### Commercial **Airplanes** 

# 737 Service Bulletin **SPECIAL ATTENTION Number: 737-55-1093**  Original Issue: April 09, 2012 ATA System: 5510 **SUBJECT:** STABILIZERS - Horizontal Stabilizer - Replacement of Rear Spar Attach Pins With Unapproved Surface Coating Export of this technology is controlled under the United States Export Administration Regulations (EAR) (15 CFR 300-774). 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 © 2012 Boeing. Unpublished Work. All Rights Reserved. Treatment of this document and its content is governed by contract with Boeing. Rights to use this document are licensed on a per aircraft basis and such rights may not be transferable. For more information, contact The Boeing Company. Boeing, the Boeing signature, the Boeing symbol, 707, 717, 727, 737, 747, 757, 767, 777, 787, DreamlinerTM, 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 Boeing liveries 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 is a trademark of Boeing Management Company.

Original Issue: April 09, 2012 737-55-1093 1 of 47 7.0Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 09, 2012 737-55-1093 2 of 47 **BOEING SERVICE BULLETIN 737-55-1093**

BLANK PAGE**Table of Contents** Summary...................................................... 5 1. PLANNING INFORMATION........................................ 9 A. Effectivity................................................ 9 1. Airplanes............................................. 9 2. Spares Affected. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 B. Concurrent Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 C. Reason. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 D. Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 E. Compliance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 F. Approval. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 G. Manpower. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 H. Weight and Balance Changes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 I. Electrical Load Data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 J. References. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 1. Existing Data:. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 2. Data Supplied with this Service Bulletin:. . . . . . . . . . . . . . . . . . . . . . . . . . . 23 3. Installation Drawings Used in the Preparation of this Service Bulletin:. . . . . . . . . . . 23 K. Publications Affected. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 L. Interchangeability and Intermixability of Parts. . . . . . . . . . . . . . . . . . . . . . . . . . . 24 M. Software Accomplishment Summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 2. MATERIAL INFORMATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 A. Material - Price and Availability. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 B. Industry Support Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 C. Parts Necessary for Each Airplane. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 1. Kits/Parts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 2. Parts and Materials Supplied by the Operator. . . . . . . . . . . . . . . . . . . . . . . . 26 3. Parts Modified and Reidentified. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 4. Parts Removed and Not Replaced. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 D. Parts Necessary to Change Spares. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 E. Special Tooling - Price and Availability. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 F. Special Tooling Necessary to do this Service Bulletin. . . . . . . . . . . . . . . . . . . . . . . 26 3. ACCOMPLISHMENT INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 A. GENERAL INFORMATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 B. WORK INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 FIGURE 1: LEFT HORIZONTAL STABILIZER - REAR SPAR ATTACH LOCATION - PIN REPLACEMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 FIGURE 2: LEFT HORIZONTAL STABILIZER - REAR SPAR ATTACH LOCATION - GUSSET AND BRACKET ASSEMBLY INSTALLATION. . . . . . . . . . . . . . . . . . . . . . . . . . . 38 FIGURE 3: RIGHT HORIZONTAL STABILIZER - REAR SPAR ATTACH LOCATION - PIN REPLACEMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 FIGURE 4: RIGHT HORIZONTAL STABILIZER - REAR SPAR ATTACH LOCATION - BRACKET AND GUSSET ASSEMBLY INSTALLATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 09, 2012 737-55-1093 3 of 47 **BOEING SERVICE BULLETIN 737-55-1093**Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 09, 2012 737-55-1093 4 of 47 **BOEING SERVICE BULLETIN 737-55-1093**

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### Commercial **Airplanes** 

# 737 Service Bulletin **SPECIAL ATTENTION Summary**  **Number: 737-55-1093** Original Issue: April 09, 2012 ATA System: 5510 **SUBJECT:** STABILIZERS - Horizontal Stabilizer - Replacement of Rear Spar Attach Pins With Unapproved Surface Coating BOEING RECOMMENDS THAT EACH OPERATOR EXAMINE THIS SERVICE BULLETIN IMMEDIATELY. **CONCURRENT REQUIREMENTS** None. **BACKGROUND** Boeing has found that pins with an unapproved surface coating may be installed at the horizontal stabilizer rear spar attach locations. An incorrect procedure to apply the surface coating was used by a supplier. The pins were installed on new airplanes and were also distributed by Boeing Spares. If pins with unapproved surface coating are not replaced they could fail prematurely in-service, causing reduced structural integrity of the horizontal stabilizer to fuselage intersection which could possibly result in loss of control of the airplane. A large number of 180A1612-3 and 180A1612-4 pins that were supplied to Boeing between June 30, 2006 and January 31, 2008 have an unapproved surface coating. These pins were distributed by Boeing Spares between June 30, 2006 and June 17, 2008 and were installed on most new airplanes delivered between August 2006 and July 2008. These pins could also have been installed as terminating action for Boeing Service Bulletin 737-55-1086 or during maintenance in accordance with 737-600/700/800/900 MPD Section 9. No practical non-destructive inspection procedures exist to determine whether the pins have an approved or unapproved surface coating. This service bulletin gives instructions to replace all 180A1612-3 and 180A1612-4 pins. Boeing Service Related Problem (SRP) 737NG-SRP-55-0046 and Boeing Fleet Team Digest (FTD) 737NG-FTD-55-08002 are related to this service bulletin. This table is provided to operators for planning purposes only. Refer to the applicable sections for more information.
**Reference Affected**  **Planning Data** Paragraph 1.A.2., Spares Affected Yes Spares Affected Paragraph 1.E., Compliance Yes AD Related Paragraph 1.H., Weight and Balance Changes No Weight and Balance Change Paragraph 1.I., Electrical Load Data No Electrical Load Changed

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 09, 2012 737-55-1093 5 of 47**Reference Affected**  **Planning Data** Paragraph 1.K., Publications Affected Yes Publications Affected Paragraph 1.K., Publications Affected No Airplane Flight Operations Affected (Flight CrewOperations Manual and/or FAA Approved Airplane Flight Manual) Paragraph 2.C.1., Kits/Parts Yes Kits/Parts Required Paragraph 2.C.2., Parts and Materials Supplied by the Operator Yes Operator Supplied Material Paragraph 2.F., Special Tooling Necessary to do this Service Bulletin No Special Tooling Required

**ACTION** Support the horizontal stabilizer(s) and disconnect, lock and configure horizontal stabilizer systems. Open tailcone access door and remove access panels to get access to the pins. Replace the pins. Install all removed parts and access panels and close the tailcone access door. Restore horizontal stabilizer systems and remove horizontal stabilizer support. Put the airplane back to a serviceable condition. **EFFECTIVITY** 737-600/700/700C/800/900/900ER Airplanes. Refer to Paragraph 1.A.1., Airplanes, for the list of affected airplanes. **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. Replace all 180A1612-3 pins and 180A1612-4 pins with 180A1612-7 pins and 180A1612-8 pins in accordance with Paragraph 3.B., Work Instructions, PART 2, before 56,000 total flight cycles or within 3,000 flight cycles after the original issue date of this service bulletin, whichever occurs later. **NOTE:**No work is necessary at any location where a 180A1612-7 or a 180A1612-8 pin is installed. **INDUSTRY SUPPORT INFORMATION** Boeing warranty remedies are available for airplanes in warranty as of July 24, 2008. Please refer to Paragraph 2.B., Industry Support Information. **MANPOWER Elapsed Hours**  **Total Task Hours Airplanes**  19.30 38.70 All Refer to Paragraph 1.G., Manpower.

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 09, 2012 737-55-1093 6 of 47 **BOEING SERVICE BULLETIN 737-55-1093 MATERIAL INFORMATION**  Boeing Supplied Kits/Parts. Refer to Paragraph 2.A., Material - Price and Availability.

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 09, 2012 737-55-1093 7 of 47 **BOEING SERVICE BULLETIN 737-55-1093**Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 09, 2012 737-55-1093 8 of 47 **BOEING SERVICE BULLETIN 737-55-1093**

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### Commercial **Airplanes** 

# 737 Service Bulletin **SPECIAL ATTENTION Number: 737-55-1093**  Original Issue: April 09, 2012 ATA System: 5510 **SUBJECT:** STABILIZERS - Horizontal Stabilizer - Replacement of Rear Spar Attach Pins With Unapproved Surface Coating BOEING RECOMMENDS THAT EACH OPERATOR EXAMINE THIS SERVICE BULLETIN IMMEDIATELY. **1. PLANNING INFORMATION A. Effectivity**  1. Airplanes Refer to Service Bulletin Index Document D6-19567 Part 3 for Airplane Variable Number, Line Number, and Serial Number data. This service bulletin is for the airplanes shown below.
**DESCRIPTION CONFIGURATION**  **GROUP** 737-600, 737-700, 737-700C, 737-800, 737-900 and 737-900ER airplanes line number 1-3534, excluding P-8A airplanes. - 1

Airplane Models: 737-600, 737-700, 737-700C, 737-800, 737-900, 737-900ER **Group Variable Number**  1 YA001 - YA099 1 YA101 - YA199 1 YA201 - YA211 1 YA221 1 YA231 - YA242 1 YA251 - YA256 1 YA271 - YA272 1 YA291

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 09, 2012 737-55-1093 9 of 47**Group Variable Number**  1 YA301 - YA302 1 YA311 - YA314 1 YA321 - YA323 1 YA336 - YA345 1 YA351 1 YA356 - YA357 1 YA366 - YA367 1 YA371 - YA377 1 YA501 - YA536 1 YA541 - YA552 1 YA571 - YA578 1 YA601 - YA615 1 YA621 - YA622 1 YA626 - YA631 1 YA635 - YA636 1 YA641 - YA642 1 YA645 - YA650 1 YA656 - YA659 1 YA666 - YA667 1 YA671 - YA672 1 YA681 - YA691 1 YA701 - YA710 1 YA721 - YA722 1 YA731 - YA734 1 YA751 - YA756 1 YA801 - YA803 1 YA809 1 YA811 - YA814 1 YA831 - YA835 1 YA841 - YA862 1 YA881 - YA882 1 YA891 - YA892 1 YA961 - YA978

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 09, 2012 737-55-1093 10 of 47 **BOEING SERVICE BULLETIN 737-55-1093 Group**  **Variable Number** 1 YB001 - YB006 1 YB101 - YB132 1 YB151 - YB153 1 YB156 - YB158 1 YB161 - YB164 1 YB171 - YB172 1 YB181 - YB184 1 YB201 - YB208 1 YB271 1 YB276 1 YB301 - YB310 1 YB371 - YB392 1 YB501 - YB502 1 YB521 - YB526 1 YB541 - YB544 1 YB551 1 YB561 - YB598 1 YB601 - YB635 1 YB651 1 YB656 1 YB671 - YB672 1 YB851 - YB863 1 YB871 - YB874 1 YB881 - YB893 1 YB901 - YB903 1 YB911 1 YB961 - YB975 1 YB981 1 YB986 - YB996 1 YC001 - YC030 1 YC051 - YC084 1 YC091 - YC095 1 YC101 - YC104

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 09, 2012 737-55-1093 11 of 47 **BOEING SERVICE BULLETIN 737-55-1093 Group**  **Variable Number** 1 YC111 - YC113 1 YC121 1 YC126 - YC127 1 YC136 - YC141 1 YC146 - YC147 1 YC151 - YC156 1 YC166 - YC171 1 YC176 - YC179 1 YC186 - YC190 1 YC201 - YC203 1 YC206 - YC207 1 YC301 - YC305 1 YC321 - YC387 1 YC391 - YC394 1 YC396 1 YC401 - YC417 1 YC421 - YC422 1 YC426 - YC428 1 YC436 - YC439 1 YC441 - YC448 1 YC451 - YC455 1 YC459 1 YC461 - YC467 1 YC471 - YC499 1 YC501 - YC526 1 YC571 - YC583 1 YC587 - YC589 1 YC591 - YC593 1 YC601 - YC655 1 YC681 - YC696 1 YC701 - YC715 1 YC720 - YC725 1 YC727 - YC752

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 09, 2012 737-55-1093 12 of 47 **BOEING SERVICE BULLETIN 737-55-1093 Group**  **Variable Number** 1 YC761 - YC770 1 YC781 - YC793 1 YC801 - YC892 1 YC901 - YC907 1 YC921 - YC922 1 YC931 - YC932 1 YC941 - YC951 1 YC971 - YC978 1 YC981 - YC983 1 YD001 - YD007 1 YD021 - YD025 1 YD041 - YD057 1 YD081 - YD084 1 YD101 - YD113 1 YD121 - YD126 1 YD151 - YD159 1 YD171 - YD172 1 YD201 - YD203 1 YD206 - YD209 1 YD216 - YD219 1 YD251 - YD254 1 YD256 - YD257 1 YD261 1 YD301 - YD334 1 YD391 1 YD401 - YD410 1 YD412 - YD417 1 YD481 - YD485 1 YD491 - YD499 1 YD501 - YD512 1 YD531 - YD535 1 YD541 - YD547 1 YD561 - YD564

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 09, 2012 737-55-1093 13 of 47 **BOEING SERVICE BULLETIN 737-55-1093 Group**  **Variable Number** 1 YD571 - YD572 1 YD591 - YD595 1 YD601 - YD612 1 YD651 - YD655 1 YE001 - YE020 1 YE051 1 YE101 - YE109 1 YE151 - YE157 1 YE171 - YE172 1 YE201 - YE206 1 YE301 - YE305 1 YE321 - YE326 1 YE371 - YE383 1 YF001 - YF011 1 YF021 - YF049 1 YF051 - YF065 1 YF086 - YF087 1 YF106 - YF107 1 YF111 - YF114 1 YF116 - YF119 1 YF121 - YF128 1 YF176 - YF178 1 YF191 - YF192 1 YF201 - YF276 1 YF401 - YF402 1 YF431 - YF432 1 YF441 - YF442 1 YF451 - YF460 1 YF501 - YF599 1 YF601 - YF604 1 YF701 - YF707 1 YF801 - YF803 1 YF831 - YF832

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 09, 2012 737-55-1093 14 of 47 **BOEING SERVICE BULLETIN 737-55-1093 Group**  **Variable Number** 1 YF836 - YF838 1 YF901 - YF905 1 YF921 - YF927 1 YF951 1 YG001 - YG044 1 YG061 - YG064 1 YG066 - YG089 1 YG091 - YG099 1 YG101 - YG104 1 YG111 - YG114 1 YG116 - YG128 1 YG201 - YG205 1 YG211 - YG214 1 YG221 - YG224 1 YG251 - YG252 1 YG501 - YG511 1 YG601 - YG602 1 YG701 1 YG711 1 YH001 - YH012 1 YH031 - YH055 1 YH071 - YH078 1 YH101 - YH132 1 YH201 - YH202 1 YH206 - YH207 1 YH301 - YH306 1 YH321 - YH322 1 YJ001 - YJ013 1 YJ021 1 YJ471 - YJ480 1 YJ501 - YJ517 1 YJ531 - YJ579 1 YJ591 - YJ599

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 09, 2012 737-55-1093 15 of 47 **BOEING SERVICE BULLETIN 737-55-1093 Group**  **Variable Number** 1 YJ631 - YJ632 1 YJ671 - YJ694 1 YJ801 - YJ867 1 YJ871 - YJ880 1 YJ901 - YJ904 1 YJ908 - YJ929 1 YJ931 - YJ937 1 YJ941 - YJ956 1 YJ961 1 YJ976 - YJ977 1 YK001 - YK007 1 YK101 - YK104 1 YK111 - YK112 1 YK121 - YK122 1 YK131 - YK133 1 YK136 - YK139 1 YK141 - YK142 1 YK146 - YK148 1 YK151 - YK154 1 YK161 - YK167 1 YK171 1 YK176 - YK177 1 YK186 1 YK191 1 YK196 1 YK201 - YK202 1 YK301 - YK314 1 YK321 - YK340 1 YK361 - YK378 1 YK401 - YK406 1 YK426 - YK427 1 YK431 - YK450 1 YK456 - YK467

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 09, 2012 737-55-1093 16 of 47 **BOEING SERVICE BULLETIN 737-55-1093 Group**  **Variable Number** 1 YK471 - YK473 1 YK476 1 YK480 - YK487 1 YK491 1 YK495 - YK498 1 YK511 - YK516 1 YK521 - YK530 1 YK551 - YK571 1 YK576 - YK577 1 YK580 - YK585 1 YK601 - YK602 1 YK606 - YK607 1 YK611 - YK616 1 YK621 - YK634 1 YK641 - YK644 1 YK651 - YK665 1 YK671 - YK672 1 YK676 - YK677 1 YK681 - YK686 1 YK691 1 YK701 - YK713 1 YK716 - YK719 1 YK721 - YK741 1 YK751 - YK770 1 YK776 - YK778 1 YK781 - YK785 1 YK791 - YK792 1 YK796 - YK797 1 YK801 - YK899 1 YK901 - YK912 1 YK918 - YK919 1 YK921 - YK928 1 YK941 - YK959

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 09, 2012 737-55-1093 17 of 47 **BOEING SERVICE BULLETIN 737-55-1093 Group**  **Variable Number** 1 YK961 - YK996 1 YL001 - YL005 1 YL011 - YL016 1 YL021 - YL024 1 YL051 - YL052 1 YL056 - YL057 1 YL061 1 YL066 - YL069 1 YL076 - YL077 1 YL101 - YL136 1 YL201 - YL226 1 YL271 - YL272 1 YL281 - YL284 1 YL301 - YL303 1 YL311 - YL314 1 YL316 - YL321 1 YL351 - YL353 1 YL371 - YL374 1 YL401 1 YL421 - YL429 1 YL431 - YL444 1 YL461 - YL478 1 YL501 - YL509 1 YL531 - YL534 1 YL541 - YL544 1 YL561 - YL569 1 YL591 - YL598 1 YL601 - YL606 1 YL611 - YL612 1 YL616 - YL617 1 YL621 1 YL626 1 YL631 - YL634

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 09, 2012 737-55-1093 18 of 47 **BOEING SERVICE BULLETIN 737-55-1093 Group**  **Variable Number** 1 YL636 - YL637 1 YL661 - YL664 1 YL676 - YL681 1 YL691 1 YL696 - YL697 1 YL701 - YL706 1 YL731 1 YL751 - YL752 1 YL756 - YL757 1 YL761 - YL779 1 YL796 - YL797 1 YL801 - YL815 1 YL901 - YL910 1 YL921 - YL940 1 YL951 - YL968 1 YM101 - YM103 1 YM201 - YM242 1 YM251 - YM299 1 YM301 - YM398 1 YM471 1 YM481 - YM484 1 YM501 - YM515 1 YM521 - YM522 1 YM541 1 YM551 - YM553 1 YM571 - YM572 1 YM581 - YM582 1 YM591 - YM599 1 YM631 - YM634 1 YM641 - YM652 1 YM671 - YM674 1 YM691 - YM698 1 YM701 - YM710

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 09, 2012 737-55-1093 19 of 47 **BOEING SERVICE BULLETIN 737-55-1093 Group**  **Variable Number** 1 YM761 - YM765 1 YN001 - YN016 1 YN021 - YN024 1 YN061 1 YN071 - YN082 1 YN091 - YN092 1 YN101 - YN112 1 YN121 1 YN201 - YN202 1 YN211 - YN219 1 YN231 - YN236 1 YN261 1 YN501 1 YQ001 - YQ003 1 YQ011 - YQ018 1 YQ026 - YQ027 1 YQ036 - YQ042 1 YQ201 1 YQ231 1 YQ241 - YQ242 1 YQ291 - YQ295 1 YQ401 - YQ403 1 YR001 - YR005 1 YR051 - YR053 1 YR101 1 YR111 - YR112 1 YR126 1 YR166 1 YR201 - YR203 1 YR231 - YR233

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 09, 2012 737-55-1093 20 of 47 **BOEING SERVICE BULLETIN 737-55-1093**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** Boeing has found that pins with an unapproved surface coating may be installed at the horizontal stabilizer rear spar attach locations. An incorrect procedure to apply the surface coating was used by a supplier. The pins were installed on new airplanes and were also distributed by Boeing Spares. If pins with unapproved surface coating are not replaced they could fail prematurely in-service, causing reduced structural integrity of the horizontal stabilizer to fuselage intersection which could possibly result in loss of control of the airplane. A large number of 180A1612-3 and 180A1612-4 pins that were supplied to Boeing between June 30, 2006 and January 31, 2008 have an unapproved surface coating. These pins were distributed by Boeing Spares between June 30, 2006 and June 17, 2008 and were installed on most new airplanes delivered between August 2006 and July 2008. These pins could also have been installed as terminating action for Boeing Service Bulletin 737-55-1086 or during maintenance in accordance with 737-600/700/800/900 MPD Section 9. No practical non-destructive inspection procedures exist to determine whether the pins have an approved or unapproved surface coating. This service bulletin gives instructions to replace all 180A1612-3 and 180A1612-4 pins. Boeing Service Related Problem (SRP) 737NG-SRP-55-0046 and Boeing Fleet Team Digest (FTD) 737NG-FTD-55-08002 are related to this service bulletin. **D. Description** Support the horizontal stabilizer(s) and disconnect, lock and configure horizontal stabilizer systems. Open tailcone access door and remove access panels to get access to the pins. Replace the pins. Install all removed parts and access panels and close the tailcone access door. Restore horizontal stabilizer systems and remove horizontal stabilizer support. Put the airplane back to a serviceable condition. **NOTE:**The actions of this service bulletin do not impact the compliance of Boeing Service Bulletin 737-55-1086 or the compliance of 737-600/700/800/900 MPD Section 9 requirements related to it. The work in this service bulletin is done in the maintenance zone(s) given below.
**Affected Maintenance Zones Zone**  **Model** 313, 314, 317, 318, 333, 343 737-600, 737-700, 737-700C, 737-800, 737-900, 737-900ER

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 09, 2012 737-55-1093 21 of 47 **BOEING SERVICE BULLETIN 737-55-1093 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. Replace all 180A1612-3 pins and 180A1612-4 pins with 180A1612-7 pins and 180A1612-8 pins in accordance with Paragraph 3.B., Work Instructions, PART 2, before 56,000 total flight cycles or within 3,000 flight cycles after the original issue date of this service bulletin, whichever occurs later. **NOTE:**No work is necessary at any location where a 180A1612-7 or a 180A1612-8 pin is installed. **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. The Manager of the FAA Seattle Aircraft Certification Office approves the replacement of the rear spar pins per the Accomplishment Instructions in SB 737-55-1093, Original Issue, as an alternative method of compliance to the inspection or replacement of the rear spar pins required by paragraphs (a), (b), (c), (d) and (e) of AD 2004-05-19. All other provisions of AD 2004-05-19 not specifically referenced in this paragraph remain fully applicable and must be complied with accordingly. **G. Manpower** The table below shows an estimate of the task hours necessary to do this service bulletin 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. **Elapsed Hours Task-Hours**  **Number of Persons**  **Task**
1.90 7.60 4 Open access 4.00 8.00 2 FIGURE 1 (a) 3.75 3.75 1 FIGURE 2 (b)

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 09, 2012 737-55-1093 22 of 47 **BOEING SERVICE BULLETIN 737-55-1093 Elapsed Hours**  **Task-Hours Number of**  **Persons Task** 
4.00 8.00 2 FIGURE 3 (a) 3.75 3.75 1 FIGURE 4 (b) 7.60 7.60 4 Close access 19.30 38.70 Total per Airplane(a) Some of the work in this figure is optional for access and may not be necessary. (b) This figure closes optional access and may not be necessary. **H. Weight and Balance Changes** None. **I. Electrical Load Data** Not changed. **J. References** 1. Existing Data: a. Boeing Service Bulletin 737-55-1086 b. Boeing Service Related Problem (SRP) 737NG-SRP-55-0046 c. Standard Overhaul Practices Manual (SOPM) 20-30-03 d. 737-600/700/800/900 Aircraft Maintenance Manual (AMM) 06-42-00, 27-31-00, 27-41-11 e. 737-600/700/800/900 Maintenance Planning Data (MPD) Section 9 f. 737NG Fleet Team Digest (FTD) 737NG-FTD-55-08002 2. Data Supplied with this Service Bulletin: None. 3. Installation Drawings Used in the Preparation of this Service Bulletin:
**Title Drawing Number**  INTEGRATION INSTL - HORIZONTAL STABILIZER 180A1610 RIB ASSY/INSTL - INBD CLOSURE, HORIZ. STAB. 182A5001 PANEL INSTL - GAP COVER, HORIZ STAB 186A3001

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 09, 2012 737-55-1093 23 of 47 **BOEING SERVICE BULLETIN 737-55-1093**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** 1. Publications: **Chapter-Section Publication**  55-10 737 Illustrated Parts Catalog 55-10-07 Component Maintenance Manual 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 affects FCS but no new DTIs are necessary. **L. Interchangeability and Intermixability of Parts** Accomplishment of this service bulletin does not affect interchangeability or intermixability of parts. **M. Software Accomplishment Summary** Not affected.

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 09, 2012 737-55-1093 24 of 47 **BOEING SERVICE BULLETIN 737-55-1093 2. MATERIAL INFORMATION**  **A. Material - Price and Availability** Boeing can supply the kits shown in Paragraph 2.C., Parts Necessary for Each Airplane. Operators are encouraged to share schedule requirements with Boeing for incorporation of the service bulletin. The kits are subject to the terms and conditions of the Boeing standard purchase order acknowledgment. Prices are in United States Dollars. Terms: Net 30 days. Reference this service bulletin and submit your purchase order by one of these methods: 1. Order on-line via ATA Spec 2000 or The Boeing PART Page 2. Fax to (206) 662-7145 **REFER TO THE BOEING PART PAGE ON MYBOEINGFLEET.COM OR CONTACT FIRST RESPONDER AT FR@BOEING.COM FOR THE LATEST REORDER LEAD TIME (ROLT) AND PRICE INFORMATION** 
**Unit Price as of the original issue** **date of this Ser**

**vice Bulletin (US Dollars)**  **ROLT as of the original issue** **date of this Ser**

**vice Bulletin (Calendar Days)**  **QTY Date**  **Name Kit Number** 

6,312.00 570 31 03/22/12 TOP KIT - RETROFIT- HORIZONTAL STABILIZER ATTACH PINS 002A0001-95

**B. Industry Support Information** As a result of the condition described in this service bulletin, upon accumulation of 50,000 total flight cycles, operators may submit their purchase order for the service bulletin kit/parts at no charge for such airplane if in-warranty as of July 24, 2008. In the event you plan on replacing pins prior to the normal maintenance interval of 56,000 total flight cycles, please submit your request for warranty remedies to your Warranty Regional Manager providing your planned incorporation date as well as reason for replacing the pins prior to 56,000 total flight cycles. As a result of normal maintenance, operators normally remove and inspect the horizontal stabilizer pins so no warranty labor remedy is available. **C. Parts Necessary for Each Airplane** 1. Kits/Parts To get the kits/parts shown below, refer to Paragraph 2.A., Material - Price and Availability. **NOTE:**One top kit and the items shown in Paragraph 2.C.2., Parts and Materials Supplied by the Operator, are necessary for each airplane.

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 09, 2012 737-55-1093 25 of 47 **BOEING SERVICE BULLETIN 737-55-1093 Kit 002A0001-95** 
**Notes Existing Part**  **Number Name**  **QTY New Part**  **Number**

- TOP KIT - RETROFIT - HORIZONTAL STABILIZER ATTACH PINS - 002A0001-95 (a) 180A1612-3 PIN- REAR SPAR UPPER 2 180A1612-7 (a) 180A1612-4 PIN- REAR SPAR 4 180A1612-8 (a) Discard the existing part. You cannot use the existing part to replace the new or changed part. 2. Parts and Materials Supplied by the Operator
**Notes Name**  **QTY Part Number /**  **Specification** (a) CORROSION INHIBITING MATERI- AL, NON-DRYING PASTE 8oz BMS3-38 (a) See the Qualified Products List at the end of the Boeing Material Specification (BMS) for supplier data.
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.

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 09, 2012 737-55-1093 26 of 47 **BOEING SERVICE BULLETIN 737-55-1093 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. Manual titles are referred to by acronyms. Refer to Paragraph 1.J., References, for definition of the acronyms. 2. Obey all of the warnings and cautions given in the specified manual sections. 3. Unless shown differently, these dimensions and tolerances are used: – Torque limits to tighten nuts and bolts are in 737 SRM, Chapter 51 4. Use the approved fastener and process material substitutions in accordance with 737 SRM, Chapter 51. Alternate fasteners are listed in 737 SRM Chapter 51. 5. If the length of any fastener specified in this service bulletin does not meet the installation standards in SRM Chapter 51, then a fastener of the same specification, or an approved substitute, with a length which meets the installation standards in SRM Chapter 51 may be used. 6. 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. 7. If it is necessary to remove more parts for access, you can remove those parts. If you can get access without removing identified parts, it is not necessary to removal all of the identified parts. Jacking and shoring limitations must be observed. 8. Where the work instructions include installation of a kept part, a new or serviceable part with the same part number can be installed as an alternative to the kept part. The removed part can be discarded if a new or serviceable part is installed. **B. WORK INSTRUCTIONS PART 1 - OPEN ACCESS**  1. Do the following to get access to the pins at the left horizontal stabilizer rear spar attach locations as necessary: **NOTE:**The open access steps for the left and right horizontal stabilizers can be done concurrently. a. Support the weight of the left horizontal stabilizer. Refer to 737-600/700/800/900 AMM 27-41-11 as an accepted procedure.

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 09, 2012 737-55-1093 27 of 47 **BOEING SERVICE BULLETIN 737-55-1093 NOTE:** The horizontal stabilizer and elevator assembly weigh approximately 874 pounds. b. Remove hydraulic pressure from system A and B. Refer to 737-600/700/800/900 AMM 27-31-00 as an accepted procedure. c. Set the stabilizer trim cutout switches (located on the control stand) to the cutout position. d. Open the following circuit breakers and install safety tags. **F/O Electrical System Panel, P6-2**
**Name Number**  **Col Row**  FLIGHT CONTROL STAB TRIM CONT C00207 10 B FLIGHT CONTROL STAB TRIM ACTUATOR C00840 10 D **CAPT Electrical System Panel, P18-1**
**Name Number**  **Col Row**  AFCS STABILIZER TRIM C00849 2 C **CAPT Electrical System Panel, P18-2**
**Name Number**  **Col Row**  FLIGHT RECORDER POSITION SENSOR C00544 8 C **CAPT Electrical System Panel, P18-3**
**Name Number**  **Col Row**  EXTERIOR LIGHTING LOGO ILLUM (a) C00644 15 A (a) If installed. e. Use the stabilizer trim wheel on the control stand to set the horizontal stabilizer at zero degrees (4 units of trim). f. Install lock F71336-501 on the stabilizer trim wheel at the control stand. Refer to 737-600/700/800/900 AMM 27-41-11 as an accepted procedure. (1) Turn the trim wheel to put the handle at the top of the wheel. (2) Adjust the height of the trim lock to put the trim wheel handle correctly on the yoke. (3) Install the pin through the yoke. (4) Install the safety pin. g. Open the Tailcone Access Door, 318BR. Refer to 737-600/700/800/900 AMM 27-41-11 as an accepted procedure.

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 09, 2012 737-55-1093 28 of 47 **BOEING SERVICE BULLETIN 737-55-1093**h. Remove the following access panels as necessary. Refer to 737-600/700/800/900 AMM 06-42-00.
**Name Number** Horizontal Stabilizer, Gap Cover, Horizontal Stabilizer to Body 332ABHorizontal Stabilizer, Gap Cover, Horizontal Stabilizer to Body 332AT Horizontal Stabilizer, Gap Cover, Horizontal Stabilizer to Body 333ABHorizontal Stabilizer, Gap Cover, Horizontal Stabilizer to Body 333AT
2. Do the following to get access to the pins at the right horizontal stabilizer rear spar attach locations as necessary: **NOTE:**The open access steps for the left and right horizontal stabilizers can be done concurrently. a. Support the weight of the right horizontal stabilizer. Refer to 737-600/700/800/900 AMM 27-41-11 as an accepted procedure. **NOTE:**The horizontal stabilizer and elevator assembly weigh approximately 874 pounds. b. Remove hydraulic pressure from system A and B. Refer to 737-600/700/800/900 AMM 27-31-00 as an accepted procedure. c. Set the stabilizer trim cutout switches (located on the control stand) to the cutout position. d. Open the following circuit breakers and install safety tags. **F/O Electrical System Panel, P6-2**
**Name Number**  **Col Row**  FLIGHT CONTROL STAB TRIM CONT C00207 10 B FLIGHT CONTROL STAB TRIM ACTUATOR C00840 10 D **CAPT Electrical System Panel, P18-1**
**Name Number**  **Col Row**  AFCS STABILIZER TRIM C00849 2 C **CAPT Electrical System Panel, P18-2**
**Name Number**  **Col Row**  FLIGHT RECORDER POSITION SENSOR C00544 8 C

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 09, 2012 737-55-1093 29 of 47 **BOEING SERVICE BULLETIN 737-55-1093 CAPT Electrical System Panel, P18-3** 
**Name Number**  **Col Row**  EXTERIOR LIGHTING LOGO ILLUM (a) C00644 15 A (a) If installed. e. Use the stabilizer trim wheel on the control stand to set the horizontal stabilizer at zero degrees (4 units of trim). f. Install lock F71336-501 on the stabilizer trim wheel at the control stand. Refer to 737-600/700/800/900 AMM 27-41-11 as an accepted procedure. (1) Turn the trim wheel to put the handle at the top of the wheel. (2) Adjust the height of the trim lock to put the trim wheel handle correctly on the yoke. (3) Install the pin through the yoke. (4) Install the safety pin. g. Open the Tailcone Access Door, 318BR. Refer to 737-600/700/800/900 AMM 27-41-11 as an accepted procedure. h. Remove the following access panels as necessary. Refer to 737-600/700/800/900 AMM 06-42-00.
**Name Number** Horizontal Stabilizer, Gap Cover, Horizontal Stabilizer to Body 342ABHorizontal Stabilizer, Gap Cover, Horizontal Stabilizer to Body 342AT Horizontal Stabilizer, Gap Cover, Horizontal Stabilizer to Body 343ABHorizontal Stabilizer, Gap Cover, Horizontal Stabilizer to Body 343AT

**PART 2 - PIN REPLACEMENT** 1. Replace each 180A1612-3 and 180A1612-4 pin installed at the left horizontal stabilizer rear spar attach location in accordance with FIGURE 1. a. If the gusset and/or bracket assemblies were removed for access, reinstall them in accordance with FIGURE 2. 2. Replace each 180A1612-3 and 180A1612-4 pin installed at the right horizontal stabilizer rear spar attach location in accordance with FIGURE 3.

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 09, 2012 737-55-1093 30 of 47 **BOEING SERVICE BULLETIN 737-55-1093**a. If the gusset and/or bracket assemblies were removed for access, reinstall them in accordance with FIGURE 4. **PART 3 - CLOSE ACCESS** 1. Do the following to close access to the pins at the left horizontal stabilizer rear spar attach locations as necessary: **NOTE:**The close access steps for the left and right horizontal stabilizers can be done concurrently. a. Install the following access panels. Refer to 737-600/700/800/900 AMM 06-42-00.
**Name Number** Horizontal Stabilizer, Gap Cover, Horizontal Stabilizer to Body 332ABHorizontal Stabilizer, Middle Top Gap Cover 332AT Horizontal Stabilizer, Gap Cover, Horizontal Stabilizer to Body 333ABHorizontal Stabilizer, Aft Top Gap Cover 333AT b. Close the Tailcone Access Door, 318BR. Refer to 737-600/700/800/900 AMM 27-41-11 as an accepted procedure. c. Remove the lock, F71336-501 from the stabilizer trim wheel at the control stand. d. Set the stabilizer trim cutout switches to the NORMAL position. e. Remove the safety tags and close the following circuit breakers: **F/O Electrical System Panel, P6-2**
**Name Number**  **Col Row**  FLIGHT CONTROL STAB TRIM CONT C00207 10 B FLIGHT CONTROL STAB TRIM ACTUATOR C00840 10 D **CAPT Electrical System Panel, P18-1**
**Name Number**  **Col Row**  AFCS STABILIZER TRIM C00849 2 C **CAPT Electrical System Panel, P18-2**
**Name Number**  **Col Row**  FLIGHT RECORDER POSITION SENSOR C00544 8 C

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 09, 2012 737-55-1093 31 of 47 **BOEING SERVICE BULLETIN 737-55-1093 CAPT Electrical System Panel, P18-3** 
**Name Number**  **Col Row**  EXTERIOR LIGHTING LOGO ILLUM (a) C00644 15 A (a) If installed. f. Restore hydraulic pressure to system A and B. Refer to 737-600/700/800/900 AMM 27-31-00 as an accepted procedure. g. Remove the support from the left horizontal stabilizer. 2. Do the following to close access to the pins at the right horizontal stabilizer rear spar attach locations as necessary: **NOTE:**The close access steps for the left and right horizontal stabilizers can be done concurrently. a. Install the following access panels. Refer to 737-600/700/800/900 AMM 06-42-00.
**Name Number** Horizontal Stabilizer, Gap Cover, Horizontal Stabilizer to Body 342ABHorizontal Stabilizer, Middle Top Gap Cover 342AT Horizontal Stabilizer, Gap Cover, Horizontal Stabilizer to Body 343ABHorizontal Stabilizer, Aft Top Gap Cover 343AT b. Close the Tailcone Access Door, 318BR. Refer to 737-600/700/800/900 AMM 27-41-11 as an accepted procedure. c. Remove the lock, F71336-501 from the stabilizer trim wheel at the control stand. d. Set the stabilizer trim cutout switches to the NORMAL position. e. Remove the safety tags and close the following circuit breakers: **F/O Electrical System Panel, P6-2**
**Name Number**  **Col Row**  FLIGHT CONTROL STAB TRIM CONT C00207 10 B FLIGHT CONTROL STAB TRIM ACTUATOR C00840 10 D **CAPT Electrical System Panel, P18-1**
**Name Number**  **Col Row**  AFCS STABILIZER TRIM C00849 2 C

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 09, 2012 737-55-1093 32 of 47 **BOEING SERVICE BULLETIN 737-55-1093 CAPT Electrical System Panel, P18-2** 
**Name Number**  **Col Row**  FLIGHT RECORDER POSITION SENSOR C00544 8 C **CAPT Electrical System Panel, P18-3**
**Name Number**  **Col Row**  EXTERIOR LIGHTING LOGO ILLUM (a) C00644 15 A (a) If installed. f. Restore hydraulic pressure to system A and B. Refer to 737-600/700/800/900 AMM 27-31-00 as an accepted procedure. g. Remove the support from the right horizontal stabilizer. 3. Put the airplane back to a serviceable condition.

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 09, 2012 737-55-1093 33 of 47 **BOEING SERVICE BULLETIN 737-55-1093 FIGURE 1: LEFT HORIZONTAL STABILIZER - REAR SPAR ATTACH LOCATION - PIN REPLACEMENT**  **(SHEET 1 OF 4)** Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 09, 2012 737-55-1093 34 of 47 **BOEING SERVICE BULLETIN 737-55-1093 FIGURE 1: LEFT HORIZONTAL STABILIZER - REAR SPAR ATTACH LOCATION - PIN REPLACEMENT**  **(SHEET 2 OF 4)** Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 09, 2012 737-55-1093 35 of 47 **BOEING SERVICE BULLETIN 737-55-1093**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**  (a) 2
- BOLT Remove / Keep 1 (a) 2
- NUT Remove / Keep Under the nut (a) 2
- WASHER Remove / Keep Under the bolt head (a) 2
- WASHER Remove / Keep (a) 17
- BOLT Remove / Keep 2 (a) 17
- NUT Remove / Keep Under the nut (a) 17
- WASHER Remove / Keep Under the bolt head (a) 17
- WASHER Remove / Keep (a) 1
- UPPER CLIP Remove / Keep 3 (a) 1
- GUSSET Remove / Keep (a) 1
- FORMER Remove / Keep (a) 1
- SEAL Remove / Keep (a) 1
- LOWER CLIP Remove / Keep (b) 5
- BOLT Remove / Keep 4 (b) 5
- NUT Remove / Keep (b) 1
- BRACKET Remove / Keep 5 (b) 1
- LOWER BRACKET Remove / Keep **CAUTION:**ONLY REMOVE ONE PIN AT A TIME FOR EACH STABILIZER. IF YOU REMOVE MORETHAN ONE PIN AT A TIME FOR EACH STABILIZER, DAMAGE TO THE HORIZONTAL STABILIZER STRUCTURE OR SYSTEMS MAY OCCUR. (c) 1 180A1612-3 PIN- REAR SPAR UP- PER Remove 6 (d)

- BMS3-38 CORROSION INHIBIT- ING MATERIAL Apply 7 (e) 1 180A1612-7 PIN- REAR SPAR UP- PER Install (New) 8

**FIGURE 1: LEFT HORIZONTAL STABILIZER - REAR SPAR ATTACH LOCATION - PIN REPLACEMENT (SHEET 3 OF 4)**  Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 09, 2012 737-55-1093 36 of 47 **BOEING SERVICE BULLETIN 737-55-1093 MORE DATA**  **QTY IDENTIFICATION**  **NAME TASK**  **STEP CAUTION:** ONLY REMOVE ONE PIN AT A TIME FOR EACH STABILIZER. IF YOU REMOVE MORETHAN ONE PIN AT A TIME FOR EACH STABILIZER, DAMAGE TO THE HORIZONTAL STABILIZER STRUCTURE OR SYSTEMS MAY OCCUR. (c) 1 180A1612-4 PIN- REAR SPAR Remove 9 (d)

- BMS3-38 CORROSION INHIBIT- ING MATERIAL Apply 10 (e) 1 180A1612-8 PIN- REAR SPAR Install (New) 11 **CAUTION:**ONLY REMOVE ONE PIN AT A TIME FOR EACH STABILIZER. IF YOU REMOVE MORETHAN ONE PIN AT A TIME FOR EACH STABILIZER, DAMAGE TO THE HORIZONTAL STABILIZER STRUCTURE OR SYSTEMS MAY OCCUR. (c) 1 180A1612-4 PIN- REAR SPAR Remove 12 (d)

- BMS3-38 CORROSION INHIBIT- ING MATERIAL Apply 13 (e) 1 180A1612-8 PIN- REAR SPAR Install (New) 14 (a) Removal of the Gusset Assembly is optional for access. The upper clip, gusset, former, seal and lower clip can be removed as an assembly. (b) Removal of the Aft Bracket Assembly is optional for access. The bracket and lower bracket can be removed as an assembly. (c) Remove the existing pin. Refer to 737-600/700/800/900 AMM 27-41-11 as an accepted procedure. (d) Clean the hole, refer to SOPM 20-30-03 as an accepted procedure. Apply corrosion inhibiting compound to the bolt and hole liberally, including the inner diameter of the bushing. (e) Install a new pin. Refer to 737-600/700/800/900 AMM 27-41-11 as an accepted procedure.

**FIGURE 1: LEFT HORIZONTAL STABILIZER - REAR SPAR ATTACH LOCATION - PIN REPLACEMENT (SHEET 4 OF 4)**  Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 09, 2012 737-55-1093 37 of 47 **BOEING SERVICE BULLETIN 737-55-1093 FIGURE 2: LEFT HORIZONTAL STABILIZER - REAR SPAR ATTACH LOCATION - GUSSET AND BRACKET**  **ASSEMBLY INSTALLATION (SHEET 1 OF 3)**  Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 09, 2012 737-55-1093 38 of 47 **BOEING SERVICE BULLETIN 737-55-1093 FIGURE 2: LEFT HORIZONTAL STABILIZER - REAR SPAR ATTACH LOCATION - GUSSET AND BRACKET**  **ASSEMBLY INSTALLATION (SHEET 2 OF 3)**  Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 09, 2012 737-55-1093 39 of 47 **BOEING SERVICE BULLETIN 737-55-1093**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**  (a) 1
- UPPER CLIP Install (Kept) 1 (a) 1
- GUSSET Install (Kept) (a) 1
- FORMER Install (Kept) (a) 1
- SEAL Install (Kept) (a) 1
- LOWER CLIP Install (Kept) 17
- BOLT Install (Kept) 2 17
- NUT Install (Kept) Under the nut 17
- WASHER Install (Kept) Under the bolt head 17
- WASHER Install (Kept) 2
- BOLT Install (Kept) 3 2
- NUT Install (Kept) Under the nut 2
- WASHER Install (Kept) Under the bolt head 2
- WASHER Install (Kept) (b) 1
- BRACKET Install (Kept) 4 (b) 1
- LOWER BRACKET Install (Kept) 5
- BOLT Install (Kept) 5 5
- NUT Install (Kept) (a) Install the upper clip, gusset, former, seal and lower clip as an assembly. (b) Install the bracket and lower bracket as an assembly.

**FIGURE 2: LEFT HORIZONTAL STABILIZER - REAR SPAR ATTACH LOCATION - GUSSET AND BRACKET ASSEMBLY INSTALLATION**  **(SHEET 3 OF 3)** Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 09, 2012 737-55-1093 40 of 47 **BOEING SERVICE BULLETIN 737-55-1093 FIGURE 3: RIGHT HORIZONTAL STABILIZER - REAR SPAR ATTACH LOCATION - PIN REPLACEMENT**  **(SHEET 1 OF 4)** Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 09, 2012 737-55-1093 41 of 47 **BOEING SERVICE BULLETIN 737-55-1093 FIGURE 3: RIGHT HORIZONTAL STABILIZER - REAR SPAR ATTACH LOCATION - PIN REPLACEMENT**  **(SHEET 2 OF 4)** Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 09, 2012 737-55-1093 42 of 47 **BOEING SERVICE BULLETIN 737-55-1093**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**  (a) 2
- BOLT Remove / Keep 1 (a) 2
- NUT Remove / Keep Under the nut (a) 2
- WASHER Remove / Keep Under the bolt head (a) 2
- WASHER Remove / Keep (a) 17
- BOLT Remove / Keep 2 (a) 17
- NUT Remove / Keep Under the nut (a) 17
- WASHER Remove / Keep Under the bolt head (a) 17
- WASHER Remove / Keep (a) 1
- UPPER CLIP Remove / Keep 3 (a) 1
- GUSSET Remove / Keep (a) 1
- FORMER Remove / Keep (a) 1
- SEAL Remove / Keep (a) 1
- LOWER CLIP Remove / Keep (b) 5
- BOLT Remove / Keep 4 (b) 5
- NUT Remove / Keep (b) 1
- BRACKET Remove / Keep 5 (b) 1
- LOWER BRACKET Remove / Keep **CAUTION:**ONLY REMOVE ONE PIN AT A TIME FOR EACH STABILIZER. IF YOU REMOVE MORETHAN ONE PIN AT A TIME FOR EACH STABILIZER, DAMAGE TO THE HORIZONTAL STABILIZER STRUCTURE OR SYSTEMS MAY OCCUR. (c) 1 180A1612-3 PIN- REAR SPAR UP- PER Remove 6 (d)

- BMS3-38 CORROSION INHIBIT- ING MATERIAL Apply 7 (e) 1 180A1612-7 PIN- REAR SPAR UP- PER Install (New) 8

**FIGURE 3: RIGHT HORIZONTAL STABILIZER - REAR SPAR ATTACH LOCATION - PIN REPLACEMENT (SHEET 3 OF 4)**  Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 09, 2012 737-55-1093 43 of 47 **BOEING SERVICE BULLETIN 737-55-1093 MORE DATA**  **QTY IDENTIFICATION**  **NAME TASK**  **STEP CAUTION:** ONLY REMOVE ONE PIN AT A TIME FOR EACH STABILIZER. IF YOU REMOVE MORETHAN ONE PIN AT A TIME FOR EACH STABILIZER, DAMAGE TO THE HORIZONTAL STABILIZER STRUCTURE OR SYSTEMS MAY OCCUR. (c) 1 180A1612-4 PIN- REAR SPAR Remove 9 (d)

- BMS3-38 CORROSION INHIBIT- ING MATERIAL Apply 10 (e) 1 180A1612-8 PIN- REAR SPAR Install (New) 11 **CAUTION:**ONLY REMOVE ONE PIN AT A TIME FOR EACH STABILIZER. IF YOU REMOVE MORETHAN ONE PIN AT A TIME FOR EACH STABILIZER, DAMAGE TO THE HORIZONTAL STABILIZER STRUCTURE OR SYSTEMS MAY OCCUR. (c) 1 180A1612-4 PIN- REAR SPAR Remove 12 (d)

- BMS3-38 CORROSION INHIBIT- ING MATERIAL Apply 13 (e) 1 180A1612-8 PIN- REAR SPAR Install (New) 14 (a) Removal of the Gusset Assembly is optional for access. The upper clip, gusset, former, seal and lower clip can be removed as an assembly. (b) Removal of the Aft Bracket Assembly is optional for access. The bracket and lower bracket can be removed as an assembly. (c) Remove the existing pin. Refer to 737-600/700/800/900 AMM 27-41-11 as an accepted procedure. (d) Clean the hole, refer to SOPM 20-30-03 as an accepted procedure. Apply corrosion inhibiting compound to the bolt and hole liberally, including the inner diameter of the bushing. (e) Install a new pin. Refer to 737-600/700/800/900 AMM 27-41-11 as an accepted procedure.

**FIGURE 3: RIGHT HORIZONTAL STABILIZER - REAR SPAR ATTACH LOCATION - PIN REPLACEMENT (SHEET 4 OF 4)**  Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 09, 2012 737-55-1093 44 of 47 **BOEING SERVICE BULLETIN 737-55-1093 FIGURE 4: RIGHT HORIZONTAL STABILIZER - REAR SPAR ATTACH LOCATION - BRACKET AND GUSSET**  **ASSEMBLY INSTALLATION (SHEET 1 OF 3)**  Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 09, 2012 737-55-1093 45 of 47 **BOEING SERVICE BULLETIN 737-55-1093 FIGURE 4: RIGHT HORIZONTAL STABILIZER - REAR SPAR ATTACH LOCATION - BRACKET AND GUSSET**  **ASSEMBLY INSTALLATION (SHEET 2 OF 3)**  Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 09, 2012 737-55-1093 46 of 47 **BOEING SERVICE BULLETIN 737-55-1093**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**  (a) 1
- UPPER CLIP Install (Kept) 1 (a) 1
- GUSSET Install (Kept) (a) 1
- FORMER Install (Kept) (a) 1
- SEAL Install (Kept) (a) 1
- LOWER CLIP Install (Kept) 17
- BOLT Install (Kept) 2 17
- NUT Install (Kept) Under the nut. 17
- WASHER Install (Kept) Under the bolt head. 17
- WASHER Install (Kept) 2
- BOLT Install (Kept) 3 2
- NUT Install (Kept) Under the nut. 2
- WASHER Install (Kept) Under the bolt head. 2
- WASHER Install (Kept) (b) 1
- BRACKET Install (Kept) 4 (b) 1
- LOWER BRACKET Install (Kept) 5
- BOLT Install (Kept) 5 5
- NUT Install (Kept) (a) Install the upper clip, gusset, former, seal and lower clip as an assembly. (b) Install the bracket and lower bracket as an assembly.

**FIGURE 4: RIGHT HORIZONTAL STABILIZER - REAR SPAR ATTACH LOCATION - BRACKET AND GUSSET ASSEMBLY INSTALLATION**  **(SHEET 3 OF 3)** Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 09, 2012 737-55-1093 47 of 47 **BOEING SERVICE BULLETIN 737-55-1093**