### Commercial **Airplanes** 

# 737

Service Bulletin **ALERT Number:**  **737-55A1097** Original Issue: July 01, 2015 ATA System: 5510 **SUBJECT:** STABILIZERS - Horizontal Stabilizer - Rear Spar Upper Chord Inspection 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 © 2015 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 Unpublished Work.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, Dreamliner, BBJ, DC-8, DC-9, DC-10, KC-10, KC-46, KDC-10, MD-10, MD-11, MD-80, MD-88, MD-90, P-8, 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.

Original Issue: July 01, 2015 737-55A1097 1of71 5.0Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: July 01, 2015 737-55A1097 2of71 **BOEING SERVICE BULLETIN 737-55A1097 ALERT**  **ALERT**

BLANK PAGE**Table of Contents**

Summary

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 1. PLANNING INFORMATION

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 A. Effectivity

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 1. Airplanes

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 2. Spares Affected

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 B. Concurrent Requirements

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 C. Reason

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 D. Description

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 E. Compliance

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 F. Approval

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 G. Manpower

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 H. Weight and Balance Changes

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 I. Electrical Load Data

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 J. References

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 1. Existing Data:

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 2. Data Supplied with this Service Bulletin:

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

. . . . . . . . . . . 42 K. Publications Affected

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 L. Interchangeability and Intermixability of Parts

. . . . . . . . . . . . . . . . . . . . . . . . . . . 42 M. Software Accomplishment Summary

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 2. MATERIAL INFORMATION

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 A. Material - Price and Availability

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 B. Industry Support Information

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 C. Parts Necessary for Each Airplane

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 1. Kits/Parts

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

. . . . . . . . . . . . . . . . . . . . . . . . 43 3. Parts Modified and Reidentified

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 4. Parts Removed and Not Replaced

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 D. Parts Necessary to Change Spares

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

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

. . . . . . . . . . . . . . . . . . . . . . . 43 3. ACCOMPLISHMENT INSTRUCTIONS

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 A. GENERAL INFORMATION

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 B. WORK INSTRUCTIONS

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 FIGURE 1: LEFT SIDE HORIZONTAL STABILIZER IDENTIFICATION PLATE INSPECTION

. . . . . 52 FIGURE 2: RIGHT SIDE HORIZONTAL STABILIZER IDENTIFICATION PLATE INSPECTION

. . . . 54 FIGURE 3: LEFT SIDE HORIZONTAL STABILIZER REAR SPAR UPPER CHORD - HFEC INSPECTION

TO DETECT ANY CRACK 0.100 INCH OR GREATER USING A 0.050 INCH SCAN INCREMENT

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56 FIGURE 4: RIGHT SIDE HORIZONTAL STABILIZER REAR SPAR UPPER CHORD - HFEC INSPECTION

TO DETECT ANY CRACK 0.100 INCH OR GREATER USING A 0.050 INCH SCAN INCREMENT

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58 FIGURE 5: LEFT SIDE HORIZONTAL STABILIZER REAR SPAR UPPER CHORD - HFEC INSPECTION

TO DETECT ANY CRACK 0.200 INCH OR GREATER USING A 0.100 INCH SCAN INCREMENT

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: July 01, 2015 737-55A1097 3of71 **BOEING SERVICE BULLETIN 737-55A1097 ALERT**  **ALERT**FIGURE 6: RIGHT SIDE HORIZONTAL STABILIZER REAR SPAR UPPER CHORD - HFEC INSPECTION TO DETECT ANY CRACK 0.200 INCH OR GREATER USING A 0.100 INCH SCAN INCREMENT

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62 APPENDIX A: LOGIC DIAGRAM FOR PARAGRAPH 1.E., COMPLIANCE: TABLE 1: HORIZONTAL

STABILIZER IDENTIFICATION

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64 APPENDIX B: LOGIC DIAGRAM FOR PARAGRAPH 1.E., COMPLIANCE: TABLE 2: HORIZONTAL

STABILIZER IDENTIFICATION

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: July 01, 2015 737-55A1097 4of71 **BOEING SERVICE BULLETIN 737-55A1097 ALERT**  **ALERT**

### Commercial **Airplanes** 

# 737

Service Bulletin **ALERT Summary**  **Number: 737-55A1097**  Original Issue: July 01, 2015 ATA System: 5510 **SUBJECT:** STABILIZERS - Horizontal Stabilizer - Rear Spar Upper Chord Inspection THIS BULLETIN IS SENT TO THE OPERATORS OF RECORD OF THE AIRPLANES SHOWN IN PARAGRAPH 1.A., EFFECTIVITY. IF AN AIRPLANE HAS BEEN LEASED OR SOLD, SEND THIS SERVICE BULLETIN TO THE NEW OPERATOR. IF APPLICABLE SPARES HAVE BEEN SOLD, SEND THIS SERVICE BULLETIN TO THE NEW OWNER. **CONCURRENT REQUIREMENTS** None. **BACKGROUND** This service bulletin gives instructions to inspect for cracking in the horizontal stabilizer rear spar upper chord on horizontal stabilizers with serial numbers SAIC0001-SAIC0143, SAIC0145-SAIC0625, SAIC0627-SAIC1144, SAIC1146-SAIC1601, and SAMC1602-SAMC2639. If the work in this service bulletin is not done, corrosion damage may lead to cracking in the horizontal stabilizer rear spar upper chord. Fracture of the upper chord of the horizontal stabilizer will compromise the structural integrity which could lead to departure of the horizontal stabilizer from the airplane. This will lead to loss of continued safe flight and landing. Due to a manufacturing oversight, supplier SAMC (Shanghai Aviation Manufacturing Corporation, formally SAIC, Shanghai Aviation Industrial Corporation) omitted the required protective finish (zinc-nickel alloy plate or cadmium plate) on the 182A1508-4/-5/-6 bushings (in line with the terminal fitting holes) installed in the rear spar upper chord on horizontal stabilizers with serial numbers SAIC0001-SAIC0143, SAIC0145-SAIC0625, SAIC0627-SAIC1144, SAIC1146-SAIC1601, and SAMC1602-SAMC2639. This issue was discovered after production of the affected stabilizers. The 182A1508-4/-5/-6 bushings are made from aluminum-nickel-bronze. When these bushings are installed into the 2024-T3511 aluminum horizontal stabilizer rear spar upper chord, this can lead to galvanic corrosion between the dissimilar metals. This corrosion can lead to cracking of the rear spar upper chord, which can result in the failure of the upper chord. Boeing Fleet Team Digest (FTD)737NG FTD 55-14001is related to this service bulletin. Boeing Service Related Problem (SRP)737NG-SRP-55-0056is related to this service bulletin. This table is provided to operators for planning purposes only. Refer to the applicable sections for more information.

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: July 01, 2015 737-55A1097 5of71**Reference Affected**  **Planning Data** Paragraph 1.A.2., Spares Affected Yes Spares Affected Paragraph 1.E., ComplianceandParagraph 1.F., Approval 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 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 No Kits/Parts Required Paragraph 2.C.2., Parts and Materials Supplied by the Operator No Operator Supplied Parts/Material Paragraph 2.F., Special Tooling Necessary to do this Service Bulletin No Special Tooling Required

**ACTION** To determine if the left and right horizontal stabilizers are affected, do one of the following: - OPTION 1: Do a check of delivery and maintenance records to find the serial number of the horizontal stabilizer installed on the airplane during production and to determine if the horizontal stabilizer has been exchanged. - OPTION 2: Gain access to the horizontal stabilizer identification plate and do an inspection of the identification plate to find the serial numbers of the horizontal stabilizers. If any affected horizontal stabilizer is installed on the airplane, do one of the following: - OPTION 1 (TO DETECT ANY CRACK 0.100 INCH OR GREATER): Do a High Frequency Eddy Current (HFEC) inspection of the horizontal stabilizer rear spar upper chord for any crack using a 0.050 inch scan increment. - OPTION 2 (TO DETECT ANY CRACK 0.200 INCH OR GREATER): Do an HFEC inspection of the horizontal stabilizer rear spar upper chord for any crack using a 0.100 inch scan increment. If no crack is found, repeat the OPTION 1 or OPTION 2 HFEC inspection at the repeat interval given inParagraph 1.E., Compliance

. If any crack is found, contact Boeing to get instructions for the repair for this service bulletin, and do the work instructed by Boeing. Repeat the inspection for any crack at the unrepaired areas. **EFFECTIVITY** 737-600, -700, -700C, -800, -900, -900ER Airplanes. Refer to Paragraph 1.A.1., Airplanes, for the list of affected airplanes. Refer to Paragraph 1.A.2., Spares Affected for the list of affected components.

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: July 01, 2015 737-55A1097 6of71 **BOEING SERVICE BULLETIN 737-55A1097 ALERT**  **ALERT 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. Refer toParagraph 1.E., Compliance

. **INDUSTRY SUPPORT INFORMATION** Boeing warranty remedies are available for 737 airplanes in warranty as of December 20, 2012. Refer to Paragraph 2.B., Industry Support Information. The warranty remedies will expire eight years from the original issue date of this service bulletin. **MANPOWER** Refer toParagraph 1.G., Manpower

. **MATERIAL INFORMATION** None.

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: July 01, 2015 737-55A1097 7of71 **BOEING SERVICE BULLETIN 737-55A1097 ALERT**  **ALERT**Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: July 01, 2015 737-55A1097 8of71 **BOEING SERVICE BULLETIN 737-55A1097 ALERT**  **ALERT**

### Commercial **Airplanes** 

# 737

Service Bulletin **ALERT Number:**  **737-55A1097** Original Issue: July 01, 2015 ATA System: 5510 **SUBJECT:** STABILIZERS - Horizontal Stabilizer - Rear Spar Upper Chord Inspection THIS BULLETIN IS SENT TO THE OPERATORS OF RECORD OF THE AIRPLANES SHOWN IN PARAGRAPH 1.A., EFFECTIVITY. IF AN AIRPLANE HAS BEEN LEASED OR SOLD, SEND THIS SERVICE BULLETIN TO THE NEW OPERATOR. IF APPLICABLE SPARES HAVE BEEN SOLD, SEND THIS SERVICE BULLETIN TO THE NEW OWNER. **1. PLANNING INFORMATION A.**  **Effectivity** 1. Airplanes This service bulletin is applicable to 737-600, -700, -700C, -800, -900, -900ER airplanes in 2 Groups. The Variable Numbers and Group Information for the applicable airplanes is given below. Refer toService Bulletin Index D6-19567Part 3 for Airplane Variable Number, Line Number, and Serial Number data. **NOTE:** The Variable Number table below includes all affected airplanes up to Line Number 6060. Affected airplanes after Line Number 6060 will be added to the service bulletin's MyBoeingFleet.com (MBF) "get effectivity" result when they are added to the MBF Fleet Profile Page.
**DESCRIPTION CONFIGURATION**  **GROUP** 737-600, -700, -700C, -800, -900, -900ER airplanes, line numbers 379-1117, 1119-1782, 1784-2504, 2506-4484. These airplanes were possibly delivered with affected stabilizers installed. - 1

737-600, -700, -700C, -800, -900, -900ER airplanes, line numbers 1-378, 1118, 1783, 2505, 4485 and on. These airplanes were not delivered with any affected stabilizer installed. - 2

Airplane Models: 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: July 01, 2015 737-55A1097 9of71**Group Variable Number**  2 YA001 - YA049 1 YA050 - YA099 1 YA101 - YA199 2 YA201 - YA206 1 YA207 - YA211 1 YA221 2 YA231 - YA242 2 YA251 - YA254 1 YA255 - YA256 2 YA271 - YA272 2 YA291 2 YA301 - YA302 2 YA311 - YA314 2 YA321 - YA322 1 YA323 1 YA336 - YA345 1 YA351 1 YA356 - YA357 1 YA366 - YA367 1 YA371 - YA377 2 YA501 - YA535 1 YA536 2 YA541 - YA546 1 YA547 - YA552 2 YA571 - YA577 1 YA578 2 YA601 - YA608 1 YA609 - YA615 1 YA621 - YA622 1 YA626 - YA631 1 YA635 - YA636 1 YA641 - YA642

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: July 01, 2015 737-55A1097 10of71 **BOEING SERVICE BULLETIN 737-55A1097 ALERT**  **ALERT Group**  **Variable Number** 1 YA645 - YA650 1 YA656 - YA659 1 YA666 - YA667 1 YA671 - YA672 1 YA681 - YA691 2 YA701 - YA704 1 YA705 - YA710 2 YA721 - YA722 2 YA731 1 YA732 - YA734 2 YA751 - YA756 1 YA801 - YA803 1 YA809 2 YA811 - YA814 2 YA831 - YA832 1 YA833 - YA835 2 YA841 - YA842 1 YA843 - YA862 2 YA881 1 YA882 1 YA891 - YA892 1 YA961 - YA978 1 YB001 - YB006 1 YB101 - YB112 2 YB113 1 YB114 - YB132 1 YB151 - YB153 1 YB156 - YB158 1 YB161 - YB164 1 YB171 - YB172 1 YB181 - YB184 1 YB201 - YB208 1 YB271

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: July 01, 2015 737-55A1097 11of71 **BOEING SERVICE BULLETIN 737-55A1097 ALERT**  **ALERT Group**  **Variable Number** 1 YB276 1 YB301 - YB310 1 YB371 - YB392 1 YB501 - YB502 1 YB521 - YB526 1 YB541 - YB544 1 YB551 1 YB561 - YB598 1 YB601 - YB636 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 - YB998 2 YC001 - YC011 1 YC012 - YC030 2 YC051 - YC058 1 YC059 - YC070 2 YC071 - YC076 1 YC077 - YC084 1 YC091 - YC095 2 YC101 - YC103 1 YC104 2 YC111 - YC112 1 YC113 2 YC121 2 YC126 - YC127

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: July 01, 2015 737-55A1097 12of71 **BOEING SERVICE BULLETIN 737-55A1097 ALERT**  **ALERT Group**  **Variable Number** 1 YC136 - YC141 1 YC146 - YC147 1 YC151 - YC156 1 YC166 - YC171 1 YC176 - YC179 1 YC186 - YC190 1 YC201 - YC203 1 YC206 - YC207 2 YC301 - YC302 1 YC303 - YC305 2 YC321 - YC348 1 YC349 - YC380 2 YC381 - YC382 1 YC383 - YC387 2 YC391 1 YC392 - YC394 1 YC396 2 YC401 - YC408 1 YC409 - YC417 1 YC421 - YC422 1 YC426 - YC428 1 YC436 - YC439 1 YC441 - YC448 1 YC451 - YC455 1 YC459 1 YC461 - YC467 2 YC471 - YC475 1 YC476 - YC499 2 YC501 - YC515 1 YC516 - YC526 2 YC571 - YC580 1 YC581 - YC583 1 YC587 - YC589

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: July 01, 2015 737-55A1097 13of71 **BOEING SERVICE BULLETIN 737-55A1097 ALERT**  **ALERT Group**  **Variable Number** 2 YC591 - YC593 2 YC601 - YC611 1 YC612 - YC655 1 YC681 - YC696 2 YC701 - YC706 1 YC707 - YC715 1 YC720 - YC725 1 YC727 - YC730 2 YC731 - YC734 1 YC735 - YC750 2 YC751 - YC752 2 YC761 - YC763 1 YC764 - YC770 2 YC781 - YC784 1 YC785 - YC793 2 YC801 - YC819 1 YC820 - YC892 1 YC901 - YC907 1 YC921 - YC922 2 YC931 - YC932 2 YC941 - YC942 1 YC943 - YC951 2 YC971 1 YC972 - YC978 1 YC981 - YC983 1 YD001 - YD007 1 YD021 - YD025 1 YD041 - YD057 1 YD081 - YD084 1 YD101 - YD117 1 YD121 - YD126 1 YD151 - YD159 1 YD171 - YD172

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: July 01, 2015 737-55A1097 14of71 **BOEING SERVICE BULLETIN 737-55A1097 ALERT**  **ALERT Group**  **Variable Number** 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 - YD419 2 YD420 - YD422 1 YD481 - YD485 1 YD491 - YD499 1 YD501 - YD512 1 YD531 - YD535 1 YD541 - YD547 1 YD561 - YD564 1 YD571 - YD572 1 YD591 - YD595 1 YD601 - YD612 1 YD651 - YD655 2 YE001 - YE017 1 YE018 - YE020 1 YE051 2 YE101 - YE109 2 YE151 - YE153 1 YE154 - YE157 1 YE171 - YE172 1 YE201 - YE206 1 YE301 - YE305 1 YE321 - YE326 1 YE371 - YE383 1 YF001 - YF011

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: July 01, 2015 737-55A1097 15of71 **BOEING SERVICE BULLETIN 737-55A1097 ALERT**  **ALERT Group**  **Variable Number** 1 YF021 - YF049 1 YF051 - YF072 2 YF073 - YF080 1 YF086 - YF087 1 YF106 - YF107 1 YF111 - YF114 1 YF116 - YF119 1 YF121 - YF132 1 YF176 - YF178 1 YF191 - YF192 1 YF201 - YF276 1 YF401 - YF402 1 YF431 - YF432 1 YF436 - YF437 1 YF441 - YF442 1 YF451 - YF460 1 YF501 - YF599 1 YF601 - YF661 2 YF662 - YF685 2 YF691 - YF695 1 YF701 - YF707 1 YF801 - YF805 1 YF831 - YF832 1 YF836 - YF838 1 YF871 - YF872 1 YF901 - YF905 1 YF921 - YF928 1 YF951 - YF954 2 YG001 - YG018 1 YG019 2 YG020 - YG023 1 YG024 - YG026 2 YG027 - YG032

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: July 01, 2015 737-55A1097 16of71 **BOEING SERVICE BULLETIN 737-55A1097 ALERT**  **ALERT Group**  **Variable Number** 1 YG033 - YG044 1 YG061 - YG064 1 YG066 - YG089 1 YG091 - YG099 1 YG101 - YG104 1 YG111 - YG114 1 YG116 - YG138 2 YG139 - YG146 1 YG201 - YG205 1 YG211 - YG214 1 YG221 - YG224 1 YG251 - YG252 1 YG501 - YG512 2 YG513 - YG515 1 YG601 - YG602 1 YG701 1 YG711 2 YG721 - YG722 1 YH001 - YH012 1 YH031 - YH055 1 YH071 - YH080 1 YH101 - YH132 1 YH201 - YH202 1 YH206 - YH207 1 YH301 - YH306 2 YH307 1 YH321 - YH322 1 YH501 - YH525 2 YH526 - YH530 1 YH531 - YH537 2 YH538 - YH542 1 YH551 - YH581 2 YH582 - YH594

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: July 01, 2015 737-55A1097 17of71 **BOEING SERVICE BULLETIN 737-55A1097 ALERT**  **ALERT Group**  **Variable Number** 1 YH601 - YH606 1 YH611 - YH620 1 YH631 - YH632 2 YH636 - YH637 1 YH641 2 YH681 - YH683 1 YH701 - YH708 2 YH709 - YH740 2 YH751 - YH755 2 YH801 - YH856 2 YH901 - YH908 2 YH911 - YH915 2 YH951 - YH952 1 YJ001 - YJ013 1 YJ021 1 YJ471 - YJ480 1 YJ501 - YJ517 1 YJ531 - YJ579 1 YJ591 - YJ599 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

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: July 01, 2015 737-55A1097 18of71 **BOEING SERVICE BULLETIN 737-55A1097 ALERT**  **ALERT Group**  **Variable Number** 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 1 YK471 - YK473 1 YK476 2 YK478 1 YK480 - YK487 1 YK491 - YK493 1 YK495 - YK499 1 YK511 - YK516 1 YK521 - YK530 1 YK551 - YK571 1 YK576 - YK577 1 YK580 - YK585 1 YK601 - YK602 1 YK606 - YK607 1 YK611 - YK616

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: July 01, 2015 737-55A1097 19of71 **BOEING SERVICE BULLETIN 737-55A1097 ALERT**  **ALERT Group**  **Variable Number** 1 YK621 - YK634 1 YK641 - YK644 1 YK651 - YK665 1 YK671 - YK672 1 YK676 - YK677 1 YK681 - YK686 1 YK691 1 YK695 - YK699 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 - YK929 1 YK941 - YK999 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 - YL137 1 YL201 - YL237 1 YL241 - YL242 1 YL271 - YL272

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: July 01, 2015 737-55A1097 20of71 **BOEING SERVICE BULLETIN 737-55A1097 ALERT**  **ALERT Group**  **Variable Number** 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 - YL551 1 YL561 - YL579 1 YL591 - YL598 1 YL601 - YL606 1 YL611 - YL612 1 YL616 - YL617 1 YL621 1 YL626 1 YL631 - YL634 1 YL636 - YL637 1 YL661 - YL664 1 YL676 - YL691 1 YL696 - YL697 1 YL701 - YL707 1 YL731 1 YL751 - YL752 1 YL756 - YL757 1 YL761 - YL780 1 YL796 - YL797 1 YL801 - YL815 1 YL901 - YL910

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: July 01, 2015 737-55A1097 21of71 **BOEING SERVICE BULLETIN 737-55A1097 ALERT**  **ALERT Group**  **Variable Number** 1 YL921 - YL940 1 YL951 - YL968 1 YM101 - YM103 1 YM201 - YM230 2 YM231 1 YM232 - YM244 1 YM251 - YM299 1 YM301 - YM399 1 YM401 - YM415 1 YM471 1 YM481 - YM484 1 YM501 - YM502 2 YM503 1 YM504 - 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 - YM699 1 YM701 - YM710 1 YM761 - YM765 1 YM771 - YM779 1 YN001 - YN016 1 YN021 - YN024 1 YN061 1 YN071 - YN082 1 YN091 - YN092 1 YN101 - YN112

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: July 01, 2015 737-55A1097 22of71 **BOEING SERVICE BULLETIN 737-55A1097 ALERT**  **ALERT Group**  **Variable Number** 1 YN121 1 YN126 1 YN201 - YN202 1 YN211 - YN219 1 YN231 - YN236 1 YN261 1 YN501 1 YN531 - YN534 1 YN551 - YN555 2 YN556 - YN566 2 YN581 - YN585 2 YN591 - YN592 1 YN601 - YN606 1 YN651 - YN652 2 YN653 1 YN701 - YN702 1 YN741 - YN743 2 YN744 - YN746 2 YN756 1 YQ001 - YQ003 1 YQ011 - YQ021 1 YQ026 - YQ029 1 YQ036 - YQ045 1 YQ201 - YQ203 2 YQ204 - YQ207 1 YQ231 1 YQ241 - YQ251 1 YQ281 - YQ284 1 YQ291 - YQ296 1 YQ301 - YQ302 1 YQ321 - YQ323 2 YQ324 1 YQ331 - YQ332

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: July 01, 2015 737-55A1097 23of71 **BOEING SERVICE BULLETIN 737-55A1097 ALERT**  **ALERT Group**  **Variable Number** 2 YQ333 - YQ334 1 YQ346 2 YQ347 2 YQ351 - YQ362 2 YQ371 1 YQ401 - YQ403 1 YQ451 - YQ454 1 YQ456 1 YQ461 1 YQ471 1 YQ501 - YQ505 2 YQ506 - YQ520 1 YR001 - YR023 2 YR024 - YR044 1 YR051 - YR069 2 YR070 - YR090 1 YR091 - YR096 2 YR097 - YR098 1 YR101 - YR104 2 YR105 1 YR111 - YR118 2 YR119 - YR124 1 YR126 - YR143 2 YR144 1 YR166 - YR182 1 YR186 - YR188 2 YR189 - YR198 1 YR201 - YR204 1 YR231 - YR266 2 YR267 - YR270 1 YR271 - YR289 2 YR290 1 YR291 - YR294

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: July 01, 2015 737-55A1097 24of71 **BOEING SERVICE BULLETIN 737-55A1097 ALERT**  **ALERT Group**  **Variable Number** 1 YR296 - YR297 1 YR301 - YR327 2 YR328 - YR334 2 YR338 - YR341 1 YR361 - YR366 1 YR371 - YR372 2 YR373 2 YR376 - YR377 1 YR381 - YR382 1 YR386 2 YR387 - YR388 2 YR391 1 YR396 - YR397 2 YR398 1 YR401 - YR405 1 YR411 - YR413 1 YR416 - YR417 2 YR418 1 YR421 - YR422 2 YR423 - YR424 1 YR426 2 YR427 - YR430 1 YR431 - YR436 2 YR437 - YR440 1 YR441 - YR446 2 YR447 - YR450 1 YR451 - YR455 1 YR457 - YR481 2 YR482 - YR499 1 YR501 - YR506 1 YR511 - YR520 1 YR526 - YR534 2 YR535

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: July 01, 2015 737-55A1097 25of71 **BOEING SERVICE BULLETIN 737-55A1097 ALERT**  **ALERT Group**  **Variable Number** 1 YR536 - YR541 2 YR542 - YR544 1 YR546 2 YR547 - YR551 2 YR556 - YR562 2 YR571 - YR582 2 YR591 - YR592 1 YR601 - YR605 1 YR616 - YR630 2 YR631 - YR650 1 YR651 - YR658 1 YR661 - YR663 2 YR671 - YR672 2 YR676 - YR678 2 YR681 - YR682 1 YR701 - YR759 2 YR760 - YR769 2 YR771 - YR799 1 YR801 - YR814 2 YR815 - YR820 1 YR831 - YR838 1 YR841 - YR845 2 YR846 - YR850 1 YR851 - YR866 2 YR867 - YR899 1 YR901 - YR903 1 YR931 - YR933 2 YR934 2 YR938 - YR940 1 YR941 - YR944 1 YR951 - YR960 2 YR961 - YR976 1 YR981 - YR991

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: July 01, 2015 737-55A1097 26of71 **BOEING SERVICE BULLETIN 737-55A1097 ALERT**  **ALERT Group**  **Variable Number** 2 YR992 - YR996 1 YS001 - YS002 2 YS006 - YS009 1 YS031 - YS032 1 YS051 - YS064 2 YS065 - YS073 1 YS101 - YS112 2 YS113 - YS120 2 YS126 - YS142 2 YS146 - YS148 1 YS151 - YS160 1 YS166 - YS173 2 YS174 - YS194 1 YS196 2 YS197 1 YS201 - YS207 2 YS208 - YS209 1 YS221 - YS225 2 YS231 - YS236 1 YS271 - YS273 2 YS274 - YS288 1 YS301 - YS316 2 YS317 - YS346 1 YS351 - YS352 2 YS353 - YS368 1 YS371 - YS374 2 YS375 - YS377 2 YS381 - YS383 2 YS401 1 YS451 2 YS456 - YS457 2 YS462 2 YS467

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: July 01, 2015 737-55A1097 27of71 **BOEING SERVICE BULLETIN 737-55A1097 ALERT**  **ALERT Group**  **Variable Number** 1 YS501 - YS502 2 YS506 2 YS511 - YS516 2 YS531 2 YS536 - YS538 2 YS541 1 YS551 - YS553 2 YS554 - YS556 1 YS561 - YS562 2 YS563 - YS578 2 YS581 - YS590 1 YS591 2 YS592 - YS595 1 YS601 - YS638 2 YS639 - YS685 1 YS686 - YS690 1 YS701 - YS705 2 YS706 - YS708 1 YS721 - YS727 2 YS728 - YS762 1 YS771 - YS775 2 YS776 - YS780 2 YS806 - YS810 2 YS816 - YS818 2 YS823 - YS825 2 YS851 - YS861 2 YS876 2 YS881 - YS883 2 YS901 - YS909 2 YS911 - YS939 2 YS951 2 YS956 - YS957 2 YS961 - YS965

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: July 01, 2015 737-55A1097 28of71 **BOEING SERVICE BULLETIN 737-55A1097 ALERT**  **ALERT Group**  **Variable Number** 2 YS981 - YS987 2 YS991 - YS998 1 YT001 2 YT002 - YT004 2 YT006 2 YT026 - YT027 2 YT031 - YT032 2 YT036 - YT038 2 YT061 - YT068 2 YT101 - YT117 2 YT126 - YT131 2 YT136 - YT138 2 YT176 - YT181 2 YT191 2 YT196 - YT199 2 YT201 2 YT206 - YT207 2 YT211 - YT213 2 YT251 - YT283 2 YT301 - YT307 2 YT311 - YT312 2 YT321 - YT341 2 YT381 2 YT391 - YT395 2 YT401 - YT403 2 YT411 - YT417 2 YT427 2 YT461 - YT474 2 YT491 - YT492 2 YT501 - YT520 2 YT551 - YT552 2 YT556 - YT559 2 YT561 - YT563

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: July 01, 2015 737-55A1097 29of71 **BOEING SERVICE BULLETIN 737-55A1097 ALERT**  **ALERT Group**  **Variable Number** 2 YT571 2 YT601 - YT606 2 YT701 - YT706 2 YT761 - YT780 2 YT791 - YT793 2 YT796 - YT797 2 YT801 - YT804 2 YT811 - YT813 2 YT826 - YT827 2 YT831 - YT832 2 YT851 - YT852 2 YT856 - YT859 2 YT891 - YT895 2 YT901 - YT925 2 YU001 - YU054 2 YU201 - YU212 2 YV001 - YV002 2 YV006 - YV008 2 YV041 - YV042 2 YV045 - YV047 2 YV081 2 YV083 2 YV097 2 YV101 - YV119 2 YV301 - YV305 2 YV351 - YV356 2 YV381 - YV382 2 YV431 - YV433 2 YV501 2 YV521 2 YV571 - YV574 2 YV601 - YV605 2 YV651 - YV654

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: July 01, 2015 737-55A1097 30of71 **BOEING SERVICE BULLETIN 737-55A1097 ALERT**  **ALERT Group**  **Variable Number** 2 YV711 2 YV741 2 YV781 2 YV801 2 YV881 - YV883 2 YW001 2 YW011 - YW032
2. Spares Affected Examine your spares supply for the parts or components identified below . If any parts or components are found, refer toParagraph 3.B., Work Instructionsfor the recommended action.
**Serial Number Part Name**  SAIC0001-SAIC0143, SAIC0145-SAIC0625, SAIC0627-SAIC1144, SAIC1146-SAIC1601, SAMC1602- SAMC2639 Horizontal Stabilizer

**B. Concurrent Requirements**  None. **C. Reason**  This service bulletin gives instructions to inspect for cracking in the horizontal stabilizer rear spar upper chord on horizontal stabilizers with serial numbers SAIC0001-SAIC0143, SAIC0145-SAIC0625, SAIC0627-SAIC1144, SAIC1146-SAIC1601, and SAMC1602-SAMC2639. If the work in this service bulletin is not done, corrosion damage may lead to cracking in the horizontal stabilizer rear spar upper chord. Fracture of the upper chord of the horizontal stabilizer will compromise the structural integrity which could lead to departure of the horizontal stabilizer from the airplane. This will lead to loss of continued safe flight and landing. Due to a manufacturing oversight, supplier SAMC (Shanghai Aviation Manufacturing Corporation, formally SAIC, Shanghai Aviation Industrial Corporation) omitted the required protective finish (zinc-nickel alloy plate or cadmium plate) on the 182A1508-4/-5/-6 bushings (in line with the terminal fitting holes) installed in the rear spar upper chord on horizontal stabilizers with serial numbers SAIC0001-SAIC0143, SAIC0145-SAIC0625, SAIC0627-SAIC1144, SAIC1146-SAIC1601, and SAMC1602-SAMC2639. This issue was discovered after production of the affected stabilizers. The 182A1508-4/-5/-6 bushings are made from aluminum-nickel-bronze. When these bushings are installed into the 2024-T3511 aluminum horizontal stabilizer rear spar upper chord, this can lead to galvanic corrosion between the dissimilar metals. This corrosion can lead to cracking of the rear spar upper chord, which can result in the failure of the upper chord. Boeing Fleet Team Digest (FTD)737NG FTD 55-14001is related to this service bulletin.

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: July 01, 2015 737-55A1097 31of71 **BOEING SERVICE BULLETIN 737-55A1097 ALERT**  **ALERT**Boeing Service Related Problem (SRP)737NG-SRP-55-0056is related to this service bulletin.

**D. Description**  To determine if the left and right horizontal stabilizers are affected, do one of the following: - OPTION 1: Do a check of delivery and maintenance records to find the serial number of the horizontal stabilizer installed on the airplane during production and to determine if the horizontal stabilizer has been exchanged. - OPTION 2: Gain access to the horizontal stabilizer identification plate and do an inspection of the identification plate to find the serial numbers of the horizontal stabilizers. If any affected horizontal stabilizer is installed on the airplane, do one of the following: - OPTION 1 (TO DETECT ANY CRACK 0.100 INCH OR GREATER): Do a High Frequency Eddy Current (HFEC) inspection of the horizontal stabilizer rear spar upper chord for any crack using a 0.050 inch scan increment. - OPTION 2 (TO DETECT ANY CRACK 0.200 INCH OR GREATER): Do an HFEC inspection of the horizontal stabilizer rear spar upper chord for any crack using a 0.100 inch scan increment. If no crack is found, repeat the OPTION 1 or OPTION 2 HFEC inspection at the repeat interval given inParagraph 1.E., Compliance

. If any crack is found, contact Boeing to get instructions for the repair for this service bulletin, and do the work instructed by Boeing. Repeat the inspection for any crack at the unrepaired areas. The work in this service bulletin is done in the maintenance zone(s) given below.
**Affected Maintenance Zones Zone**  **Model** 332, 342 737-600, 737-700, 737-700C, 737-800, 737-900, 737-900ER
**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. Do the required actions in accordance with Paragraph 3. Accomplishment Instructions. When more than one OPTION is given for a CONDITION, do only one of the OPTION numbers. When more than one ACTION is given for a CONDITION number or an OPTION number, do all of the ACTION numbers for that CONDITION number or OPTION number. Logic diagrams showing compliance tasks and compliance times are included as aids inAPPENDIX AandAPPENDIX B

.

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: July 01, 2015 737-55A1097 32of71 **BOEING SERVICE BULLETIN 737-55A1097 ALERT**  **ALERT Group 1:** 

**Table 1: Horizontal Stabilizer Identification Repeat Interval**  **(Not to Exceed) Compliance Time (Whichever**  **Occurs Later) Action**  **Condition**

- Within 12 months after the original issuedate of this service bulletin Before 20,000 total horizontal stabilizer flight cycles or within 10 years fromthe date of issuance of theoriginal certificate of airworthiness or the original export certificate of airworthiness, whichever occurs first OPTION 1: Do PART 1: RECORDS CHECK. All airplanes
OPTION 2: Do PART 2:HORIZONTAL STABILIZER IDENTIFICATION PLATE INSPECTION.(b)

- - - No more work is required. CONDITION 1: CURRENT-LY INSTALLED HORIZONTAL STABILIZER NOT AFFECTED(a)

- Within 12 months after the original issuedate of this service bulletin Before 20,000 total horizontal stabilizer flight cycles or within 10 years fromthe date of issuance of theoriginal certificate of airworthiness or the original export certificate of airworthiness, whichever occurs first OPTION 1 (TO DETECT ANY CRACK 0.100 INCH OR GREATER): Do an HFEC inspection of the horizontal stabilizer rear spar upper chord for any crack.(c)CONDITION 2: CURRENTLY INSTALLED HORIZONTAL STABILIZER AFFECTED(a)

OPTION 2 (TO DETECT ANY CRACK 0.200 INCH OR GREATER): Do an HFEC inspection of the horizontal stabilizer rear spar upper chord for any crack.(c)

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: July 01, 2015 737-55A1097 33of71 **BOEING SERVICE BULLETIN 737-55A1097 ALERT**  **ALERT Group 1:** 

**Table 1: Horizontal Stabilizer Identification Repeat Interval**  **(Not to Exceed) Compliance Time (Whichever**  **Occurs Later) Action**  **Condition**

- Within 12 months after the original issuedate of this service bulletin Before 20,000 total horizontal stabilizer flight cycles or within 10 years fromthe date of issuance of theoriginal certificate of airworthiness or the original export certificate of airworthiness, whichever occurs firstDo PART 2: HORIZONTAL STABILIZER IDENTIFICATION PLATE INSPECTION.(b)CONDITION 3: PRODUCTION HORIZONTAL STABILIZER NOT EXCHANGED AND SERIAL NUMBER UNKNOWN

- Within 12 months after the original issuedate of this service bulletin Before 20,000 total horizontal stabilizer flight cycles or within 10 years fromthe date of issuance of theoriginal certificate of airworthiness or the original export certificate of airworthiness, whichever occurs firstOPTION 1: Check maintenance records to find the original delivered airplanefor the horizontal stabilizer.CONDITION 4: ANY HORIZONTAL STABILIZEREXCHANGED AND INSTALLED HORIZONTAL STABILIZER SERIAL NUMBER UNKNOWN OPTION 2: Do PART 2:HORIZONTAL STABILIZER IDENTIFICATION PLATE INSPECTION.(b)

- - - No more work is required. CONDITION 8: HORIZON- TAL STABILIZER IS FROM AIRPLANE LINE NUMBER 1-378, 1118, 1783, 2505, OR 4485-5388

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: July 01, 2015 737-55A1097 34of71 **BOEING SERVICE BULLETIN 737-55A1097 ALERT**  **ALERT Group 1:** 

**Table 1: Horizontal Stabilizer Identification Repeat Interval**  **(Not to Exceed) Compliance Time (Whichever**  **Occurs Later) Action**  **Condition**

- Within 12 months after the original issuedate of this service bulletin Before 20,000 total horizontal stabilizer flight cycles or within 10 years fromthe date of issuance of theoriginal certificate of airworthiness or the original export certificate of airworthiness, whichever occurs firstDo PART 2: HORIZONTAL STABILIZER IDENTIFICATION PLATE INSPECTION.(b)CONDITION 9: HORIZONTAL STABILIZER IS FROM AIRPLANE LINE NUMBER 379-1117, 1119- 1782, 1784-2504, OR 2506-4484 OR IS FROM UNKNOWN AIRPLANE

(a) Affected horizontal stabilizer serial numbers are SAIC0001-SAIC0143, SAIC0145-SAIC0625, SAIC0627- SAIC1144, SAIC1146-SAIC1601, and SAMC1602-SAMC2639. (b) Refer to Table 3 for resulting conditions and corrective actions. (c) Refer to Table 4 for resulting conditions and corrective actions. **Group 2: Table 2: Horizontal Stabilizer Identification**  **Repeat Interval (Not to Exceed)**  **Compliance Time (Whichever Occurs Later)**  **Action Condition** 

- Within 12 months after the original issuedate of this service bulletin Before 20,000 total horizontal stabilizer flight cycles or within 10 years fromthe date of issuance of theoriginal certificate of airworthiness or the original export certificate of airworthiness, whichever occurs first OPTION 1: Do PART 1: RECORDS CHECK. All airplanes
OPTION 2: Do PART 2:HORIZONTAL STABILIZER IDENTIFICATION PLATE INSPECTION.(b)

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: July 01, 2015 737-55A1097 35of71 **BOEING SERVICE BULLETIN 737-55A1097 ALERT**  **ALERT Group 2:** 

**Table 2: Horizontal Stabilizer Identification Repeat Interval**  **(Not to Exceed) Compliance Time (Whichever**  **Occurs Later) Action**  **Condition**

- - - No more work is required. CONDITION 5: NO HORI-ZONTAL STABILIZER EXCHANGED OR ANY HORIZONTAL STABILIZER EXCHANGED WITH ANUNAFFECTED HORIZONTAL STABILIZER(a)

- Within 12 months after the original issuedate of this service bulletin Before 20,000 total horizontal stabilizer flight cycles or within 10 years fromthe date of issuance of theoriginal certificate of airworthiness or the original export certificate of airworthiness, whichever occurs first OPTION 1 (TO DETECT ANY CRACK 0.100 INCH OR GREATER): Do an HFEC inspection of the horizontal stabilizer rear spar upper chord for any crack.(c)CONDITION 6: ANY HORIZONTAL STABILIZEREXCHANGED AND AFFECTED HORIZONTAL STABILIZER INSTALLED (a) OPTION 2 (TO DETECT ANY CRACK 0.200 INCH OR GREATER): Do an HFEC inspection of the horizontal stabilizer rear spar upper chord for any crack.(c)

- Within 12 months after the original issuedate of this service bulletin Before 20,000 total horizontal stabilizer flight cycles or within 10 years fromthe date of issuance of theoriginal certificate of airworthiness or the original export certificate of airworthiness, whichever occurs firstOPTION 1: Check maintenance records to find the original delivered airplanefor the horizontal stabilizer.CONDITION 7: ANY HORIZONTAL STABILIZEREXCHANGED AND INSTALLED HORIZONTAL STABILIZER SERIAL NUMBER UNKNOWN OPTION 2: Do PART 2:HORIZONTAL STABILIZER IDENTIFICATION PLATE INSPECTION.(b)

- - - No more work is required. CONDITION 8: HORIZON- TAL STABILIZER IS FROM AIRPLANE LINE NUMBER 1-378, 1118, 1783, 2505, OR 4485-5388

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: July 01, 2015 737-55A1097 36of71 **BOEING SERVICE BULLETIN 737-55A1097 ALERT**  **ALERT Group 2:** 

**Table 2: Horizontal Stabilizer Identification Repeat Interval**  **(Not to Exceed) Compliance Time (Whichever**  **Occurs Later) Action**  **Condition**

- Within 12 months after the original issuedate of this service bulletin Before 20,000 total horizontal stabilizer flight cycles or within 10 years fromthe date of issuance of theoriginal certificate of airworthiness or the original export certificate of airworthiness, whichever occurs firstDo PART 2: HORIZONTAL STABILIZER IDENTIFICATION PLATE INSPECTION.(b)CONDITION 9: HORIZONTAL STABILIZER IS FROM AIRPLANE LINE NUMBER 379-1117, 1119- 1782, 1784-2504, OR 2506-4484 OR IS FROM UNKNOWN AIRPLANE

(a) Affected horizontal stabilizer serial numbers are SAIC0001-SAIC0143, SAIC0145-SAIC0625, SAIC0627- SAIC1144, SAIC1146-SAIC1601, and SAMC1602-SAMC2639. (b) Refer to Table 3 for resulting conditions and corrective actions. (c) Refer to Table 4 for resulting conditions and corrective actions.

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: July 01, 2015 737-55A1097 37of71 **BOEING SERVICE BULLETIN 737-55A1097 ALERT**  **ALERT Table 3: PART 2: HORIZONTAL STABILIZER IDENTIFICATION PLATE INSPECTION - Corrective Actions**  **Repeat Interval (Not to Exceed)**  **Compliance Time (Whichever Occurs Later)**  **Action Condition** 

- - - No more work is required. CONDITION 10: NO AF-FECTED SERIAL NUMBER FOUND(a)

- Within 12 months after the original issuedate of this service bulletin Before 20,000 total horizontal stabilizer flight cycles or within 10 years fromthe date of issuance of theoriginal certificate of airworthiness or the original export certificate of airworthiness, whichever occurs first OPTION 1 (TO DETECT ANY CRACK 0.100 INCH OR GREATER): Do an HFEC inspection of the horizontal stabilizer rear spar upper chord for any crack.(b)CONDITION 11: ANY AFFECTED SERIAL NUMBER FOUND(a)

OPTION 2 (TO DETECT ANY CRACK 0.200 INCH OR GREATER): Do an HFEC inspection of the horizontal stabilizer rear spar upper chord for any crack.(b) (a) Affected horizontal stabilizer serial numbers are SAIC0001-SAIC0143, SAIC0145-SAIC0625, SAIC0627- SAIC1144, SAIC1146-SAIC1601, and SAMC1602-SAMC2639. (b) See Table 4 for resulting conditions and corrective actions.

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: July 01, 2015 737-55A1097 38of71 **BOEING SERVICE BULLETIN 737-55A1097 ALERT**  **ALERT Table 4: Horizontal Stabilizer Rear Spar Upper Chord HFEC Inspection - Corrective Actions**  **Repeat Interval (Not to Exceed)**  **Compliance Time Action**  **Condition**

- - Do one of the following: CONDITION 12: NO CRACK FOUND 3,000 horizontalstabilizer flight cycles - Repeat OPTION 1 (TO DETECT ANY CRACK 0.100 INCH ORGREATER) HFEC inspection of the horizontal stabilizer rear spar upper chord. 2,000 horizontalstabilizer flight cycles - Repeat OPTION 2 (TO DETECT ANY CRACK 0.200 INCH ORGREATER) HFEC inspection of the horizontal stabilizer rear spar upper chord.

- Before further flight ACTION 1: Contact Boe- ing to get instructions for the repair for this service bulletin, and do the work instructed by Boeing. CONDITION 13: ANY CRACK FOUND

- - ACTION 2: Do one of the following: 3,000 horizontalstabilizer flight cycles - Repeat OPTION 1 (TO DETECT ANY CRACK 0.100 INCH ORGREATER) HFEC inspection of the horizontal stabilizer rear spar upper chord, for any crack of the unrepaired area. 2,000 horizontalstabilizer flight cycles - Repeat OPTION 2 (TO DETECT ANY CRACK 0.200 INCH ORGREATER) HFEC inspection of the horizontal stabilizer rear spar upper chord, for any crack of the unrepaired area.
**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

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: July 01, 2015 737-55A1097 39of71 **BOEING SERVICE BULLETIN 737-55A1097 ALERT**  **ALERT**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. This service bulletin is also approved for airplanes having FAA Aviation Partners Boeing (APB) Supplemental Type Certificate (STC) number ST00830SE installed (not including any areas affected by the split scimitar winglet configuration). 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 Seattle ACO approves the incorporation of the inspection threshold, interval, and methods as given in Table 4, underParagraph 1.E., Compliancein this service bulletin, as an Alternative Method of Compliance (AMOC) to the incorporation of the corresponding HFEC inspections in the area of Principal Structural Elements 55-10-04-10A, 55-10-04-10B, and 55-10-04-10C, specified in Subsection B of Section 9 of Boeing Model 737-600/700/700C/800/900/900ER MPD, Document D626A001-CMR, Revision July 2011, December 2011, or August 2012, required by paragraphs (g) and (h) ofAD 2013-19-23. All provisions ofAD 2013-19-23that are not specifically referenced in the preceding sentence remain fully applicable and must be complied with accordingly. **G. Manpower**  The tables below show an estimate of the task hours necessary to do this inspection for each airplane or component. 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. 1. Airplane-Level Work

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: July 01, 2015 737-55A1097 40of71 **BOEING SERVICE BULLETIN 737-55A1097 ALERT**  **ALERT HORIZONTAL STABILIZER - REAR SPAR UPPER CHORD - INSPECTION**  **Elapsed Hours Task Hours**  **Number of Persons Task**  1.50 1.50 1 Preparation and Open Access 0.05 0.05 1 FIGURE 1 0.05 0.05 1 FIGURE 2 1.00 1.00 1 FIGURE 3 or FIG- URE 5 1.00 1.00 1 FIGURE 4 or FIG- URE 6 1.50 1.50 1 Restoration and Close Access 5.10 5.10 TOTAL FOR EACH AIRPLANE
2. Component-Level Work **HORIZONTAL STABILIZER - REAR SPAR UPPER CHORD - INSPECTION Elapsed Hours**  **Task Hours Number of Persons**  **Task** 0.05 0.05 1 FIGURE 1 0.05 0.05 1 FIGURE 2 1.00 1.00 1 FIGURE 3 or FIG- URE 5 1.00 1.00 1 FIGURE 4 or FIG- URE 6 2.10 2.10 TOTAL FOR LEFT SIDE OF AIRPLANE
**H. Weight and Balance Changes**  None. **I. Electrical Load Data**  Not changed. **J. References**  1. Existing Data:

a. Boeing Service Related Problem (SRP)737NG-SRP-55-0056 b. Federal Aviation Administration (FAA) Airworthiness Directive (AD)2013-19-23

c. Service Bulletin IndexD6-19567

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: July 01, 2015 737-55A1097 41of71 **BOEING SERVICE BULLETIN 737-55A1097 ALERT**  **ALERT**d. Standard Overhaul Practices Manual (SOPM)20-50-01

e. 737 Non-Destructive Testing (NDT) ManualPart 6, 55-10-27 f. 737-600/700/800/900 Aircraft Maintenance Manual (AMM)06-42-00,27-31-00,27-41-11 g. 737NG Fleet Team Digest (FTD)55-14001 2. Data Supplied with this Service Bulletin: None. 3. Installation Drawings Used in the Preparation of this Service Bulletin: None. **K. Publications Affected**  1. Publications: **Chapter-Section Publication**  55-10-27 737 NDT Manual Part 6
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. DTI requirements for the structure affected are contained in Paragraph 1.E., Compliance of this service bulletin. **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: July 01, 2015 737-55A1097 42of71 **BOEING SERVICE BULLETIN 737-55A1097 ALERT**  **ALERT 2. MATERIAL INFORMATION**  **A. Material - Price and Availability**  None. **B. Industry Support Information**  Boeing warranty remedies are available for 737 airplanes in warranty as of December 20, 2012. For inspection labor task hour reimbursement for airplanes in warranty as of that date, send a warranty claim to Boeing Fleet Support Contracts - Warranty. If the condition described in this service bulletin is found during the inspection for airplanes in warranty as of that date and additional task hours, parts, and/or special tools are required, send a warranty claim to Boeing Fleet Support Contracts - Warranty. Please refer to this service bulletin number and reference the airplane variable number(s) in your purchase order. The warranty remedies will expire eight years from the original issue date of this service bulletin. **C. Parts Necessary for Each Airplane**  1. Kits/Parts None. 2. Parts and Materials Supplied by the Operator None. 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 inParagraph 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: July 01, 2015 737-55A1097 43of71 **BOEING SERVICE BULLETIN 737-55A1097 ALERT**  **ALERT**Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: July 01, 2015 737-55A1097 44of71 **BOEING SERVICE BULLETIN 737-55A1097 ALERT**  **ALERT**

BLANK PAGE**3. ACCOMPLISHMENT INSTRUCTIONS A.**  **GENERAL INFORMATION CAUTION:**  KEEP THE WORK AREA, WIRES AND ELECTRICAL BUNDLES CLEAN OF METAL

PARTICLES OR CONTAMINATION WHEN YOU USE TOOLS. UNWANTED MATERIAL, METAL PARTICLES OR CONTAMINATION CAUGHT IN WIRE BUNDLES CAN CAUSE DAMAGE TO THE BUNDLES. DAMAGED WIRE BUNDLES CAN CAUSE SPARKS OR OTHER ELECTRICAL DAMAGE. **NOTE:** 1. Manual titles are referred to by acronyms. Refer toParagraph 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:

– 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 and fasteners are in Structural Repair Manual (SRM) Chapter 51

– Torque Values:

— Values for structural fasteners are given in 737 Structural Repair Manual, Chapter 51.

— Values for airframe maintenance tasks are included in Chapter 20 of 737 Aircraft Maintenance Manual (AMM).

— Values for electrical maintenance tasks are included in Chapter 20 of Standard Wiring Practices Manual (SWPM).

— Values for engine maintenance tasks are included in Chapter 70 of 737 Aircraft Maintenance Manual (AMM).

— Non-standard torque values for maintenance tasks are included in the applicable installation step.

4. Use the approved fastener, process and material substitutions in accordance with

SRM Chapter 51. 5. If the length of any fastener specified in this service bulletin does not meet 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. In addition, washers may be installed for fastener grip length in accordance with SRM Chapter 51. Refer toSOPM 20-50-01for alternate full threaded fasteners (screws) needed for installation in this service bulletin. 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.

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: July 01, 2015 737-55A1097 45of71 **BOEING SERVICE BULLETIN 737-55A1097 ALERT**  **ALERT**7. Refer toAPPENDIX AandAPPENDIX Bfor logic diagram(s). Logic diagrams are provided as an aid only. Information contained in Paragraph 1.E., Compliance is the primary source for compliance times. Information in Paragraph 3.B., Work Instructions is the primary source for tasks required for compliance. 8. The instructions in Paragraph 3.B., Work Instructions and the figures can include operation of tools or test equipment. Boeing Engineering Tool Drawings, the Illustrated Tool and Equipment Manual, and the Special Tool and Ground Handling Drawing Index contain data on versions of the tools or test equipment that you can use. It is permitted to use replaced tools. It is not permitted to use superseded tools. 9. 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 remove all of the identified parts. Jacking and shoring limitations must be observed. 10. 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. 11. This service bulletin includes functional test procedures for the systems changed by this service bulletin. More functional tests can possibly be necessary in accordance with standard maintenance practices because of interruption to other airplane systems. 12. If shading is used, shaded areas in Figures are to separate the non-critical and non-authoritative information from the critical and authoritative information. 13. Use of colors in Figures is based on guidance from the ATA e-Business Program (ATA) iSpec 2200. 14. When more than one OPTION is given for a CONDITION, do only one of the OPTION numbers. When more than one ACTION is given for a CONDITION number or an OPTION number, do all of the ACTION numbers for that CONDITION number or OPTION number. 15. The compliance times for the actions in Paragraph 3.B., WORK INSTRUCTIONS are inParagraph 1.E., Compliance

. 16. Some steps in the Work Instructions are labeled as Required for Compliance (RC). If this service bulletin is mandated by an Airworthiness Directive (AD), then the steps labeled as RC, including sub-steps under an RC step and any figures identified in an RC step, must be done to comply with the AD. An Alternative Method of Compliance (AMOC) is required for any deviations to RC steps, including sub-steps and identified figures. Steps not labeled as RC may be deviated from using accepted methods in accordance with the operator's maintenance or inspection program without obtaining approval of an AMOC. 17. A check of the airplane maintenance and delivery records is an acceptable method to determine if the left and right horizontal stabilizers are affected provided the installed components can be conclusively determined from that check. **B. WORK INSTRUCTIONS**  1. RC - To determine if the left and right horizontal stabilizers are affected, do one of the following options:

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: July 01, 2015 737-55A1097 46of71 **BOEING SERVICE BULLETIN 737-55A1097 ALERT**  **ALERT**a. OPTION 1 : Do PART 1: RECORDS CHECK. b. OPTION 2: Do PART 2: HORIZONTAL STABILIZER IDENTIFICATION PLATE INSPECTION. **PART 1: RECORDS CHECK** 1. **Group 1:** RC - Do a check of delivery and maintenance records to find the serial numbers of the horizontal stabilizers installed on the airplane during production and to determine if any horizontal stabilizer has been exchanged. Affected horizontal stabilizer serial numbers are SAIC0001-SAIC0143, SAIC0145-SAIC0625, SAIC0627-SAIC1144, SAIC1146-SAIC1601, and SAMC1602-SAMC2639.

a. CONDITION 1: CURRENTLY INSTALLED HORIZONTAL STABILIZER NOT AFFECTED (1) No more work is required. b. CONDITION 2: CURRENTLY INSTALLED HORIZONTAL STABILIZER AFFECTED (1) Do PART 4: HORIZONTAL STABILIZER REAR SPAR UPPER CHORD - HFEC INSPECTION.

c. CONDITION 3: PRODUCTION HORIZONTAL STABILIZER NOT EXCHANGED AND SERIAL NUMBER UNKNOWN (1) Do PART 2: HORIZONTAL STABILIZER IDENTIFICATION PLATE INSPECTION. d. CONDITION 4: ANY HORIZONTAL STABILIZER EXCHANGED AND INSTALLED HORIZONTAL STABILIZER SERIAL NUMBER UNKNOWN (1) OPTION 1: Check maintenance records to find the original delivered airplane for the horizontal stabilizer. (a) CONDITION 8: HORIZONTAL STABILIZER IS FROM AIRPLANE LINE NUMBER 1-378, 1118, 1783, 2505, OR 4485-5388 1) No more work is required. (b) CONDITION 9: HORIZONTAL STABILIZER IS FROM AIRPLANE LINE NUMBER 379-1117, 1119-1782, 1784-2504, OR 2506-4484 OR IS FROM UNKNOWN AIRPLANE 1) Do PART 2: HORIZONTAL STABILIZER IDENTIFICATION PLATE INSPECTION. (2) OPTION 2: Do PART 2: HORIZONTAL STABILIZER IDENTIFICATION PLATE INSPECTION. 2. **Group 2:** RC - Do a check of maintenance records to determine if any horizontal stabilizer has been exchanged.

a. CONDITION 5: NO HORIZONTAL STABILIZER EXCHANGED OR ANY HORIZONTAL STABILIZER EXCHANGED WITH AN UNAFFECTED HORIZONTAL STABILIZER

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: July 01, 2015 737-55A1097 47of71 **BOEING SERVICE BULLETIN 737-55A1097 ALERT**  **ALERT**(1) No more work is required. b. CONDITION 6: ANY HORIZONTAL STABILIZER EXCHANGED AND AFFECTED HORIZONTAL STABILIZER INSTALLED (1) Do PART 4: HORIZONTAL STABILIZER REAR SPAR UPPER CHORD - HFEC INSPECTION.

c. CONDITION 7: ANY HORIZONTAL STABILIZER EXCHANGED AND INSTALLED HORIZONTAL STABILIZER SERIAL NUMBER UNKNOWN (1) OPTION 1: Check maintenance records to find the original delivered airplane for the installed horizontal stabilizer. (a) CONDITION 8: HORIZONTAL STABILIZER IS FROM AIRPLANE LINE NUMBER 1-378, 1118, 1783, 2505, OR 4485-5388 1) No more work is required. (b) CONDITION 9: HORIZONTAL STABILIZER IS FROM AIRPLANE LINE NUMBER 379-1117, 1119-1782, 1784-2504, OR 2506-4484 OR IS FROM UNKNOWN AIRPLANE 1) Do PART 2: HORIZONTAL STABILIZER IDENTIFICATION PLATE INSPECTION. (2) OPTION 2: Do PART 2: HORIZONTAL STABILIZER IDENTIFICATION PLATE INSPECTION. **PART 2: HORIZONTAL STABILIZER IDENTIFICATION PLATE INSPECTION** 1. Do PART 3: PREPARATION AND ACCESS - AIRPLANE-LEVEL WORK ONLY. 2. RC - Inspect the horizontal stabilizer identification plates in accordance withFIGURE 1andFIGURE 2

.
a. CONDITION 10: NO AFFECTED SERIAL NUMBER FOUND (1) No more work is required. b. CONDITION 11: ANY AFFECTED SERIAL NUMBER FOUND (1) Do PART 4: HORIZONTAL STABILIZER REAR SPAR UPPER CHORD - HFEC INSPECTION. 3. Do PART 5: RESTORATION - AIRPLANE-LEVEL WORK ONLY. **PART 3: PREPARATION AND ACCESS - AIRPLANE-LEVEL WORK ONLY** 1. Remove pressure from elevator hydraulic systems A and B. Refer to737-600/700/800/900 AMM 27-31-00as an accepted procedure. 2. Set the stabilizer trim cutout switches (located on the control stand) to the cutout position.

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: July 01, 2015 737-55A1097 48of71 **BOEING SERVICE BULLETIN 737-55A1097 ALERT**  **ALERT**3. Open the following circuit breakers and attach DO-NOT-CLOSE tags:

a. Circuit Breaker Panel P6-2: (1) 6B10 FLIGHT CONTROL STAB TRIM CONT. (2) 6D10 FLIGHT CONTROL STAB TRIM ACTUATOR. b. Circuit Breaker Panel P18-1: (1) 18C2 AFCS STABILIZER TRIM.

c. Circuit Breaker Panel P18-2: (1) 18C8 FLIGHT RECORDER POSITION SENSOR. d. Circuit Breaker Panel P18-3: (1) 18A15 EXTERIOR LIGHTING LOGO ILLUM (If installed). 4. Use the stabilizer trim wheel on the control stand and set the horizontal stabilizer at zero degrees (4 units of trim). 5. Install the lock F71336-501 to the stabilizer trim wheel at the control stand. Refer to 737-600/700/800/900 AMM 27-41-11as an accepted procedure. 6. Remove and keep gap covers 332AB and 342AB or 332AT and 342AT from the horizontal stabilizer. Refer to737-600/700/800/900 AMM 06-42-00

. **PART 4: HORIZONTAL STABILIZER REAR SPAR UPPER CHORD - HFEC INSPECTION** 1. Do one of the following options:

a. RC - OPTION 1 (TO DETECT ANY CRACK 0.100 INCH OR GREATER): Do a High Frequency Eddy Current (HFEC) inspection of the horizontal stabilizer rear spar upper chord for any crack in accordance withFIGURE 3andFIGURE 4

. (1) CONDITION 12: NO CRACK FOUND (a) Do one of the following: 1) Repeat OPTION 1 (TO DETECT ANY CRACK 0.100 INCH OR GREATER) HFEC inspection of the horizontal stabilizer rear spar upper chord for any crack at the repeat interval given inParagraph 1.E., Compliance

. 2) Repeat OPTION 2 (TO DETECT ANY CRACK 0.200 INCH OR GREATER) HFEC inspection of the horizontal stabilizer rear spar upper chord for any crack at the repeat interval given inParagraph 1.E., Compliance

. (2) CONDITION 13: ANY CRACK FOUND (a) Contact Boeing to get instructions for the repair for this service bulletin, and do the work instructed by Boeing.

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: July 01, 2015 737-55A1097 49of71 **BOEING SERVICE BULLETIN 737-55A1097 ALERT**  **ALERT**(b) Do one of the following: 1) Repeat OPTION 1 (TO DETECT ANY CRACK 0.100 INCH OR GREATER) HFEC inspection of the horizontal stabilizer rear spar upper chord for any crack at the unrepaired area at the repeat interval given inParagraph 1.E., Compliance

. 2) Repeat OPTION 2 (TO DETECT ANY CRACK 0.200 INCH OR GREATER) HFEC inspection of the horizontal stabilizer rear spar upper chord for any crack at the unrepaired area at the repeat interval given inParagraph 1.E., Compliance

. b. RC - OPTION 2 (TO DETECT ANY CRACK 0.200 INCH OR GREATER): Do an HFEC inspection of the horizontal stabilizer rear spar upper chord for any crack in accordance with FIGURE 5andFIGURE 6

. (1) CONDITION 12: NO CRACK FOUND (a) Do one of the following: 1) Repeat OPTION 1 (TO DETECT ANY CRACK 0.100 INCH OR GREATER) HFEC inspection of the horizontal stabilizer rear spar upper chord for any crack at the repeat interval given inParagraph 1.E., Compliance

. 2) Repeat OPTION 2 (TO DETECT ANY CRACK 0.200 INCH OR GREATER) HFEC inspection of the horizontal stabilizer rear spar upper chord for any crack at the repeat interval given inParagraph 1.E., Compliance

. (2) CONDITION 13: ANY CRACK FOUND (a) Contact Boeing to get instructions for the repair for this service bulletin, and do the work instructed by Boeing. (b) Do one of the following: 1) Repeat OPTION 1 (TO DETECT ANY CRACK 0.100 INCH OR GREATER) HFEC inspection of the horizontal stabilizer rear spar upper chord for any crack at the unrepaired area at the repeat interval given inParagraph 1.E., Compliance

. 2) Repeat OPTION 2 (TO DETECT ANY CRACK 0.200 INCH OR GREATER) HFEC inspection of the horizontal stabilizer rear spar upper chord for any crack at the unrepaired area at the repeat interval given inParagraph 1.E., Compliance

. **PART 5: RESTORATION - AIRPLANE-LEVEL WORK ONLY** 1. Install the kept gap covers 332AB and 342AB or 332AT and 342AT on the horizontal stabilizer. Refer to737-600/700/800/900 AMM 06-42-00

. 2. Remove the lock F71336-501 from the stabilizer trim wheel at the control stand. Refer to 737-600/700/800/900 AMM 27-41-11as an accepted procedure. 3. Close the circuit breakers that were opened above and remove the DO-NOT-CLOSE tags. 4. Reset the stabilizer trim cutout switches.

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: July 01, 2015 737-55A1097 50of71 **BOEING SERVICE BULLETIN 737-55A1097 ALERT**  **ALERT**5. Restore pressure to elevator hydraulic systems A and B. Refer to737-600/700/800/900 AMM 27-31-00as an accepted procedure. 6. Put the airplane back to a serviceable condition.

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: July 01, 2015 737-55A1097 51of71 **BOEING SERVICE BULLETIN 737-55A1097 ALERT**  **ALERT FIGURE 1:** **LEFT SIDE HORIZONTAL STABILIZER IDENTIFICATION PLATE INSPECTION (SHEET 1 OF 2)**  Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: July 01, 2015 737-55A1097 52of71 **BOEING SERVICE BULLETIN 737-55A1097 ALERT**  **ALERT More Data**  **Qty Identification**  **Name Task**  **Step** (a) 1 MS27253-F1 Identification Plate Inspect 1 (a) Inspect the left side horizontal stabilizer identification plate for affected serial number SAIC0001-SAIC0143, SAIC0145-SAIC0625, SAIC0627-SAIC1144, SAIC1146-SAIC1601, or SAMC1602-SAMC2639. The serial number may have leading zeros in the number. The use of a flashlight and mirror may be necessary.

**FIGURE 1: LEFT SIDE HORIZONTAL STABILIZER IDENTIFICATION PLATE INSPECTION**  **(SHEET 2 OF 2)** Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: July 01, 2015 737-55A1097 53of71 **BOEING SERVICE BULLETIN 737-55A1097 ALERT**  **ALERT FIGURE 2:** **RIGHT SIDE HORIZONTAL STABILIZER IDENTIFICATION PLATE INSPECTION (SHEET 1 OF 2)**  Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: July 01, 2015 737-55A1097 54of71 **BOEING SERVICE BULLETIN 737-55A1097 ALERT**  **ALERT More Data**  **Qty Identification**  **Name Task**  **Step** (a) 1 MS27253-F1 Identification Plate Inspect 1 (a) Inspect the left side horizontal stabilizer identification plate for affected serial number SAIC0001-SAIC0143, SAIC0145-SAIC0625, SAIC0627-SAIC1144, SAIC1146-SAIC1601, or SAMC1602-SAMC2639. The serial number may have leading zeros in the number. The use of a flashlight and mirror may be necessary.

**FIGURE 2: RIGHT SIDE HORIZONTAL STABILIZER IDENTIFICATION PLATE INSPECTION**  **(SHEET 2 OF 2)** Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: July 01, 2015 737-55A1097 55of71 **BOEING SERVICE BULLETIN 737-55A1097 ALERT**  **ALERT FIGURE 3:** **LEFT SIDE HORIZONTAL STABILIZER REAR SPAR UPPER CHORD - HFEC INSPECTION TO**

**DETECT ANY CRACK 0.100 INCH OR GREATER USING A 0.050 INCH SCAN INCREMENT (SHEET 1 OF 2)**  Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: July 01, 2015 737-55A1097 56of71 **BOEING SERVICE BULLETIN 737-55A1097 ALERT**  **ALERT More Data**  **Qty Identification**  **Name Task**  **Step** (a) 1

- Horizontal Stabilizer Rear Spar Upper Chord Inspect 1 (a) Do a High Frequency Eddy Current (HFEC) inspection to detect any crack 0.100 inch or greater using a 0.050 inch scan increment in accordance with737 NDT Manual Part 6, 55-10-27

.

**FIGURE 3: LEFT SIDE HORIZONTAL STABILIZER REAR SPAR UPPER CHORD - HFEC INSPECTION TO**  **DETECT ANY CRACK 0.100 INCH OR GREATER USING A 0.050 INCH SCAN INCREMENT (SHEET 2 OF 2)**  Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: July 01, 2015 737-55A1097 57of71 **BOEING SERVICE BULLETIN 737-55A1097 ALERT**  **ALERT FIGURE 4:** **RIGHT SIDE HORIZONTAL STABILIZER REAR SPAR UPPER CHORD - HFEC INSPECTION**

**TO DETECT ANY CRACK 0.100 INCH OR GREATER USING A 0.050 INCH SCAN INCREMENT (SHEET 1 OF 2)**  Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: July 01, 2015 737-55A1097 58of71 **BOEING SERVICE BULLETIN 737-55A1097 ALERT**  **ALERT More Data**  **Qty Identification**  **Name Task**  **Step** (a) 1

- Horizontal Stabilizer Rear Spar Upper Chord Inspect 1 (a) Do a High Frequency Eddy Current (HFEC) inspection to detect any crack 0.100 inch or greater using a 0.050 inch scan increment in accordance with737 NDT Manual Part 6, 55-10-27

.

**FIGURE 4: RIGHT SIDE HORIZONTAL STABILIZER REAR SPAR UPPER CHORD - HFEC INSPECTION**  **TO DETECT ANY CRACK 0.100 INCH OR GREATER USING A 0.050 INCH SCAN INCREMENT (SHEET 2 OF 2)**  Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: July 01, 2015 737-55A1097 59of71 **BOEING SERVICE BULLETIN 737-55A1097 ALERT**  **ALERT FIGURE 5:** **LEFT SIDE HORIZONTAL STABILIZER REAR SPAR UPPER CHORD - HFEC INSPECTION TO**

**DETECT ANY CRACK 0.200 INCH OR GREATER USING A 0.100 INCH SCAN INCREMENT (SHEET 1 OF 2)**  Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: July 01, 2015 737-55A1097 60of71 **BOEING SERVICE BULLETIN 737-55A1097 ALERT**  **ALERT More Data**  **Qty Identification**  **Name Task**  **Step** (a) 1

- Horizontal Stabilizer Rear Spar Upper Chord Inspect 1 (a) Do a High Frequency Eddy Current (HFEC) inspection to detect any crack 0.200 inch or greater using a 0.100 inch scan increment in accordance with737 NDT Manual Part 6, 55-10-27

.

**FIGURE 5: LEFT SIDE HORIZONTAL STABILIZER REAR SPAR UPPER CHORD - HFEC INSPECTION TO**  **DETECT ANY CRACK 0.200 INCH OR GREATER USING A 0.100 INCH SCAN INCREMENT (SHEET 2 OF 2)**  Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: July 01, 2015 737-55A1097 61of71 **BOEING SERVICE BULLETIN 737-55A1097 ALERT**  **ALERT FIGURE 6:** **RIGHT SIDE HORIZONTAL STABILIZER REAR SPAR UPPER CHORD - HFEC INSPECTION**

**TO DETECT ANY CRACK 0.200 INCH OR GREATER USING A 0.100 INCH SCAN INCREMENT (SHEET 1 OF 2)**  Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: July 01, 2015 737-55A1097 62of71 **BOEING SERVICE BULLETIN 737-55A1097 ALERT**  **ALERT More Data**  **Qty Identification**  **Name Task**  **Step** (a) 1

- Horizontal Stabilizer Rear Spar Upper Chord Inspect 1 (a) Do a High Frequency Eddy Current (HFEC) inspection to detect any crack 0.200 inch or greater using a 0.100 inch scan increment in accordance with737 NDT Manual Part 6, 55-10-27

.

**FIGURE 6: RIGHT SIDE HORIZONTAL STABILIZER REAR SPAR UPPER CHORD - HFEC INSPECTION**  **TO DETECT ANY CRACK 0.200 INCH OR GREATER USING A 0.100 INCH SCAN INCREMENT (SHEET 2 OF 2)**  Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: July 01, 2015 737-55A1097 63of71 **BOEING SERVICE BULLETIN 737-55A1097 ALERT**  **ALERT APPENDIX A:** **LOGIC DIAGRAM FOR PARAGRAPH 1.E., COMPLIANCE: TABLE 1: HORIZONTAL STABILIZER IDENTIFICATION**  **(SHEET 1 OF 4)** Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: July 01, 2015 737-55A1097 64of71 **BOEING SERVICE BULLETIN 737-55A1097 ALERT**  **ALERT APPENDIX A:** **LOGIC DIAGRAM FOR PARAGRAPH 1.E., COMPLIANCE: TABLE 1: HORIZONTAL STABILIZER IDENTIFICATION**  **(SHEET 2 OF 4)** Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: July 01, 2015 737-55A1097 65of71 **BOEING SERVICE BULLETIN 737-55A1097 ALERT**  **ALERT APPENDIX A:** **LOGIC DIAGRAM FOR PARAGRAPH 1.E., COMPLIANCE: TABLE 1: HORIZONTAL STABILIZER IDENTIFICATION**  **(SHEET 3 OF 4)** Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: July 01, 2015 737-55A1097 66of71 **BOEING SERVICE BULLETIN 737-55A1097 ALERT**  **ALERT APPENDIX A:** **LOGIC DIAGRAM FOR PARAGRAPH 1.E., COMPLIANCE: TABLE 1: HORIZONTAL STABILIZER IDENTIFICATION**  **(SHEET 4 OF 4)** Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: July 01, 2015 737-55A1097 67of71 **BOEING SERVICE BULLETIN 737-55A1097 ALERT**  **ALERT APPENDIX B:** **LOGIC DIAGRAM FOR PARAGRAPH 1.E., COMPLIANCE: TABLE 2: HORIZONTAL STABILIZER IDENTIFICATION**  **(SHEET 1 OF 4)** Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: July 01, 2015 737-55A1097 68of71 **BOEING SERVICE BULLETIN 737-55A1097 ALERT**  **ALERT APPENDIX B:** **LOGIC DIAGRAM FOR PARAGRAPH 1.E., COMPLIANCE: TABLE 2: HORIZONTAL STABILIZER IDENTIFICATION**  **(SHEET 2 OF 4)** Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: July 01, 2015 737-55A1097 69of71 **BOEING SERVICE BULLETIN 737-55A1097 ALERT**  **ALERT APPENDIX B:** **LOGIC DIAGRAM FOR PARAGRAPH 1.E., COMPLIANCE: TABLE 2: HORIZONTAL STABILIZER IDENTIFICATION**  **(SHEET 3 OF 4)** Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: July 01, 2015 737-55A1097 70of71 **BOEING SERVICE BULLETIN 737-55A1097 ALERT**  **ALERT APPENDIX B:** **LOGIC DIAGRAM FOR PARAGRAPH 1.E., COMPLIANCE: TABLE 2: HORIZONTAL STABILIZER IDENTIFICATION**  **(SHEET 4 OF 4)** Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: July 01, 2015 737-55A1097 71of71 **BOEING SERVICE BULLETIN 737-55A1097 ALERT**  **ALERT**