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Commercial Airplanes 737 Service Bulletin
SPECIAL ATTENTION Number: 737-33-1146 Original Issue: November 02, 2011 ATA System: 3340 SUBJECT: LIGHTS - Strobe Position Lights - Lightning Protection of the Tail Strobe Light system wiring 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.
9E991ECCN:
BOEING PROPRIETARY, CONFIDENTIAL, AND/OR TRADE SECRET Copyright © 2011 The Boeing Company Unpublished Work - All Rights Reserved Boeing claims copyright in each page of this document only to the extent that the page contains copyrightable subject matter.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.
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Original Issue: November 02, 2011 737-33-1146 1 of 78
5.0
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BLANK PAGE
Table of Contents
Summary5
1. PLANNING INFORMATION9
A. Effectivity9
1. Airplanes9
2. Spares Affected ........................................ 2 3 B. Concurrent Requirements ...................................... 2 3 C. Reason ................................................ 2 3 D. Description .............................................. 2 3 E. Compliance .............................................. 2 4 F. Approval ............................................... 2 4 G. Manpower .............................................. 2 5 H. Weight and Balance Changes .................................... 2 7 I. Electrical Load Data ......................................... 2 8 J. References .............................................. 2 8
1. Existing Data .......................................... 2 8
2. Data supplied with this Service Bulletin ............................ 2 8
3. Installation Drawings Used in the Preparation of this Service Bulletin ............ 2 8 K. Publications Affected ........................................ 2 8 L. Interchangeability and Intermixability of Parts ........................... 2 9
2. MATERIAL INFORMATION ........................................ 3 1 A. Material - Price and Availability ................................... 3 1 B. Industry Support Information .................................... 3 2 C. Parts Necessary For Each Airplane ................................. 3 2
1. Kits/Parts ............................................ 3 2
2. Parts and Materials Supplied by the Operator ........................ 3 6
3. Parts Modified and Reidentified ................................ 3 6
4. Parts Removed and Not Replaced .............................. 3 7 D. Parts Necessary to Change Spares ................................. 3 7 E. Special Tooling - Price and Availability ............................... 3 7 F. Special Tooling Necessary to do this Service Bulletin ....................... 3 7
3. ACCOMPLISHMENT INSTRUCTIONS .................................. 3 9 A. GENERAL INFORMATION ..................................... 3 9 B. WORK INSTRUCTIONS ....................................... 4 0 FIGURE 1: REMOVE THE TAIL ANTI-COLLISION LIGHT ASSEMBLY [Group 1, 3] .......... 4 2 FIGURE 2: REMOVE THE TAIL ANTI-COLLISION LIGHT ASSEMBLY [Group 2] ........... 4 4 FIGURE 3: INSTALLATION OF NEW DISCONNECT BRACKET AT THE STA 1156 BULKHEAD [Group 1, Configuration 1; Group 3] ................................... 4 6 FIGURE 4: INSTALLATION OF NEW DISCONNECT BRACKET AT THE STA 1156 BULKHEAD [Group 1, Configuration 2] ......................................... 4 8 FIGURE 5: REMOVAL OF SGLA DISCONNECT BRACKET AT STA 1156 BULKHEAD [Group 2] . . 50 FIGURE 6: INSTALLATION OF NEW DISCONNECT BRACKET AT STA 1156 BULKHEAD [Group 2] . 52 FIGURE 7: WIRE ROUTING FOR WIRE BUNDLE W4724 AND INSTALLATION OF CLAMP [Group 1-2] .................................................. 5 4 FIGURE 8: WIRE CHANGE FOR WIRE BUNDLE W4724 [Group 1-2] ................. 5 6 FIGURE 9: WIRE ROUTING FOR WIRE BUNDLE W5726 AND INSTALLATION OF CLAMP [Group 3] . 58
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FIGURE 10: WIRE CHANGE FOR WIRE BUNDLE W5726 [Group 3] ................... 6 0 FIGURE 11: WIRE ROUTING FOR WIRE BUNDLE W7150 ........................ 6 3 FIGURE 12: WIRE CHANGE FOR WIRE BUNDLE W7150 ........................ 6 4 FIGURE 13: WIRE ROUTING FOR WIRE BUNDLE W7152 AND INSTALLATION OF POTTED INSERT AND SPACERS ........................................ 6 5 FIGURE 14: WIRE CHANGE FOR WIRE BUNDLE W7152 ........................ 6 8 FIGURE 15: INSTALLATION AND BONDING RESISTANCE CHECK FOR THE TAIL STROBE LIGHT HOUSING ASSEMBLY, THE TAIL CONE FAIRING ASSEMBLIES, AND THE L46 LIGHT CONNECTOR PLUG [Group 1, 3] ............................... 6 9 FIGURE 16: INSTALLATION AND BONDING RESISTANCE CHECK FOR THE TAIL STROBE LIGHT HOUSING ASSEMBLY, THE TAIL CONE FAIRING ASSEMBLIES, AND THE L46 LIGHT CONNECTOR PLUG [Group 2] ................................ 7 4
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Original Issue: November 02, 2011 737-33-1146 4 of 78 BOEING SERVICE BULLETIN 737-33-1146
Commercial Airplanes 737 Service Bulletin
SPECIAL ATTENTION SummaryNumber: 737-33-1146Original Issue: November 02, 2011 ATA System: 3340 SUBJECT: LIGHTS - Strobe Position Lights - Lightning Protection of the Tail Strobe Light system wiring BOEING RECOMMENDS THAT EACH OPERATOR EXAMINE THIS SERVICE BULLETIN IMMEDIATELY.
CONCURRENT REQUIREMENTS None.
BACKGROUND The tail strobe light, located at the aft end of section 48, is not electrically bonded to a primary structure in the airplane. In case of a direct lightning strike to the tail strobe light, electromagnetic coupling and large transient voltages can be transmitted into the pressure vessel and couple to wires of the airplane systems that are routed with the light wires. Those large transient voltages can possibly cause damage to the operation of the airplane's electrical systems and avionics equipment. In addition to electromagnetic coupling, electrical current on the tail strobe light system wiring could create an ignition source. This service bulletin will add lightning protection to the tail strobe light system wiring and minimize potential fire hazard created by induced electrical current. This is done by adding 2 electrical ground paths. The primary ground path passes through the APU exhaust system to the airplane metal structure. The secondary ground path passes through the added wire bundle shields to ground any transient voltages. The electrical bonding will prevent the effects of lightning strikes to the airplane system. If the change in this service bulletin is not done, a direct lightning strike to the tail strobe light can cause damage to the operation of the airplane's systems.
This service bulletin gives the instructions and a kit of parts to change the tail strobe light installation and wiring.
Boeing Service Related Problem (SRP) 737NG-SRP-33-0052 is related to this service bulletin.
ACTION (PRR 38275-138S) At the aft end of the airplane, remove the tail strobe light L46 and replace the light housing. Drill holes on the new light housing. Install the light housing and tail strobe light L46.
In the tail cone area, install a new STA 1156 bulkhead disconnect bracket. Install the new wire bundle W7152 that runs from the tail strobe light to the new disconnect bracket and install a potted insert and spacers on the tail cone wall to hold the new wire bundle.
Make wiring changes to wire bundles W4724, W5726, and W7150 to remove the tail strobe light wires.
Measure the electrical bonding of the new STA 1156 bulkhead disconnect bracket and the new connector D44582.
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Original Issue: November 02, 2011 737-33-1146 5 of 78
Measure the electrical bonding of the tail strobe light, the light housing and aft fairing to make sure of the correct resistance.
Do an operational test of tail strobe light L46 to make sure the light operates correctly.
EFFECTIVITY All 737-600/-700/-700C/-800/-900/-900ER Airplane(s). Refer to Paragraph 1.A.1., Airplanes, for the list of affected airplane(s).
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 72 months after the original issue date of this service bulletin.
INDUSTRY SUPPORT INFORMATION Boeing warranty remedies are available for airplanes in warranty as of November 6, 2007. Please refer to Paragraph 2.B., Industry Support Information.
MANPOWER Elapsed HoursTotal Task HoursAirplanes
16.5519.05Group 1 Configuration 1
16.5519.05Group 1 Configuration 2
17.8018.55Group 2
15.8518.35Group 3
MATERIAL INFORMATION Boeing Supplied Kits/Parts.
Refer to Paragraph 2.A., Material - Price and Availability.
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Original Issue: November 02, 2011 737-33-1146 6 of 78 BOEING SERVICE BULLETIN 737-33-1146
BOEING SERVICE BULLETIN 737-33-1146
- INSTALL NEW POTTED
INSERT, SPACERS, AND CLAMPS -INSTALL NEW WIRE BUNDLE W7152 -INSTALL NEW BRACKET -BOND AND MEASURE
BETWEEN BRACKET AND
STIFFENER
- INSTALL NEW
HOUSING -BOND AND MEASURE
BETWEEN SURFACES
FOR THE TAILSTROBE
ASSEMBLY, TAILSTROBE
LIGHT HOUSING ASSEMBLY
AND AFT FAIRING ASSEMBLY FWD -MAKE CHANGES
TO WIRE BUNDLES W4724, W5726, AND W7150 2054541 Original Issue: November 02, 2011 737-33-1146
BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 7 of 78
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Commercial Airplanes 737 Service Bulletin
SPECIAL ATTENTION Number: 737-33-1146 Original Issue: November 02, 2011 ATA System: 3340 SUBJECT: LIGHTS - Strobe Position Lights - Lightning Protection of the Tail Strobe Light system wiring BOEING RECOMMENDS THAT EACH OPERATOR EXAMINE THIS SERVICE BULLETIN IMMEDIATELY.
1. PLANNING INFORMATION A. Effectivity
1. Airplanes Refer to Service Bulletin Index D6-19567 Part 3 for Airplane Variable Number, Line Number, and Serial Number data.
This service bulletin is for the airplane(s) shown below. An equivalent change is on subsequent production airplanes. Refer to PRR 38275-138S for data about this change.
DESCRIPTIONCONFIGURATIONGROUP All 737-600/-700/-700C/-800/-900/-900ER airplanes from line number 1 through 3060 except airplanes with effectivities YA001-YA013, YA201-YA203, YA231-YA240, YA251-YA252, YA271-YA271, YA301-YA302, YA311-YA312, YA501-YA508, YC001-YC007, YC051-YC052, YC071-YC072, YC101-YC101, YC301-YC301, YC321-YC322 and YE001-YE003.
-1 Airplanes with a non-integrated bulkhead installed at STA 1156.1 Airplanes with an integrated bulkhead installed at STA 1156.2 All 737-700/-700C/-800/-900ER airplanes from line numbers 3061 through 3469.
-2
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DESCRIPTIONCONFIGURATIONGROUP 737-600/-700/-800 airplanes with effectivities YA001-YA013, YA201-YA203, YA231-YA240, YA251-YA252, YA271-YA271, YA301-YA302, YA311-YA312, YA501-YA508, YC001-YC007, YC051-YC052, YC071-YC072, YC101-YC101, YC301-YC301, YC321-YC322 and YE001-YE003.
-3 Airplane Models:
737-600, 737-700, 737-700C, 737-800, 737-900, 737-900ER GroupVariable Number 3YA001 - YA013 1YA014 - YA099 1YA101 - YA199 3YA201 - YA203 1YA204 - YA211 1YA221 3YA231 - YA240 1YA241 - YA242 3YA251 - YA252 1YA253 - YA256 3YA271 1YA272 1YA291 3YA301 - YA302 3YA311 - YA312 1YA313 - YA314 1YA321 - YA323 1YA336 - YA345 1YA351 1YA356 - YA357 1YA366 - YA367 1YA371 - YA377 3YA501 - YA508 1YA509 - YA536
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GroupVariable Number 1YA541 - YA552 1YA571 - YA578 1YA601 - YA615 1YA621 - YA622 1YA626 - YA631 1YA635 - YA636 1YA641 - YA642 1YA645 - YA650 1YA656 - YA659 1YA666 - YA667 1YA671 - YA672 1YA681 - YA691 1YA701 - YA710 1YA721 - YA722 1YA731 - YA734 1YA751 - YA756 1YA801 - YA803 1YA809 1YA811 - YA814 1YA831 - YA835 1YA841 - YA862 1YA881 - YA882 1YA891 - YA892 1YA961 - YA978 1YB001 - YB006 1YB101 - YB132 1YB151 - YB153 1YB156 - YB158 1YB161 - YB164 1YB171 - YB172 1YB181 - YB184 1YB201 - YB208 1YB271
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GroupVariable Number 1YB276 1YB301 - YB310 1YB371 - YB392 1YB501 - YB502 1YB521 - YB526 1YB541 - YB544 1YB551 1YB561 - YB598 1YB601 - YB633 2YB634 - YB635 1YB651 1YB656 1YB671 - YB672 1YB851 - YB863 1YB871 - YB874 1YB881 - YB893 1YB901 - YB903 1YB911 1YB961 - YB974 1YB986 - YB989 2YB990 - YB996 3YC001 - YC007 1YC008 - YC030 3YC051 - YC052 1YC053 - YC070 3YC071 - YC072 1YC073 - YC084 1YC091 - YC095 3YC101 1YC102 - YC104 1YC111 - YC113 1YC121 1YC126 - YC127
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