### Commercial **Airplanes** 

# 737 Service Bulletin **SPECIAL ATTENTION Number: 737-21-1165**  Original Issue: January 07, 2010 Revision 2: April 30, 2012 ATA System: 2133 **SUBJECT:**AIR CONDITIONING - Cabin Pressure Indication and Warning System - Redundant Pressure Switch Installation 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 © 2010 Boeing. Unpublished Work. All Rights Reserved. Treatment of this document and its content is governed by contract with Boeing. Rights to use this document are licensed on a per aircraft basis and such rights may not be transferable. For more information, contact The Boeing Company. Boeing, the Boeing signature, the Boeing symbol, 707, 717, 727, 737, 747, 757, 767, 777, 787, DreamlinerTM, BBJ, DC-8, DC-9, DC-10, KC-10, KDC-10, MD-10, MD-11, MD-80, MD-88, MD-90, P-8A, Poseidon and Boeing liveries are all trademarks owned by The Boeing Company; and no trademark license is granted in connection with this document unless provided in writing by Boeing. BOEING is a trademark of Boeing Management Company.

Original Issue: January 07, 2010 737-21-1165 Revision 2: April 30, 2012 1 of 15 5.0Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 07, 2010 737-21-1165 Revision 2: April 30, 2012 2 of 15 **BOEING SERVICE BULLETIN 737-21-1165**

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### Commercial **Airplanes** 

# 737 Service Bulletin **SPECIAL ATTENTION Short Form Revision**  **Number: 737-21-1165** Original Issue: January 07, 2010 Revision 2: April 30, 2012 ATA System: 2133 **SUBJECT:**AIR CONDITIONING - Cabin Pressure Indication and Warning System - Redundant Pressure Switch Installation Revision 2 is sent to change information. Only the changed information is described below. Revision 1 and Revision 2 are necessary to do the service bulletin. **COMPLIANCE INFORMATION RELATED TO THIS REVISION** Federal Aviation Administration (FAA) Notice of Proposed Rule Making NPRM 2011-NM-074-AD, is related to this service bulletin. No more work is necessary on the airplanes changed in accordance with Revision 1 of this service bulletin. **REASON FOR REVISION** This revision is sent to advise operators that in Figures 12 and 20, the illustration has been changed to show wire references W5514 and W5156 as dashed. Weight and Balance information is changed to "None" for Group 4 and Group 7 airplanes. An incorrect AMM reference has been removed from Work Instructions and Existing Data. The W5514-0018-22 wire has been deleted from wire kit 280A3147-106. Two new contacts BACC47DR1 are added to the Parts and Materials Supplied by the Operator to replace the incorrect pin contacts in Figures 14 and 17. Also, a new splice D-436-61 is added to the Parts and Materials Supplied by the Operator to replace the incorrect splice in Figures 12 and 20. **REVISION HISTORY** January 07, 2010 Original Issue: July 16, 2010 Revision 1: April 30, 2012 Revision 2:
**EFFECTIVITY** 737-600/-700/-700C/-800/-900/-900ER Airplanes. Refer to Paragraph 1.A.1., Airplanes, in Revision 1 for the list of affected airplanes.

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 07, 2010 737-21-1165 Revision 2: April 30, 2012 3 of 15**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. **EXISTING INFORMATION** The following is the existing information in the service bulletin: 1. Page 10 - Summary, Compliance, reads as follows: 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 72 months after the date on this service bulletin. 2. Page 26 - Paragraph 1.B, Concurrent Requirements, Boeing Service Bulletin in the table reads as 737-31A1332 Original Issue, Revision 1 3. Page 28 - Paragraph 1.E, Compliance, reads as follows: 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 72 months after the date on this service bulletin. 4. Page 31 - Paragraph 1.J.1., Existing Data, e. 737-600/700/800/900 Aircraft Maintenance Manual (AMM) 21-33-00, 21-33-04, 24-22-00, 25-11-01, 31-51-00, 31-51-04, 34-16-00, 52-40-00 5. Page 31 - Paragraph 1.H, Weight and Balance Changes reads as follows:**Change in Moment (Pound-Inch es)**  **Change in Weight (Pounds) Airplane** 

+510 +2.5 737-600 +375 +2.5 737-700/700C +80 +2.5 737-800 -75 +2.5 737-900/900ER 6. Page 32 - Paragraph 1.K.1., Publications, 737 Illustrated Parts Catalog 21-33, 31-51

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 07, 2010 737-21-1165 Revision 2: April 30, 2012 4 of 15 **BOEING SERVICE BULLETIN 737-21-1165**7. Page 39 - Paragraph 2.C.1., Kits/Parts, wire kit 280A3147-106, Wire, Identified as W5514-0018-22, Length 206 inches 8. Page 40 - In Paragraph 2.C.1, Kits/Parts, kits/parts table, wire kits 280A3147-104 and 280A3147-105, the part number reads as BACC47DP1. 9. Page 42 - In Paragraph 2.C.2., Parts and Materials Supplied by the Operator, the table appears as follows:
**Notes Name**  **QTY Part Number / Specifica-**  **tion** (a) (b) (c) Aural Warning Module M315 1 69-78214-4 (a) You can get the new part by reworking the existing part as given in BAE Systems SB 69-78214-31-03. (b) BAE Systems Controls Inc. (Cage Code 89954), 600 Main Street, Johnson City, NY13790-1806, USA. (c) If you use the existing part, you cancel the effect of the change given in this service bulletin.

10. Page 44 - In Paragraph 3.B., Work Instructions, Step 5 reads as follows: At the lower forward fuselage, open the Forward Access Door 112A to get access into the area forward of the nose landing gear wheel well. Refer to 737-600/700/800/900 AMM 52-40-00 as an accepted procedure.

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 07, 2010 737-21-1165 Revision 2: April 30, 2012 5 of 15 **BOEING SERVICE BULLETIN 737-21-1165**11. Page 68 - In FIGURE 4, sheet 1, the illustration appears as follows:

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 07, 2010 737-21-1165 Revision 2: April 30, 2012 6 of 15 **BOEING SERVICE BULLETIN 737-21-1165**12. Page 71 - In FIGURE 6, sheet 1, the illustration appears as follows:

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 07, 2010 737-21-1165 Revision 2: April 30, 2012 7 of 15 **BOEING SERVICE BULLETIN 737-21-1165**13. Page 89 - In FIGURE 12, sheet 1, the illustration appears as follows:

14. Page 90 - In FIGURE 12, flag note table, flag note 6, the part number reads as D-436-59. 15. Page 98 - In FIGURE 14, flag note table, flag note 4, the part number reads as BACC47DP1. 16. Page 107 - In FIGURE 17, flag note table, flag note 4, the part number reads as BACC47DP1.

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 07, 2010 737-21-1165 Revision 2: April 30, 2012 8 of 15 **BOEING SERVICE BULLETIN 737-21-1165**17. Page 112 - In FIGURE 20, sheet 1, the illustration appears as follows:

18. Page 113 - In FIGURE 20, flag note table, flag note 6, the part number reads as D-436-59. **CHANGED INFORMATION** The following is the changed information in the service bulletin: 1. Page 10 - Summary, Compliance, reads as follows: Federal Aviation Administration (FAA) Notice of Proposed Rule Making NPRM 2011-NM-074-AD, is related to this service bulletin. Boeing recommends that the change given in this service bulletin be done within 72 months after the date on this service bulletin.

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 07, 2010 737-21-1165 Revision 2: April 30, 2012 9 of 15 **BOEING SERVICE BULLETIN 737-21-1165**2. Page 26 - Paragraph 1.B, Concurrent Requirements, Boeing Service Bulletin in the table reads as 737-31A1332 Revision 1, Revision 2, Revision 3 3. Page 28 - Paragraph 1.E, Compliance, reads as follows: Federal Aviation Administration (FAA) Notice of Proposed Rule Making NPRM 2011-NM-074-AD, is related to this service bulletin. Boeing recommends that the change given in this service bulletin be done within 72 months after the date on this service bulletin. 4. Page 31, 32 - Paragraph 1.J.1., Existing Data, – e. 737-600/700/800/900 Aircraft Maintenance Manual (AMM) 21-33-00, 21-33-04, 24-22-00, 25-11-01, 31-51-00, 31-51-04, 34-16-00 – m. Federal Aviation Administration (FAA) Notice of Proposed Rule Making NPRM 2011-NM-074-AD 5. Page 31 - Paragraph 1.H, Weight and Balance Changes reads as follows: Group 1-3, 5-6 **Change in Moment (Pound-Inch es)**  **Change in Weight (Pounds) Airplane** 

+510 +2.5 737-600 +375 +2.5 737-700/700C +80 +2.5 737-800 -75 +2.5 737-900/900ER Group 4, 7 None. 6. Page 32 - Paragraph 1.K.1., Publications, 737 Illustrated Parts Catalog 11-32, 21-33, 31-51 7. Page 39 - Paragraph 2.C.1., Kits/Parts, wire kit 280A3147-106, Wire W5514-0018-22 has been deleted. 8. Page 40 - In Paragraph 2.C.1, Kits/Parts, kits/parts table, wire kits 280A3147-104 and 280A3147-105, a note (f) for the part number BACC47DP1 reads as follows: (f) This part from the wire kits 280A3147-104 and 280A3147-105 can be scrapped because it is replaced with the part number BACC47DR1. 9. Page 42 - In Paragraph 2.C.2., Parts and Materials Supplied by the Operator, the table appears as follows:
**Notes Name**  **QTY Part Number / Specifica-**  **tion** (a) (b) (c) Aural Warning Module M315 1 69-78214-4

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 07, 2010 737-21-1165 Revision 2: April 30, 2012 10 of 15 **BOEING SERVICE BULLETIN 737-21-1165 Notes**  **Name QTY**  **Part Number / Specifica- tion**  Contact, Socket 2 BACC47DR1 Splice 1 D-436-61 (a) You can get the new part by reworking the existing part as given in BAE Systems SB 69-78214-31-03. (b) BAE Systems Controls Inc. (Cage Code 89954), 600 Main Street, Johnson City, NY13790-1806, USA. (c) If you use the existing part, you cancel the effect of the change given in this service bulletin.

10. Page 44 - In Paragraph 3.B., Work Instructions, Step 5 reads as follows: At the lower forward fuselage, open the Forward Access Door 112A to get access into the area forward of the nose landing gear wheel well.

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 07, 2010 737-21-1165 Revision 2: April 30, 2012 11 of 15 **BOEING SERVICE BULLETIN 737-21-1165**11. Page 68 - In FIGURE 4, sheet 1, the illustration appears as follows:

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 07, 2010 737-21-1165 Revision 2: April 30, 2012 12 of 15 **BOEING SERVICE BULLETIN 737-21-1165**12. Page 71 - In FIGURE 6, sheet 1, the illustration appears as follows:

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 07, 2010 737-21-1165 Revision 2: April 30, 2012 13 of 15 **BOEING SERVICE BULLETIN 737-21-1165**13. Page 89 - In FIGURE 12, sheet 1, the illustration appears as follows:

14. Page 90 - In FIGURE 12, flag note table, flag note 6, the part number reads as D-436-61. A note (g) reads as follows: (g) This part replaces the D-436-59 splice from the 280A3154-101 wire kit. 15. Page 98 - In FIGURE 14, flag note table, flag note 4, the part number reads as BACC47DR1. A note (g) reads as follows: (g) This part replaces the BACC47DP1 contacts from the 280A3147-105 wire kit. 16. Page 107 - In FIGURE 17, flag note table, flag note 4, the part number reads as BACC47DR1. A note (f) reads as follows: (f) This part replaces the BACC47DP1 contacts from the 280A3147-104 wire kit.

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 07, 2010 737-21-1165 Revision 2: April 30, 2012 14 of 15 **BOEING SERVICE BULLETIN 737-21-1165**17. Page 112 - In FIGURE 20, sheet 1, the illustration appears as follows:

18. Page 113 - In FIGURE 20, flag note table, flag note 6, the part number reads as D-436-61. A note (g) reads as follows: (g) This part replaces the D-436-59 splice from the 280A3154-101 wire kit.

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 07, 2010 737-21-1165 Revision 2: April 30, 2012 15 of 15 **BOEING SERVICE BULLETIN 737-21-1165**