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Commercial Airplanes MD90 Service Bulletin ALERT Number: MD90-30A029 Original Issue: November 25, 2015 ATA System: 3031 SUBJECT: NAVIGATION - Angle of Attack Sensor - External Case Heater 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.
9E991ECCN:
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Unpublished Work.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: November 25, 2015 MD90-30A029 1 of 61
3.0
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: November 25, 2015 MD90-30A029 2 of 61 BOEING SERVICE BULLETIN MD90-30A029
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BLANK PAGE
Table of Contents
S u m m a r y5
1. PLANNING INFORMATION9
A . E f f e c t i v i t y9
1. Airplanes9
2 . S p a r e s A f f e c t e d ........................................ 1 1 B. Concurrent Requirements ...................................... 1 1 C. Reason ................................................ 1 1 D. Description .............................................. 1 2 E. Compliance .............................................. 1 2 F . A p p r o v a l ............................................... 1 2 G. Manpower .............................................. 1 3 H. Weight and Balance Changes .................................... 1 3 I. Electrical Load Data ......................................... 1 4 J . R e f e r e n c e s .............................................. 1 5
1. Existing Data: ......................................... 1 5
2. Data Supplied with this Service Bulletin: ........................... 1 5
3. Installation Drawings Used in the Preparation of this Service Bulletin: ........... 1 6 K. Publications Affected ........................................ 1 6 L. Interchangeability and Intermixability of Parts ........................... 1 6 M. Software Accomplishment Summary ................................ 1 6
2. MATERIAL INFORMATION ........................................ 1 7 A. Material - Price and Availability ................................... 1 7 B. Industry Support Information .................................... 1 7 C. Parts Necessary for Each Airplane ................................. 1 7 1 . K i t s / P a r t s ............................................ 1 7
2. Parts and Materials Supplied by the Operator ........................ 2 0
3. Parts Modified and Reidentified ................................ 2 0
4. Parts Removed and Not Replaced .............................. 2 0 D. Parts Necessary to Change Spares ................................. 2 1 E. Special Tooling - Price and Availability ............................... 2 1 F. Special Tooling Necessary to do this Service Bulletin ....................... 2 1
3. ACCOMPLISHMENT INSTRUCTIONS .................................. 2 3 A. GENERAL INFORMATION ..................................... 2 3 B. WORK INSTRUCTIONS ....................................... 2 5 FIGURE 1: FLIGHT COMPARTMENT, LEFT AND RIGHT SIDE - AOA SENSOR ENCLOSURE - DRILL [Group 1] ............................................ 2 7 FIGURE 2: FLIGHT COMPARTMENT, LEFT AND RIGHT SIDE - CLIP ASSEMBLIES - INSTALL [Group 1 ] ................................................ 3 0 FIGURE 3: FLIGHT COMPARTMENT TO STATION 110 RELAY PANEL - WIRES - WIRE ROUTING [Group 1 ] ................................................ 3 3 FIGURE 4: FLIGHT COMPARTMENT, LEFT AND RIGHT SIDE - AOA SENSOR ENCLOSURE - APPLY SEALANT [Group 1] ...................................... 4 2 FIGURE 5: AIRCRAFT EXTERIOR, LEFT AND RIGHT SIDE - AOA SENSOR EXTERNAL CASE HEATERS AND AOA SENSORS - INSTALL [Group 1] .......................... 4 5 FIGURE 6: FLIGHT COMPARTMENT TO STATION 110 RELAY PANEL - WIRES - WIRE CHANGES [Group 1] ............................................ 5 0 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: November 25, 2015 MD90-30A029 3 of 61 BOEING SERVICE BULLETIN MD90-30A029
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FIGURE 7: STATION 110 RELAY PANEL - WIRES - WIRE ROUTING [Group 2] ........... 5 2 FIGURE 8: AIRCRAFT EXTERIOR, LEFT AND RIGHT SIDE - AOA SENSOR EXTERNAL CASE HEATERS AND AOA SENSORS - INSTALL [Group 2] .......................... 5 4 FIGURE 9: FLIGHT COMPARTMENT TO STATION 110 RELAY PANEL - WIRES - WIRE CHANGES [Group 2] ............................................ 5 9 APPENDIX A: PART DEMAND INTENT ................................... 6 1 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: November 25, 2015 MD90-30A029 4 of 61 BOEING SERVICE BULLETIN MD90-30A029
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Commercial Airplanes MD90 Service Bulletin ALERT SummaryNumber: MD90-30A029Original Issue: November 25, 2015 ATA System: 3031 SUBJECT: NAVIGATION - Angle of Attack Sensor - External Case Heater Installation
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 Stall Protection System anomalies have been reported on the 717-200 related to the Angle of Attack (AOA) Sensor becoming immobilized and reporting incorrect angle of attack alpha values. Boeing investigation found potential water intrusion and subsequent ice formation between the AOA sensor vane and face plate could cause the vane to become immobilized until the airplane is operated at temperatures above freezing. The MD-90 uses the same AOA sensors as the 717 and the same potential for AOA vane immobilization exists. If this condition occurs the Stall Protection System may become unreliable or non-functional which can result in unsafe flight conditions or loss of controllability of the airplane.
Eight (8) reports from four (4) 717-200 operators identified stick shaker activation at airspeeds that were above the stall protection system's stick shaker schedule. Review of the flight data and operator reports indicate the AOA sensor vanes were exposed to moisture/water intrusion prior to and during takeoff/climb. As a result, the AOA sensor vanes may become immobilized when the Total Air Temperature (TAT) is below 0 degrees Celsius during the climb and cruise portion of flight. The consequence of this immobilization renders the Stall Protection System non-functional until the airplane operates in above 0 degree Celsius conditions. Additionally, the MD-90 Stall Protection System does not incorporate the same 717 Mach compensated stall warning system or stick shaker warning system features which under some conditions could alert the crew an AOA sensor is immobilized.
Performing this service bulletin installs AOA Sensor External Case Heaters on the Left and Right Side AOA Sensor assemblies. External Case Heaters will increase the temperature of the AOA sensor assemblies to mitigate the possibility of ice formation and subsequent system anomalies caused by AOA vane immobilization.
Boeing Fleet Team Digest (FTD) MD-90 FTD 34-09003 is 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: November 25, 2015 MD90-30A029 5 of 61
ReferenceAffectedPlanning Data Paragraph 1.A.2., Spares AffectedNoSpares Affected Paragraph 1.E., Compliance and Paragraph
1.F., Approval YesAD Related Paragraph 1.H., Weight and Balance ChangesYesWeight and Balance Change Paragraph 1.I., Electrical Load DataYesElectrical Load Changed Paragraph 1.K., Publications AffectedYesPublications Affected Paragraph 1.K., Publications AffectedYesAirplane Flight Operations Affected (Flight Crew Operations Manual and/or FAA Approved Airplane Flight Manual) Paragraph 2.C.1., Kits/PartsYesKits/Parts Required Paragraph 2.C.2., Parts and Materials Supplied by the Operator YesOperator Supplied Parts/Material Paragraph 2.F., Special Tooling Necessary to do this Service Bulletin NoSpecial Tooling Required ACTION Group 1:
Get access to Flight compartment and Electronic Equipment compartment then do the following:
– Install clip assemblies and wires.
– Install Left and Right Side AOA Sensor External Case Heaters.
– Connect wires to Left and Right Side AOA Sensor External Case Heaters.
– Do the Functional Test of the Left and Right Side AOA Sensor External Case Heaters.
Group 2:
Get access to the Electronic Equipment compartment and do the following:
– Install Left and Right Side AOA Sensor External Case Heaters.
– Connect wires to Left and Right Side AOA Sensor External Case Heaters.
– Do the Functional Test of the Left and Right Side AOA Sensor External Case Heaters.
EFFECTIVITY All MD-90-30 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 six years after the original issue date of this service bulletin.
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: November 25, 2015 MD90-30A029 6 of 61 BOEING SERVICE BULLETIN MD90-30A029
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INDUSTRY SUPPORT INFORMATION Boeing warranty remedies are not available for the configuration changes given in this service bulletin.
At the time of release of this service bulletin, warranty remedies have not been determined. A subsequent revision or Information Notice will address the warranty remedies available, if any.
MANPOWER Refer to Paragraph 1.G., Manpower
MATERIAL INFORMATION Negotiated Kits/Parts.
Refer to Paragraph 2.A., Material - Price and Availability.
Operators are encouraged to complete the survey provided in APPENDIX A of this service bulletin to help Boeing predict the quantity and timing of the Boeing Supplied Kits/Parts.
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: November 25, 2015 MD90-30A029 7 of 61 BOEING SERVICE BULLETIN MD90-30A029
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BOEING SERVICE BULLETIN MD90-30A029
ALERT ALERT GROUP 1: INSTALL AOA SENSOR EXTERNAL CASE HEATERS AND WIRING.
GROUP 2: INSTALL AOA SENSOR EXTERNAL CASE HEATERS.
2350427 Original Issue: November 25, 2015 PROPRIETARY - Copyright © Unpublished Export Controlled ECCN: 9E991 - BOEING MD90-30A029 Work - See page 1 for details. 8 of 61
Commercial Airplanes MD90 Service Bulletin ALERT Number: MD90-30A029 Original Issue: November 25, 2015 ATA System: 3031 SUBJECT: NAVIGATION - Angle of Attack Sensor - External Case Heater Installation
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.
All MD-90-30 aircraft.
DESCRIPTIONCONFIGURATIONGROUP MD-90 airplanes applicable for kit SA90300029-3.-1 MD-90 airplanes applicable for kit SA90300029-5.-2 Airplane Models:
MD-90-30 GroupFuselage Number 12018 12094 - 2099 12100 12115 12117 12120 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: November 25, 2015 MD90-30A029 9 of 61
GroupFuselage Number 12122 - 2123 12125 - 2126 12129 12131 12133 12136 12138 12140 - 2144 12146 - 2147 22149 12150 12153 - 2154 12156 - 2166 12168 - 2173 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 - 2238 12240 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: November 25, 2015 MD90-30A029 10 of 61 BOEING SERVICE BULLETIN MD90-30A029
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GroupFuselage Number 12242 - 2243 12245 - 2246 12248 12250 - 2251 12253 12255 - 2263 12288 - 2290 14001 - 4002
2. Spares Affected None.
B. Concurrent Requirements None.
C. Reason Stall Protection System anomalies have been reported on the 717-200 related to the Angle of Attack (AOA) Sensor becoming immobilized and reporting incorrect angle of attack alpha values. Boeing investigation found potential water intrusion and subsequent ice formation between the AOA sensor vane and face plate could cause the vane to become immobilized until the airplane is operated at temperatures above freezing. The MD-90 uses the same AOA sensors as the 717 and the same potential for AOA vane immobilization exists. If this condition occurs the Stall Protection System may become unreliable or non-functional which can result in unsafe flight conditions or loss of controllability of the airplane.
Eight (8) reports from four (4) 717-200 operators identified stick shaker activation at airspeeds that were above the stall protection system's stick shaker schedule. Review of the flight data and operator reports indicate the AOA sensor vanes were exposed to moisture/water intrusion prior to and during takeoff/climb. As a result, the AOA sensor vanes may become immobilized when the Total Air Temperature (TAT) is below 0 degrees Celsius during the climb and cruise portion of flight. The consequence of this immobilization renders the Stall Protection System non-functional until the airplane operates in above 0 degree Celsius conditions. Additionally, the MD-90 Stall Protection System does not incorporate the same 717 Mach compensated stall warning system or stick shaker warning system features which under some conditions could alert the crew an AOA sensor is immobilized.
Performing this service bulletin installs AOA Sensor External Case Heaters on the Left and Right Side AOA Sensor assemblies. External Case Heaters will increase the temperature of the AOA sensor assemblies to mitigate the possibility of ice formation and subsequent system anomalies caused by AOA vane immobilization.
Boeing Fleet Team Digest (FTD) MD-90 FTD 34-09003 is related to this service bulletin.
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: November 25, 2015 MD90-30A029 11 of 61 BOEING SERVICE BULLETIN MD90-30A029
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D. Description Group 1:
Get access to Flight compartment and Electronic Equipment compartment then do the following:
– Install clip assemblies and wires.
– Install Left and Right Side AOA Sensor External Case Heaters.
– Connect wires to Left and Right Side AOA Sensor External Case Heaters.
– Do the Functional Test of the Left and Right Side AOA Sensor External Case Heaters.
Group 2:
Get access to the Electronic Equipment compartment and do the following:
– Install Left and Right Side AOA Sensor External Case Heaters.
– Connect wires to Left and Right Side AOA Sensor External Case Heaters.
– Do the Functional Test of the Left and Right Side AOA Sensor External Case Heaters.
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 change given in this service bulletin be done within six years 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.
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: November 25, 2015 MD90-30A029 12 of 61 BOEING SERVICE BULLETIN MD90-30A029