### Commercial **Airplanes** 

# 737 Service Bulletin **ALERT Number: 737-22A1211**  Original Issue: April 13, 2010 ATA System: 2200 **SUBJECT:** AUTOFLIGHT - Digital Flight Control System - Flight Control Computer Software Change Export of this technology is controlled under the United States Export Administration Regulations (EAR) (15 CFR 730-774). An export license may be required before it is used for development, production or use by foreign persons from specific countries. The controller of this data has the individual responsibility to abide by all export laws. 9E991 ECCN: 

## BOEING PROPRIETARY, CONFIDENTIAL, AND/OR TRADE SECRET Copyright © 2010 The Boeing Company Unpublished Work - All Rights Reserved Boeing claims copyright in each page of this document only to the extent that the page contains copyrightable subject matter.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

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 13, 2010 737-22A1211 1 of 18 3.0BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 13, 2010 737-22A1211 2 of 18 **BOEING SERVICE BULLETIN 737-22A1211 ALERT**  **ALERT**

BLANK PAGE**Table of Contents** Summary...................................................... 5 1. PLANNING INFORMATION ........................................ 7 A. Effectivity................................................ 7 1. Airplanes............................................. 7 2. Spares Affected . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 B. Concurrent Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 C. Reason . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 D. Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 E. Compliance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 F. Approval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 G. Manpower . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 H. Weight and Balance Changes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 I. Electrical Load Data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 J. References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 1. Existing Data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 2. Data supplied with this Service Bulletin. . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 3. Installation Drawings Used in the Preparation of this Service Bulletin. . . . . . . . . . . . 13 K. Publications Affected . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 L. Interchangeability and Intermixability of Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 2. MATERIAL INFORMATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 A. Material - Price and Availability. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 B. Industry Support Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 C. Parts Necessary For Each Airplane. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 1. Kits/Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 2. Parts and Materials Supplied by the Operator. . . . . . . . . . . . . . . . . . . . . . . . 15 3. Parts Modified and Reidentified. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 4. Parts Removed and Not Replaced. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 D. Parts Necessary to Change Spares. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 E. Special Tooling - Price and Availability. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 F. Special Tooling Necessary to do this Service Bulletin. . . . . . . . . . . . . . . . . . . . . . . 16 3. ACCOMPLISHMENT INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 A. GENERAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 B. WORK INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 13, 2010 737-22A1211 3 of 18 **BOEING SERVICE BULLETIN 737-22A1211 ALERT**  **ALERT**BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 13, 2010 737-22A1211 4 of 18 **BOEING SERVICE BULLETIN 737-22A1211 ALERT**  **ALERT**

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### Commercial **Airplanes** 

# 737 Service Bulletin **ALERT Summary**  **Number: 737-22A1211** Original Issue: April 13, 2010 ATA System: 2200 **SUBJECT:** AUTOFLIGHT - Digital Flight Control System - Flight Control Computer Software Change 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 do a part number check of the Flight Control Computer (FCC) Operational Program Software (OPS) installed in the Flight Control Computers. If the software part number is not 2276-COL-AC1-05 (P4.0) or 2275-COL-AC1-06 (P5.0), new software must be installed. The new software will reduce the incidence of unflagged Radio Altimeter outputs that cause a premature autothrottle landing retard.As a result of in-service incidents, it was found that an erroneous unflagged Captain's Radio Altimeter output will cause the autothrottle to enter Landing Flare Retard mode prematurely on approach. If this change is not done, an erroneous unflagged Captain's Radio Altimeter output on a manual or single channel autopilot approach could result in premature autothrottle landing flare retard and the loss of automatic speed control. For more information refer to Boeing Service letters (SL) 737-SL-22-057 and 737-SL-22-059, which are related to this service bulletin. Fleet Team Digest (FTD) 737NG FTD 34-09008 is related to this service bulletin. Boeing Service Related Problem (SRP) 737-SRP-22-0032 is related to this service bulletin. **ACTION** Do a part number check of the Flight Control Computers (FCC) Operational Program Software (OPS). If the software part number installed is not part number 2276-COL-AC1-05 or 2275-COL-AC1-06, install new software. **EFFECTIVITY** 737-600/-700/-700C/-800/-900 Airplanes. Refer to Paragraph 1.A., Effectivity, Airplanes, for the list of affected airplanes.

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 13, 2010 737-22A1211 5 of 18**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. Boeing recommends that the change given in this service bulletin be done within 90 days after the original issue date of this service bulletin. **INDUSTRY SUPPORT INFORMATION** Boeing warranty remedies are not available for the configuration changes given in this service bulletin. **MANPOWER Elapsed Hours**  **Total Task Hours Airplanes**  1.00 1.00 All
**MATERIAL INFORMATION** Operator Supplied Parts/Materials. Refer to Paragraph 2.A., Material - Price and Availability

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 13, 2010 737-22A1211 6 of 18 **BOEING SERVICE BULLETIN 737-22A1211 ALERT**  **ALERT**

### Commercial **Airplanes** 

# 737 Service Bulletin **ALERT Number: 737-22A1211**  Original Issue: April 13, 2010 ATA System: 2200 **SUBJECT:** AUTOFLIGHT - Digital Flight Control System - Flight Control Computer Software Change 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 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 Airplanes without Fight Control Conputer Operational Program Software part number 2276-COL-AC1-05 or 2275-COL-AC1-06 installed - 1

Airplane Models: 737-600, 737-700, 737-700C, 737-800, 737-900 **Group Variable Number**  1 YA129 - YA199 1 YA372 - YA377 1 YA630 - YA631 1 YA642 1 YA666 - YA667 1 YA709 - YA710

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 13, 2010 737-22A1211 7 of 18**Group Variable Number**  1 YA859 - YA862 1 YA971 - YA978 1 YB120 - YB132 1 YB156 - YB158 1 YB163 - YB164 1 YB184 1 YB208 1 YB371 - YB391 1 YB522 - YB526 1 YB541 - YB544 1 YB567 - YB598 1 YB606 - YB632 1 YB651 1 YB656 1 YB851 - YB863 1 YB871 - YB874 1 YB881 - YB890 1 YB901 - YB903 1 YB911 1 YB961 - YB964 1 YC083 1 YC170 1 YC186 - YC189 1 YC201 - YC203 1 YC206 - YC207 1 YC305 1 YC384 - YC387 1 YC393 - YC394 1 YC742 - YC743 1 YD007 1 YD056 - YD057 1 YD108 - YD110 1 YD156 - YD159

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 13, 2010 737-22A1211 8 of 18 **BOEING SERVICE BULLETIN 737-22A1211 ALERT**  **ALERT Group**  **Variable Number** 1 YD218 - YD219 1 YD261 1 YD331 - YD334 1 YD412 - YD414 1 YD484 - YD485 1 YD491 - YD495 1 YD508 - YD512 1 YD535 1 YD561 - YD564 1 YD571 - YD572 1 YD591 - YD595 1 YD651 - YD655 1 YE205 - YE206 1 YE321 - YE326 1 YE371 - YE379 1 YG091 - YG096 1 YG101 - YG102 1 YG202 - YG205 1 YG211 - YG213 1 YG507 - YG509 1 YJ003 - YJ005 1 YJ011 - YJ013 1 YJ021 1 YJ480 1 YJ531 - YJ553 1 YJ591 - YJ594 1 YJ677 - YJ685 1 YJ690 - YJ693 1 YJ805 - YJ867 1 YJ901 - YJ902 1 YJ911 - YJ928 1 YJ931 - YJ936 1 YJ941 - YJ947

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 13, 2010 737-22A1211 9 of 18 **BOEING SERVICE BULLETIN 737-22A1211 ALERT**  **ALERT Group**  **Variable Number** 1 YK001 - YK007 1 YK101 - YK104 1 YK111 - YK112 1 YK121 - YK122 1 YK131 - YK132 1 YK136 - YK137 1 YK141 - YK142 1 YK146 - YK147 1 YK151 - YK154 1 YK161 - YK162 1 YK301 - YK305 1 YK321 - YK332 1 YK361 - YK369 1 YK401 - YK406 1 YK426 - YK427 1 YK431 - YK436 1 YK456 - YK460 1 YK476 1 YK480 - YK484 1 YK511 - YK514 1 YK551 - YK563 1 YK571 1 YK601 - YK602 1 YK611 - YK613 1 YK621 - YK623 1 YK631 1 YK641 - YK642 1 YK701 - YK707 1 YK801 - YK818 1 YK901 - YK906 1 YK941 1 YL001 - YL004 1 YL011

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 13, 2010 737-22A1211 10 of 18 **BOEING SERVICE BULLETIN 737-22A1211 ALERT**  **ALERT Group**  **Variable Number** 1 YM101 - YM103 1 YM201 - YM211 1 YM251 - YM297 1 YM471 1 YM481 - YM484 1 YM501 - YM507 1 YM521 - YM522 1 YM541 1 YM551 - YM553 1 YM571 - YM572 1 YM591 - YM593 1 YN001 - YN006 1 YN061 1 YN101 - YN105 2. Spares Affected None. **B. Concurrent Requirements** None. **C. Reason** This service bulletin gives instructions to do a part number check of the Flight Control Computer (FCC) Operational Program Software (OPS) installed in the Flight Control Computers. If the software part number is not 2276-COL-AC1-05 (P4.0) or 2275-COL-AC1-06 (P5.0), new software must be installed. The new software will reduce the incidence of unflagged Radio Altimeter outputs that cause a premature autothrottle landing retard.As a result of in-service incidents, it was found that an erroneous unflagged Captain's Radio Altimeter output will cause the autothrottle to enter Landing Flare Retard mode prematurely on approach. If this change is not done, an erroneous unflagged Captain's Radio Altimeter output on a manual or single channel autopilot approach could result in premature autothrottle landing flare retard and the loss of automatic speed control. For more information refer to Boeing Service letters (SL) 737-SL-22-057 and 737-SL-22-059, which are related to this service bulletin. Fleet Team Digest (FTD) 737NG FTD 34-09008 is related to this service bulletin. Boeing Service Related Problem (SRP) 737-SRP-22-0032 is related to this service bulletin.

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 13, 2010 737-22A1211 11 of 18 **BOEING SERVICE BULLETIN 737-22A1211 ALERT**  **ALERT D. Description**  Inspect the part number of the Flight Control Computer (FCC) Operational Program Software (OPS). If the software part number installed is not part number 2276-COL-AC1-05 or 2275-COL-AC1-06, install new software. The work in this service bulletin is done in the maintenance zone(s) given below.
**Affected Maintenance Zones Zone**  **Model** 212 737-600, 737-700, 737-700C, 737-800, 737-900 **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. Boeing recommends that the change given in this service bulletin be done within 90 days after the original issue date of this service bulletin. **F. Approval** This service bulletin was examined by the Federal Aviation Administration (FAA). The changes specified in this service bulletin comply with the applicable regulations and are FAA approved, as well as European Aviation Safety Agency (EASA)/Joint Aviation Authorities (JAA) approved for all EASA/JAA approved airplanes listed in the service bulletin effectivity. This service bulletin and its approval were based on the airplane in its original Boeing delivery configuration or as modified by other approved Boeing changes. If an airplane has a non-Boeing modification or repair that affects a component or system also affected by this service bulletin, the operator is responsible for obtaining appropriate regulatory agency approval before incorporating this service bulletin. **G. Manpower** The table below shows an estimate of the task hours necessary to do this change 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. **NOTE:** This estimate gives general service bulletin incorporation time. The specific software data transfer times can be found in 737-600/700/800/900 AMM 20-15-11.

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 13, 2010 737-22A1211 12 of 18 **BOEING SERVICE BULLETIN 737-22A1211 ALERT**  **ALERT Elapsed Hours**  **Task Hours Number of Persons**  **Task** 0.50 0.50 1 Software Inspection 0.50 0.50 1 Install Software (a) 1.00 1.00 TOTAL FOR EACH AIRPLANE (a) Only necessary if P4.0 or P5.0 software is not installed. **H. Weight and Balance Changes** None. **I. Electrical Load Data** Not changed. **J. References** 1. Existing Data a. Boeing Service Letter 737-SL-22-057, 737-SL-22-059 b. Boeing Service Related Problem (SRP) 737-SRP-22-0032 c. 737-600/700/800/900 Aircraft Maintenance Manual (AMM) 20-15-11, 22-11-33 d. 737NG Fleet Team Digest (FTD) 34-09008 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**  22-11 737 Illustrated Parts Catalog 2. Damage Tolerance Based Structural Inspections: Boeing has evaluated the repairs and/or changes in this service bulletin for effects on Fatigue Critical Structure (FCS) and for changes to Damage Tolerance Inspections (DTI) required in the Maintenance Program. This service bulletin does not affect FCS, therefore DTIs are not necessary.

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 13, 2010 737-22A1211 13 of 18 **BOEING SERVICE BULLETIN 737-22A1211 ALERT**  **ALERT L. Interchangeability and Intermixability of Parts**  Refer to Paragraph 2.C., Parts Necessary for Each Airplane, for interchangeability and intermixability information.

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 13, 2010 737-22A1211 14 of 18 **BOEING SERVICE BULLETIN 737-22A1211 ALERT**  **ALERT 2. MATERIAL INFORMATION**  **A. Material - Price and Availability** The operator can supply the parts and materials shown in Paragraph 2.C., Parts Necessary for Each Airplane. As an alternative, operators can purchase the parts from Boeing Spares. This service bulletin does not show the Boeing price and supply data. **B. Industry Support Information** Boeing warranty remedies are not available for the configuration changes given in this service bulletin. **C. Parts Necessary For Each Airplane** 1. Kits/Parts None. 2. Parts and Materials Supplied by the Operator
**Notes Software Name**  **Software Part Number Media Set Name**  **Media Set Part Num- ber**  (a) (b) (c) (d) (e) (f) FCC OPS 2276-COL-AC1-05 FCC OPS DISK SET 831-5854-140 (a) (b) (c) (d) (e) (f) (g) FCC OPS 2275-COL-AC1-06 FCC OPS DISK SET 831-5854-150

(a) This software part number is used in production. Operators may already have this media set. (b) Do not install previous versions of this software after installation of the new software part number. (c) Install this software only if the Flight Control Computers part number 822-1604-101 or 822-1604-151 are installed on the airplane. (d) The existing media set part number is 831-5854-111 or 831-5854-120 or 831-5854-130. (e) Only one media set is necessary for each operator. (f) The media set can be obtained directly from the supplier: Rockwell Collins Aerospace & Electronics Inc. DRA RC Displays Systems (09344), 400 Collins Road N.E., M/S 133-100 Cedar Rapids, Lowa 52498 (g) This is the preferred software option.
3. Parts Modified and Reidentified None. 4. Parts Removed and Not Replaced None.

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 13, 2010 737-22A1211 15 of 18 **BOEING SERVICE BULLETIN 737-22A1211 ALERT**  **ALERT D. Parts Necessary to Change Spares**  None. **E. Special Tooling - Price and Availability** None. **F. Special Tooling Necessary to do this Service Bulletin** No special tools or equipment are necessary to do the change in this service bulletin. But, maintenance and overhaul tools in the manuals given in Paragraph 1.J., References, can be necessary. Examine operator tool supply to make sure all necessary tools are available.

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 13, 2010 737-22A1211 16 of 18 **BOEING SERVICE BULLETIN 737-22A1211 ALERT**  **ALERT 3. ACCOMPLISHMENT INSTRUCTIONS**  **A. GENERAL INFORMATION CAUTION:**  KEEP THE WORK AREA, WIRES AND ELECTRICAL BUNDLES CLEAN OF METAL PARTICLES OR CONTAMINATION WHEN YOU USE TOOLS. UNWANTED MATERIAL, METAL PARTICLES OR CONTAMINATION CAUGHT IN WIRE BUNDLES CAN CAUSE DAMAGE TO THE BUNDLES. DAMAGED WIRE BUNDLES CAN CAUSE SPARKS OR OTHER ELECTRICAL DAMAGE. **NOTE:** 1. The instructions identified in Paragraph 3.B., Work Instructions give the recommended sequence of steps. 2. Manual titles are referred to by acronyms. Refer to Paragraph 1.J., References, for definition of the acronyms. 3. Obey all of the warnings and cautions given in the specified manual sections. 4. 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. 5. Refer to 737-600/700/800/900 AMM 20-15-11 for on-airplane software installation maintenance practices and data transfer times as accepted procedures. **B. WORK INSTRUCTIONS** 1. Get access to the flight deck and do the Software Installation Test from the Flight Management Computer System (FMCS) Computer Display Unit (CDU). Refer to 737-600/700/800/900 AMM 22-11-33 as an accepted procedure. 2. Inspect the Flight Control Computers (FCC) Operational Program Software (OPS) part numbers. a. If the software part number is listed in Table 1 below, install new software. Refer to 737-600/700/800/900 AMM 22-11-33 as an accepted procedure.
**Table 1 Reference Version**  **Number Diskette Set - Rockwell**  **Collins Part Number Diskette Set - Boeing**  **Part Number Operation Program**  **Software Part Number** P1.1 831-5854-111 S241A100-502 2271-COL-AC1-02 P2.0 831-5854-120 S241A100-503 2270-COL-AC1-03 P3.0 831-5854-130 S241A100-504 2277-COL-AC1-04 b. If the software part number is listed in Table 2 below, no more work is necessary.

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 13, 2010 737-22A1211 17 of 18 **BOEING SERVICE BULLETIN 737-22A1211 ALERT**  **ALERT Table 2**  **Reference Version Number**  **Diskette Set - Rockwell Collins Part Number**  **Diskette Set - Boeing Part Number**  **Operation Program Software Part Number**  P4.0 831-5854-140 S241A100-505 2276-COL-AC1-05 P5.0 831-5854-150 S241A100-506 2275-COL-AC1-06 (a) (a) Software part number 2275-COL-AC1-06 is the preferred software option.

3. Put the airplane back to a serviceable condition.

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 13, 2010 737-22A1211 18 of 18 **BOEING SERVICE BULLETIN 737-22A1211 ALERT**  **ALERT**