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Commercial Airplanes MD90 Service Bulletin ALERT Number: MD90-74A002 Original Issue: August 17, 2010 ATA System: 7400 SUBJECT: ENGINE IGNITION - Ignition - Change Fire Handle Shutoff System Wire Routing 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BOEING PROPRIETARY, CONFIDENTIAL, AND/OR TRADE SECRET Copyright © 2010 The Boeing Company Unpublished Work - All Rights Reserved Boeing claims copyright in each page of this document only to the extent that the page contains copyrightable subject matter.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.
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Original Issue: August 17, 2010 MD90-74A002 1 of 21
4.0
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Original Issue: August 17, 2010 MD90-74A002 2 of 21 BOEING SERVICE BULLETIN MD90-74A002
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Table of Contents
Summary5
1. PLANNING INFORMATION9
A. Effectivity9
1. Airplanes9
2. Spares Affected ........................................ 1 1 B. Concurrent Requirements ...................................... 1 1 C. Reason ................................................ 1 1 D. Description .............................................. 1 1 E. Compliance .............................................. 1 1 F. Approval ............................................... 1 2 G. Manpower .............................................. 1 2 H. Weight and Balance Changes .................................... 1 2 I. Electrical Load Data ......................................... 1 2 J. References .............................................. 1 3
1. Existing Data: ......................................... 1 3
2. Data supplied with this Service Bulletin: ........................... 1 3
3. Installation Drawings Used in the Preparation of this Service Bulletin: ........... 1 3 K. Publications Affected ........................................ 1 3 L. Interchangeability and Intermixability of Parts ........................... 1 4
2. MATERIAL INFORMATION ........................................ 1 5 A. Material - Price and Availability ................................... 1 5 B. Industry Support Information .................................... 1 5 C. Parts Necessary For Each Airplane ................................. 1 5
1. Kits/Parts: ........................................... 1 5
2. Parts and Materials Supplied by the Operator: ........................ 1 6
3. Parts Modified and Reidentified: ............................... 1 7
4. Parts Removed and Not Replaced: .............................. 1 7 D. Parts Necessary to Change Spares ................................. 1 7 E. Special Tooling - Price and Availability ............................... 1 7 F. Special Tooling Necessary to do this Service Bulletin ....................... 1 7
3. ACCOMPLISHMENT INSTRUCTIONS .................................. 1 9 A. GENERAL INFORMATION ..................................... 1 9 B. WORK INSTRUCTIONS ....................................... 2 0
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Commercial Airplanes MD90 Service Bulletin ALERT SummaryNumber: MD90-74A002Original Issue: August 17, 2010 ATA System: 7400 SUBJECT: ENGINE IGNITION - Ignition - Change Fire Handle Shutoff System Wire Routing
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 The engine fire shutoff handles on the MD-90 airplanes are designed to shutoff fuel at both the wing spar's mechanical fuel fire shutoff valve as well as the electrical solenoid controlled engine fuel shutoff valve in the engine Hydromechanical Unit (HMU). The feature is unique to the MD-90 airplanes and would result in an automatic shutoff of the fuel at the engine HMU when the affected fire handle is pulled. Due to the lack of separation between engine wires, a latent failure in the fire handle fuel shutoff relay circuit has the potential of causing a dual engine shutdown in the event any single engine fuel fire shutoff handle is actuated. Separating the fire handle shutoff system wiring will minimize the possibility of multiple engine shutdown due to single event.
If not corrected, inadequate separation has the potential of causing a dual engine shutdown in the event any single engine fuel fire shutoff handle is activated.
ACTION This service bulletin provides instructions for operators to change the wire routing for the fire handle shutoff system.
EFFECTIVITY MD-90-30 Airplanes. Refer to Paragraph 1.A.1., Airplanes for the list of affected airplanes.
COMPLIANCE The Federal Aviation Administration (FAA) will possibly release an Airworthiness Directive related to this service bulletin. The Airworthiness Directive will make the compliance tasks and times given in this service bulletin mandatory.
Boeing recommends that the wire routing change for the fire handle shutoff system be done within 4,200 flight-hours after the original issue date on this service bulletin.
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Original Issue: August 17, 2010 MD90-74A002 5 of 21
INDUSTRY SUPPORT INFORMATION Boeing warranty remedies are not available for the configuration changes given in this service bulletin.
MANPOWER Elapsed HoursTotal Task HoursAirplanes
7.97.9MD-90-30
MATERIAL INFORMATION Boeing supplied Parts/Materials.
Refer to Paragraph 2.A., Material - Price and Availability.
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BOEING SERVICE BULLETIN MD90-74A002
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CHANGE FIRE HANDLE SHUTOFF SYSTEM WIRE ROUTING 1920012 Original Issue: August 17, 2010 MD90-74A002
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Original Issue: August 17, 2010 MD90-74A002 8 of 21 BOEING SERVICE BULLETIN MD90-74A002
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Commercial Airplanes MD90 Service Bulletin ALERT Number: MD90-74A002 Original Issue: August 17, 2010 ATA System: 7400 SUBJECT: ENGINE IGNITION - Ignition - Change Fire Handle Shutoff System Wire Routing
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 for the airplanes shown below:
DESCRIPTIONCONFIGURATIONGROUP Change Fire Handle Shutoff System Wire Routing-1 Airplane Models:
MD-90-30 GroupFuselage Number 12094 - 2100 12115 12117 12120 12122 - 2123 12125 - 2126 12129 12131 12133
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GroupFuselage Number 12136 12138 12140 - 2144 12146 - 2147 12149 - 2150 12153 - 2154 12156 - 2159 12161 - 2166 12169 - 2171 12173 12175 12177 12179 12181 - 2182 12184 12186 12190 - 2191 12193 - 2195 12197 - 2198 12200 12202 - 2203 12205 12207 12209 - 2213 12215 - 2217 12219 - 2233 12235 - 2237 12240 12243 12245 12248 12250 - 2251
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GroupFuselage Number 12253 12255 - 2263 12288 - 2290 14001 - 4002
2. Spares Affected None.
B. Concurrent Requirements None.
C. Reason The engine fire shutoff handles on the MD-90 airplanes are designed to shutoff fuel at both the wing spar's mechanical fuel fire shutoff valve as well as the electrical solenoid controlled engine fuel shutoff valve in the engine Hydromechanical Unit (HMU). The feature is unique to the MD-90 airplanes and would result in an automatic shutoff of the fuel at the engine HMU when the affected fire handle is pulled. Due to the lack of separation between engine wires, a latent failure in the fire handle fuel shutoff relay circuit has the potential of causing a dual engine shutdown in the event any single engine fuel fire shutoff handle is actuated. Separating the fire handle shutoff system wiring will minimize the possibility of multiple engine shutdown due to single event. If not corrected, inadequate separation has the potential of causing a dual engine shutdown in the event any single engine fuel fire shutoff handle is activated.
D. Description This service bulletin provides instructions for operators to change the wire routing for the fire handle shutoff system.
The work in this service bulletin is done in the maintenance zone(s) given below.
Affected Maintenance Zones ZoneModel 114, 211MD-90-30 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 wire routing change for the fire handle shutoff system be done within 4,200 flight-hours after the original issue date on this service bulletin.
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Original Issue: August 17, 2010 MD90-74A002 11 of 21 BOEING SERVICE BULLETIN MD90-74A002
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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 inspection/modification for each airplane. This estimate is for direct labor only, done by an experienced crew. Adjust the estimate with operator task hour data if necessary. The estimate does not include lost time. These are some examples of lost time:
Time to adjust to the workplace Time to schedule the work Time to inspect the work Time to cure the materials Time to make the parts Time to find the tools.
Elapsed HoursTask HoursNumber of PersonsTask
0.20.21Open Circuit Breaker
0.50.51Open Access
6.56.51Change and Coil/Stow Wires
0.20.21Close Circuit Breaker
0.50.51Close Access
7.97.9TOTAL FOR EACH AIRPLANE H. Weight and Balance Changes Moment Change (MEW) IN.-LBS Mfr's Empty Weight (MEW) LBS Approximate Station (Inches)Airplane + 84.0+ 0.6+ 140.0MD-90-30 I. Electrical Load Data Not changed.
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