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Commercial Airplanes MD90 Service Bulletin ALERT Number: MD90-55A016 Original Issue: December 16, 2009 Revision 1: February 17, 2010 ATA System: 5511 SUBJECT: STABILIZERS - Section, Horizontal Stabilizer Center - Inspect/Repair/Replace Horizontal Stabilizer Center Section Left and Right Rib Hinge Bearing Lugs 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BOEING PROPRIETARY, CONFIDENTIAL, AND/OR TRADE SECRET Copyright © 2009 The Boeing Company Unpublished Work - All Rights Reserved Boeing claims copyright in each page of this document only to the extent that the page contains copyrightable subject matter.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.
BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: December 16, 2009 MD90-55A016Revision 1: February 17, 2010 1 of 50
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BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: December 16, 2009 MD90-55A016Revision 1: February 17, 2010 2 of 50 BOEING SERVICE BULLETIN MD90-55A016
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Table of Contents
Revision Transmittal Sheet5
Summary7
1. PLANNING INFORMATION ........................................ 1 1 A. Effectivity ............................................... 1 1
1. Airplanes ............................................ 1 1
2. Spares Affected ........................................ 1 3 B. Concurrent Requirements ...................................... 1 3 C. Reason ................................................ 1 3 D. Description .............................................. 1 3 E. Compliance .............................................. 1 4 F. Approval ............................................... 1 6 G. Manpower .............................................. 1 6 H. Weight and Balance Changes .................................... 1 6 I. Electrical Load Data ......................................... 1 6 J. References .............................................. 1 7
1. Existing Data .......................................... 1 7
2. Data supplied with this Service Bulletin ............................ 1 7
3. Installation Drawings Used in the Preparation of this Service Bulletin ............ 1 7 K. Publications Affected ........................................ 1 7 L. Interchangeability and Intermixability of Parts ........................... 1 7
2. MATERIAL INFORMATION ........................................ 1 9 A. Material - Price and Availability ................................... 1 9 B. Industry Support Information .................................... 1 9 C. Parts Necessary For Each Airplane ................................. 1 9
1. Kits/Parts ............................................ 1 9
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 0 E. Special Tooling - Price and Availability ............................... 2 0 F. Special Tooling Necessary to do this Service Bulletin ....................... 2 0
3. ACCOMPLISHMENT INSTRUCTIONS .................................. 2 1 A. GENERAL INFORMATION ..................................... 2 1 B. WORK INSTRUCTIONS ....................................... 2 2 FIGURE 1: INSPECT HORIZONTAL STABILIZER HINGE BEARING LUGS .............. 2 4 FIGURE 2: CRACK LENGTH MEASUREMENT .............................. 2 8 FIGURE 3: BLEND OUT REPAIR ..................................... 3 1 FIGURE 4: INSPECT HORIZONTAL STABILIZER HINGE BEARING LUGS .............. 4 1 APPENDIX A: TEMPLATE/SHIELD SHOP AID ................................ 4 3
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BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: December 16, 2009 MD90-55A016Revision 1: February 17, 2010 4 of 50 BOEING SERVICE BULLETIN MD90-55A016
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Commercial Airplanes MD90 Service Bulletin ALERT Revision Transmittal SheetNumber: MD90-55A016Original Issue: December 16, 2009 Revision 1: February 17, 2010 ATA System: 5511 SUBJECT: STABILIZERS - Section, Horizontal Stabilizer Center - Inspect/Repair/Replace Horizontal Stabilizer Center Section Left and Right Rib Hinge Bearing Lugs This revision includes all pages of the service bulletin.
COMPLIANCE INFORMATION RELATED TO THIS REVISION No more work is necessary on airplanes changed in accordance with the original issue of this service bulletin.
REASON FOR REVISION This revision is sent to include inspection requirements for the hinge bearing lug on replaced horizontal stabilizer center section ribs. Added Appendix to define a template/shield shop aid that may be used at operator's option to more clearly define the blend out area on the hinge lug.
These sections were changed:
1. Changed Service Bulletin title to more clearly define work requirements.
2. In Paragraph 1.D., Description, added inspection requirement for the hinge bearing lug on replaced horizontal stabilizer center section ribs.
3. In Paragraph 1.E., Compliance, added inspection requirements and intervals for the hinge bearing lug on replaced horizontal stabilizer center section ribs.
4. In Paragraph 1.G., Manpower, changed note to include replacement of any center section rib.
5. In Paragraph 2.A., Material - Price and Availability, added parts required for center section rib replacement, and ordering information.
6. In Paragraph 2.C.1., Parts Necessary For Each Airplane, added parts required for center section rib replacement.
7. In Paragraph 3.B., Work Instructions, added inspection requirements for the hinge bearing lug on replaced horizontal stabilizer center section ribs, and added note regarding availability of locally manufactured template/shield shop aid.
8. In Figure 3, added recommended cutter information to work step 5.
9. Added Appendix A.
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Vertical lines are put on the left edge of each page, except in Paragraph 1.A., Effectivity, to show the location of important changes.
Pages with no vertical lines have no important changes.
REVISION HISTORY December 16, 2009Original Issue:
February 17, 2010Revision 1:
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Original Issue: December 16, 2009 MD90-55A016Revision 1: February 17, 2010 6 of 50 BOEING SERVICE BULLETIN MD90-55A016
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Commercial Airplanes MD90 Service Bulletin ALERT SummaryNumber: MD90-55A016Original Issue: December 16, 2009 Revision 1: February 17, 2010 ATA System: 5511 SUBJECT: STABILIZERS - Section, Horizontal Stabilizer Center - Inspect/Repair/Replace Horizontal Stabilizer Center Section Left and Right Rib Hinge Bearing Lugs
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 Boeing has received seven reports of cracks being found on either the left, right, or in one case both, of the MD-90 horizontal stabilizer center section ribs. These cracks were found on the aft face of the horizontal stabilizer hinge bearing lugs. Cracks were reported on MD-90 airplanes with between 9051 and 21,183 flight-hours and 8939 and 20,893 flight cycles. Investigation by Boeing has yet to establish the definitive cause of these cracks.
Performing an Eddy Current, High Frequency inspection of the affected area will determine the existence of any crack. If not corrected, undetected cracks in the center section left and right rib hinge bearing lugs could spread at the same time which would cause both hinge bearing lugs to fail, resulting in the horizontal stabilizer being unable to sustain the required loads.
ACTION This service bulletin gives instructions to do an Eddy Current, High Frequency inspection of the horizontal stabilizer center section left and right rib hinge bearing lugs for cracks and does as follows:
CONDITION 1 (No Crack Found in Rib Hinge Bearing Lug)
1. Repeats the Eddy Current, High Frequency inspection at defined intervals.
CONDITION 2 (Crack Found in Rib Hinge Bearing Lug)
1. Measures the crack length and do as follows:
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CONDITION 2A (Crack Length Between Points 'A' and 'B' is Less Than or Equal to 0.15 Inch, and Crack Length Between Points 'C' and 'D' is Less Than or Equal to 0.05 Inch)
a. Does blend out repair to remove crack.
b. Repetitively inspects blend out area for cracks, using Eddy Current, High Frequency inspection.
CONDITION 2B (Crack Length Between Points 'A' and 'B' is Greater Than 0.15 Inch, or Crack Length Between Points 'C' and 'D' is Greater Than 0.05 Inch)
a. Replaces horizontal stabilizer center section rib.
b. Does Eddy Current, High Frequency inspections at a defined threshold.
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.
INDUSTRY SUPPORT INFORMATION Boeing warranty remedies are not available for the inspection 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.
BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: December 16, 2009 MD90-55A016Revision 1: February 17, 2010 8 of 50 BOEING SERVICE BULLETIN MD90-55A016
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BOEING SERVICE BULLETIN MD90-55A016
ALERT ALERT
INSPECT/REPAIR/REPLACE HORIZONTAL
STABILIZER CENTER SECTION LEFT AND
RIGHT HINGE BEARING LUGS 1924662 Original Issue: December 16, 2009 Revision 1: February 17, 2010 MD90-55A016
BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 9 of 50
BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: December 16, 2009 MD90-55A016Revision 1: February 17, 2010 10 of 50 BOEING SERVICE BULLETIN MD90-55A016
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Commercial Airplanes MD90 Service Bulletin ALERT Number: MD90-55A016 Original Issue: December 16, 2009 Revision 1: February 17, 2010 ATA System: 5511 SUBJECT: STABILIZERS - Section, Horizontal Stabilizer Center - Inspect/Repair/Replace Horizontal Stabilizer Center Section Left and Right Rib Hinge Bearing Lugs
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 12018 12094 - 2100 12115 12117 12120 12122 - 2123 12125 - 2126
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GroupFuselage Number 12129 12131 12133 12136 12138 12140 - 2144 12146 - 2147 12149 - 2150 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 12242 - 2243 12245 - 2246 12248
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Original Issue: December 16, 2009 MD90-55A016Revision 1: February 17, 2010 12 of 50 BOEING SERVICE BULLETIN MD90-55A016