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Commercial Airplanes MD90 Service Bulletin ALERT Number: MD90-55A015 Original Issue: July 16, 2010 ATA System: 5510 SUBJECT: STABILIZERS - Horizontal Stabilizer - Inspect/Replace Upper Center Skin Panels 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BOEING PROPRIETARY, CONFIDENTIAL, AND/OR TRADE SECRET Copyright © 2010 The Boeing Company Unpublished Work - All Rights Reserved Boeing claims copyright in each page of this document only to the extent that the page contains copyrightable subject matter.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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3.0
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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 2 F. Approval ............................................... 1 6 G. Manpower .............................................. 1 7 H. Weight and Balance Changes .................................... 1 8 I. Electrical Load Data ......................................... 1 8 J. References .............................................. 1 8
1. Existing Data: ......................................... 1 8
2. Data supplied with this Service Bulletin: ........................... 1 8
3. Installation Drawings Used in the Preparation of this Service Bulletin: ........... 1 8 K. Publications Affected ........................................ 1 8 L. Interchangeability and Intermixability of Parts ........................... 1 9
2. MATERIAL INFORMATION ........................................ 2 1 A. Material - Price and Availability ................................... 2 1 B. Industry Support Information .................................... 2 1 C. Parts Necessary For Each Airplane ................................. 2 1
1. Kits/Parts: ........................................... 2 1
2. Parts and Materials Supplied by the Operator: ........................ 2 3
3. Parts Modified and Reidentified: ............................... 2 3
4. Parts Removed and Not Replaced: .............................. 2 4 D. Parts Necessary to Change Spares ................................. 2 4 E. Special Tooling - Price and Availability ............................... 2 4 F. Special Tooling Necessary to do this Service Bulletin ....................... 2 4
3. ACCOMPLISHMENT INSTRUCTIONS .................................. 2 5 A. GENERAL INFORMATION ..................................... 2 5 B. WORK INSTRUCTIONS ....................................... 2 6 FIGURE 1: HORIZONTAL STABILIZER LEFT AND RIGHT UPPER CENTER SKIN PANELS - EDDY CURRENT INSPECTION ................................... 2 8
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Commercial Airplanes MD90 Service Bulletin ALERT SummaryNumber: MD90-55A015Original Issue: July 16, 2010 ATA System: 5510 SUBJECT: STABILIZERS - Horizontal Stabilizer - Inspect/Replace Upper Center Skin Panels
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 During inspection of the horizontal stabilizer upper aft skin panel of an MD-80 airplane in accordance with Service Bulletin MD80-55A065, one operator reported finding a crack in the right horizontal stabilizer upper center skin panel at the aft inboard corner. The MD-80 airplane had accumulated 47,146 flight-hours and 26,490 flight cycles when the crack was found. The cause of the horizontal stabilizer upper center skin panel cracking on the MD-80 airplane is suspected to be fatigue. The MD-90 horizontal stabilizer is similar in design and loading as that of the MD-80 horizontal stabilizer. Boeing issued Service Bulletin MD90-55A012 which provides instructions to do inspection of the horizontal stabilizer upper aft skin panel. If undetected, a crack in the upper center skin panel may transfer load to the upper aft skin panel. This may result in the upper aft skin panel cracking faster than the existing inspection intervals, defined in Service Bulletin MD90-55A012, will detect. Inspection of the affected areas will determine the condition of the horizontal stabilizer upper center skin panels. If not corrected, undetected cracks may ultimately lead to the loss of overall structural integrity of the horizontal stabilizer.
ACTION Refer to Paragraph 1.D., Description.
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.
Refer to Paragraph 1.E., Compliance.
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INDUSTRY SUPPORT INFORMATION Boeing warranty remedies are not available for the inspection and/or repair procedures given in this service bulletin.
MANPOWER Refer to Paragraph 1.G., Manpower.
MATERIAL INFORMATION Boeing Supplied Kits/Parts.
Refer to Paragraph 2.A., Material - Price and Availability.
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BOEING SERVICE BULLETIN MD90-55A015
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INSPECT/REPLACE UPPER
CENTER SKIN PANELS 1974629 Original Issue: July 16, 2010 MD90-55A015 Copyright © Unpublished Work - See page 1 for details. BOEING PROPRIETARY - 7 of 32
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Commercial Airplanes MD90 Service Bulletin ALERT Number: MD90-55A015 Original Issue: July 16, 2010 ATA System: 5510 SUBJECT: STABILIZERS - Horizontal Stabilizer - Inspect/Replace Upper Center Skin Panels
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 MD-90-30 Airplanes-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 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 During inspection of the horizontal stabilizer upper aft skin panel of an MD-80 airplane in accordance with Service Bulletin MD80-55A065, one operator reported finding a crack in the right horizontal stabilizer upper center skin panel at the aft inboard corner. The MD-80 airplane had accumulated 47,146 flight-hours and 26,490 flight cycles when the crack was found. The cause of the horizontal stabilizer upper center skin panel cracking on the MD-80 airplane is suspected to be fatigue. The MD-90 horizontal stabilizer is similar in design and loading as that of the MD-80 horizontal stabilizer. Boeing issued Service Bulletin MD90-55A012 which provides instructions to do inspection of the horizontal stabilizer upper aft skin panel. If undetected, a crack in the upper center skin panel may transfer load to the upper aft skin panel. This may result in the upper aft skin panel cracking faster than the existing inspection intervals, defined in Service Bulletin MD90-55A012, will detect. Inspection of the affected areas will determine the condition of the horizontal stabilizer upper center skin panels. If not corrected, undetected cracks may ultimately lead to the loss of overall structural integrity of the horizontal stabilizer.
D. Description This service bulletin provides instructions to do an eddy current inspection of the horizontal stabilizer left and right upper center skin panels for cracks, and based on inspection results for each panel, does as follows:
Condition 1 (No Crack Found)
1. Does repetitive eddy current inspections of the horizontal stabilizer upper center skin panel.
Condition 2 (Crack Found)
1. OPTION 1:
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a. Replaces the cracked horizontal stabilizer upper center skin panel.
b. Does repetitive eddy current inspection of the replacement horizontal stabilizer upper center skin panel.
2. OPTION 2:
a. Contacts Boeing for possible temporary repair of crack and does the repair in accordance with Boeing's instructions.
The work in this service bulletin is done in the maintenance zone(s) given below.
Affected Maintenance Zones ZoneModel 333, 343MD-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.
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