler Remove (Kept) 4 BACB30NM5K16 Bolt 4 AN960JD516 Washer to the shims, fillers, bolts, washers and the spin brake surface that will contact the wheel well ceiling. 3 oz BMS 5-95 Sealant Apply 9

(g) (h) 1 141N0091-22 Spin Brake Assembly Install (Changed) 10

2 BACS40R014F050F Shim Install (New) (BACS40R014Y050F Optional) 2 141N0096-1 Filler Install (Kept) 4 BACB30NM5K16 Bolt 4 AN960JD516 Washer to the bolt heads and washers once the spin brake assembly is installed. 1 oz BMS 5-95 Sealant Apply 11

(a) Remove and keep the bolts, washers and fillers that attach the spin brake assembly to the top surface of the wheel well. Remove and keep the spin brake assembly and discard the shims. (b) if the upper surface of the wear bar is greater than 1/32 inch above the bolt head. If not, discard the wear bar and fasteners. Inspect each wear bar in accordance with 757 AMM 32-45-05.

**FIGURE 4: SPRING - REPLACEMENT (SHEET 4 OF 5)** 

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. September 10, 2007 757-32-0176 Revision 1 October 16, 2008 41 of 55 **BOEING SERVICE BULLETIN 757-32-0176 MORE DATA**  **QTY IDENTIFICATION**  **NAME TASK**  **STEP** (c) If the upper surface of the toe piece is greater than 1/32 inch above the countersunk fastener head. If not, discard the toe piece. Inspect the toe piece in accordance with 757 AMM 32-45-05. (d) The installation of the wear bars and toe piece onto the new spin brake spring 141N0091-19 creates the changed spin brake assembly 141N0091-22. (e) Bond the insulator P/N 141N0091-10 to the spin brake spring as part of the toe piece installation. (f) Temporarily locate the spin brake assembly as follows: -- Loosely install the four bolts and washers to hold the spin brake in the installed position. -- Make sure the aft surface of the spin brake is 15.42 to 15.52 inches from the nose wheel well forward bulkhead as shown in View A-A. -- Increase or decrease the thickness of shim material if necessary to retain the 15.42 to 15.52 inches dimension between the nose wheel well forward bulkhead and aft surface of the spin brake assembly above the toe piece. (g) Put the spin brake in position on the wheel well ceiling and install with the bolts and washers (4 locations), shims (2 locations) and fillers (2 locations). Install the fasteners with BMS 5-95 sealant in accordance with SOPM 20-50-19. (h) Install the fasteners in accordance with 757 SRM 51-40-02.

**FIGURE 4: SPRING - REPLACEMENT (SHEET 5 OF 5)** 

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. September 10, 2007 757-32-0176 Revision 1 October 16, 2008 42 of 55 **BOEING SERVICE BULLETIN 757-32-0176 FIGURE 5: SPIN BRAKE ASSEMBLY (COMPOSITE) - REPLACEMENT**  **(SHEET 1 OF 4)**

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. September 10, 2007 757-32-0176 Revision 1 October 16, 2008 43 of 55 **BOEING SERVICE BULLETIN 757-32-0176**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 one spin brake assembly.

**FIGURE 5: SPIN BRAKE ASSEMBLY (COMPOSITE) - REPLACEMENT (SHEET 2 OF 4)** 

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. September 10, 2007 757-32-0176 Revision 1 October 16, 2008 44 of 55 **BOEING SERVICE BULLETIN 757-32-0176 MORE DATA**  **QTY IDENTIFICATION**  **NAME TASK**  **STEP** (a) 1 141N0091-22 Spin Brake Assembly Remove 1

2 BACS40R014F050F Shim 4 BACB30NM5K16 Bolt 2 141N0096-1 Filler 4 AN960JD516 Washer (b) 1 141N0091-13 Spin Brake Assembly Locate (New) 2
3 141N0096-1 Filler 2 BACS40R014F046F (BACS40R014Y046F Optional) Shim

4 BACB30NM5K14 Bolt with the two bolts in the the aft position. 2 AN906KD516 Washer
with the two bolts in the forward position. 2 AN960XC516 Washer to prepare the parts for the final installation. 1 141N0091-13 Spin Brake Assembly Remove (New) 3
3 141N0096-1 Filler 2 BACS40R014F046F (BACS40R014Y046F Optional) Shim

4 BACB30NM5K14 Bolt 2 AN960KD516 Washer 2 AN960XC516 Washer to the shims, fillers, bolts,washers and the spin brake assembly surface that will contact the wheel well ceiling. 3 oz BMS 5-95 Sealant Apply 4

**FIGURE 5: SPIN BRAKE ASSEMBLY (COMPOSITE) - REPLACEMENT (SHEET 3 OF 4)** 

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. September 10, 2007 757-32-0176 Revision 1 October 16, 2008 45 of 55 **BOEING SERVICE BULLETIN 757-32-0176 MORE DATA**  **QTY IDENTIFICATION**  **NAME TASK**  **STEP** onto the nose wheel well ceiling. (d) (e) (f) (g) 1 141N0091-13 Spin Brake Assembly Install (New) 5
3 141N0096-1 Filler 2 BACS40R014F046F (BACS40R014Y046F Optional) Shim

4 BACB30NM5K14 Bolt with the two bolts in the the aft position. 2 AN960KD516 Washer
with the two bolts in the forward position. 2 AN960XC516 Washer
to the bolt heads and washers once the spin brake assembly is installed. 1 oz BMS 5-95 Sealant Apply 6

(a) Remove the spin brake assembly. Discard the spin brake assembly, bolts, shims, washers and fillers. (b) Temporarily locate the spin brake assembly as follows: -- Loosely install the four bolts and washers to hold the spin brake in the installed position. -- Make sure the forward surface of the spin brake is 14.95 to 15.05 inches from the nose wheel well forward bulkhead as shown in View A-A. -- Increase or decrease the thickness of shim material as necessary, to retain a 14.95 to 15.05 inches dimension between the nose wheel well forward bulkhead and the forward surface of the spin brake assembly above the toe piece. (c) This note is deleted. (d) An additional filler P/N 141N0096-1 is required to install the replacement composite spin brake assembly. (e) Put the spin brake in position on the wheel well ceiling and install with the bolts and washers (4 locations),shims (2 locations) and fillers (3 locations). Install the fasteners with BMS 5-95 sealant in accordance with SOPM 20-50-19. (f) A shorter grip length is required to install the 141N0091-13 spin brake assembly. Bolt P/NBACB30NM5K14 replaces P/N BACB30NM5K16. Alternatively, operators can install additional washers under the heads of P/N BACB30NM5K16 to get the correct grip length. (g) Tighten the bolts within a torque range of 40 to 60 inch pounds.

**FIGURE 5: SPIN BRAKE ASSEMBLY (COMPOSITE) - REPLACEMENT (SHEET 4 OF 4)** 

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. September 10, 2007 757-32-0176 Revision 1 October 16, 2008 46 of 55 **BOEING SERVICE BULLETIN 757-32-0176 FIGURE 6: SPIN BRAKE ASSEMBLY (CRES) - REPLACEMENT**  **(SHEET 1 OF 4)**

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. September 10, 2007 757-32-0176 Revision 1 October 16, 2008 47 of 55 **BOEING SERVICE BULLETIN 757-32-0176**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 one spin brake assembly.

**FIGURE 6: SPIN BRAKE ASSEMBLY (CRES) - REPLACEMENT (SHEET 2 OF 4)** 

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. September 10, 2007 757-32-0176 Revision 1 October 16, 2008 48 of 55 **BOEING SERVICE BULLETIN 757-32-0176 MORE DATA**  **QTY IDENTIFICATION**  **NAME TASK**  **STEP** (a) 1 141N0091-( ) Spin Brake Assembly Remove 1

2 BACS40R014F050F Shim 2 141N0096-1 Filler 4 AN960JD516 Washer 4 BACB30NM5K16 Bolt Remove (Keep) (b) 1 012N0042-1 Spin Brake Assembly Locate (New) 2

2 012N0056-1 Filler 2 BACS40R014Y050F Shim 4 NAS1149C0563R Washer, Plain 4 BACB30NM5K16 Bolt Locate (kept) to prepare the parts for the final installation. 1 012N0042-1 Spin Brake Assembly Remove (New) 3

2 012N0056-1 Filler 2 BACS40R014Y050F Shim 4 NAS1149C0563R Washer, Plain 4 BACB30NM5K16 Bolt Remove (Kept) to the shims, fillers, bolts, washers and the spin brake surface that will contact the wheel well ceiling. 3 oz. BMS 5-95 Sealant Apply 4

onto the nose wheel well ceiling. (c) (d) 1 012N0042-1 Spin Brake Assembly Install (New) 5

2 012N0056-1 Filler 2 BACS40R014Y050F Shim 4 NAS1149C0563R Washer, Plain 4 BACB30NM5K16 Bolt Install (Kept) to the bolt heads and washers once the spin brake assembly is installed. 1 oz. BMS 5-95 Sealant Apply 6

(a) Remove and keep the bolts that attach the spin brake assembly to the top surface of the wheel well and remove the spin brake assembly. Discard the spin brake assembly, filler, washers and shims.

**FIGURE 6: SPIN BRAKE ASSEMBLY (CRES) - REPLACEMENT (SHEET 3 OF 4)** 

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. September 10, 2007 757-32-0176 Revision 1 October 16, 2008 49 of 55 **BOEING SERVICE BULLETIN 757-32-0176 MORE DATA**  **QTY IDENTIFICATION**  **NAME TASK**  **STEP** (b) Temporarily locate the spin brake assembly as follows: -- Loosely install the four bolts and washers to hold the spin brake in the installed position. -- Make sure the aft surface of the spin brake is 15.42 to 15.52 inches from the nose wheel well forward bulkhead as shown in View A-A.-- Increase or decrease the thickness of shim material as necessary, to retain a 15.42 to 15.52 inches dimension between the nose wheel well forward bulkhead and the aft surface of the spin brake assembly above the toe piece. (c) Put the spin brake in position on the wheel well ceiling and install with the bolts and washers (4 locations), shims (2 locations) and fillers (2 locations). Install the fasteners with BMS 5-95 sealant in accordance with SOPM 20-50-19. (d) Tighten the bolts within a torque range of 40 to 60 inch pounds.

**FIGURE 6: SPIN BRAKE ASSEMBLY (CRES) - REPLACEMENT (SHEET 4 OF 4)** 

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. September 10, 2007 757-32-0176 Revision 1 October 16, 2008 50 of 55 **BOEING SERVICE BULLETIN 757-32-0176 FIGURE 7: SPIN BRAKE ASSEMBLY (COMPOSITE) - ASSEMBLE**  **(SHEET 1 OF 5)**

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. September 10, 2007 757-32-0176 Revision 1 October 16, 2008 51 of 55 **BOEING SERVICE BULLETIN 757-32-0176**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 one spin brake assembly.

**FIGURE 7: SPIN BRAKE ASSEMBLY (COMPOSITE) - ASSEMBLE (SHEET 2 OF 5)** 

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. September 10, 2007 757-32-0176 Revision 1 October 16, 2008 52 of 55 **BOEING SERVICE BULLETIN 757-32-0176 MORE DATA**  **QTY IDENTIFICATION**  **NAME TASK**  **STEP** 0.380 - 0.384 inch diameter in the new 141N0091-5 Spring only. 8
- Holes Drill 1

0.443 - 0.447 inch diameter in the new 141N0091-5 Spring only 2
- Holes Drill 2

on the new Spring 141N0091-5. (b) 1 141N0091-14 Brake Pad Put/Hold 3
0.203 - 0.207 inch diameter. Use the holes drilled in the new Spring 141N0091-5 as guides for hole locations. 8 141N0091-14 Brake Pad Drill

0.375 inch diameter to the depth shown. 8 141N0091-14 Brake Pad Counterbore
to 0.315 inch diameter, 100 degrees as shown. 8 141N0091-14 Brake Pad Countersink from the new Spring. 1 141N0091-14 Brake Pad Remove/Keep 4 on the new Spring. Mark the Insulator around its edge to match Spring and brake Pad contour. 1 1 141N0091-15 141N0091-14 Insulator and Brake Pad Put/Hold 5

from the new Spring. 1 141N0091-14 Brake Pad Remove from the new Spring. 1 141N0091-15 Insulator Remove to match spring and brake pad contour as shown. (c) 1 141N0091-15 Insulator Cut
in Toe Piece Insulator if necessary. 2
- Hole Make 6 to 141N0091-12 Bushing.

- BAC5010, Type 60 Adhesive Apply 7 bond the bushing in the new Spring 141N0091-5 Spring. Refer to SOPM 20-50-12, Type 60. 8 141N0091-12 Bushing Install (New)

**FIGURE 7: SPIN BRAKE ASSEMBLY (COMPOSITE) - ASSEMBLE (SHEET 3 OF 5)** 

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. September 10, 2007 757-32-0176 Revision 1 October 16, 2008 53 of 55 **BOEING SERVICE BULLETIN 757-32-0176 MORE DATA**  **QTY IDENTIFICATION**  **NAME TASK**  **STEP** to 141N0091-11 Bushing and 141N0091-10 Toe Piece Insulators. - BAC5010, Type 60 Adhesive Apply 8

bond the bushing to the 141N0091-5 Spring. Refer to SOPM 20-50-12 as an accepted procedure 2 141N0091-11 Bushing Install (New)

bond the insulator to the 141N0091-5 Spring. Refer to SOPM 20-50-12 as an accepted procedure. 2 141N0091-10 Toe Piece Insulator Install (New)

to washer 141N0096-2.

- BAC5010, Type 60 Adhesive Apply 9 bond the washer to the new Insulator. Refer to SOPM 20-50-12 as an accepted procedure. 2 141N0096-2 Washer Install (New)

to insulator 141N0091-15.

- BAC5010, Type 60 Adhesive Apply 10 bond the insulator to the 141N0091-5 Spring. Refer to SOPM 20-50-12 as an accepted procedure. 1 141N0091-15 Insulator Install (New)

1 141N0097-4 Toe Piece Install (New) 2 BACB30MY8K8 Bolt Install (New) (a) 2 BACN10JC4CD Nut Install (New) 1 141N0091-14 Brake Pad Install (New) 11 to washer NAS549-10

- BAC5010, Type 60 Adhesive Apply bond the washer to the 141N0091-5 Spring. Refer to SOPM 20-50-12 as an accepted procedure. 8 NAS549-10 Washer Install (New)

torque tighten to 8 -10 inch-pounds. 8 BACB30NW6K7 Bolt Install (New)
8 BACN10JC3CM Nut Install (New) (a) Torque tighten the nuts to between 40 to 60 inch pounds.

**FIGURE 7: SPIN BRAKE ASSEMBLY (COMPOSITE) - ASSEMBLE (SHEET 4 OF 5)** 

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. September 10, 2007 757-32-0176 Revision 1 October 16, 2008 54 of 55 **BOEING SERVICE BULLETIN 757-32-0176 MORE DATA**  **QTY IDENTIFICATION**  **NAME TASK**  **STEP** (b) Clamp the brake pad to the new spring to achieve 0.00/0.06 maximum gap between the spring and the brake pad. The contour or the brake pad can vary at the large radius. If necessary the brake pad can be heated to 250 degree Fahrenheit (max) to form the brake pad to the contour of the spring. (c) Zig-Zag stitch edges to prevent fraying of edges. Use 141N0091-16 Teflon coated glass fiber thread in accordance with BAC5437, or 141N0091-21 Nomex size E thread in accordance with MIL-T-43636.

**FIGURE 7: SPIN BRAKE ASSEMBLY (COMPOSITE) - ASSEMBLE (SHEET 5 OF 5)** 

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. September 10, 2007 757-32-0176 Revision 1 October 16, 2008 55 of 55 **BOEING SERVICE BULLETIN 757-32-0176**