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Commercial Airplanes MD90 Service Bulletin ALERT Number: MD90-57A030 Original Issue: February 14, 2012 ATA System: 5710 SUBJECT: WINGS - Main Frame - Inspect/Repair Stringer 11 at the Outboard Flap, Inboard Drive Hinge at Station Xrs=164.000 Left and Right Wings 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BOEING PROPRIETARY, CONFIDENTIAL, AND/OR TRADE SECRET Copyright © 2012 The Boeing Company Unpublished Work - All Rights Reserved Boeing claims copyright in each page of this document only to the extent that the page contains copyrightable subject matter.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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2.0
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Table of Contents
Summary5
1. PLANNING INFORMATION7
A. Effectivity7
1. Airplanes7
2. Spares Affected9
B. Concurrent Requirements9
C. Reason9
D. Description9
E. Compliance .............................................. 1 0 F. Approval ............................................... 1 1 G. Manpower .............................................. 1 1 H. Weight and Balance Changes .................................... 1 2 I. Electrical Load Data ......................................... 1 2 J. References .............................................. 1 2
1. Existing Data: ......................................... 1 2
2. Data supplied with this Service Bulletin: ........................... 1 2
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 3
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 7
3. Parts Modified and Reidentified: ............................... 1 8
4. Parts Removed and Not Replaced: .............................. 1 8 D. Parts Necessary to Change Spares ................................. 1 8 E. Special Tooling - Price and Availability ............................... 1 8 F. Special Tooling Necessary to do this Service Bulletin ....................... 1 8
3. ACCOMPLISHMENT INSTRUCTIONS .................................. 1 9 A. GENERAL INFORMATION ..................................... 1 9 B. WORK INSTRUCTIONS ....................................... 2 0 FIGURE 1: STRINGER 11 AT THE OUTBOARD FLAP, INBOARD DRIVE HINGE AT STATION XRS=164.000 - EDDY CURRENT, HIGH FREQUENCY INSPECTION ........... 2 2
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Commercial Airplanes MD90 Service Bulletin ALERT SummaryNumber: MD90-57A030Original Issue: February 14, 2012 ATA System: 5710 SUBJECT: WINGS - Main Frame - Inspect/Repair Stringer 11 at the Outboard Flap, Inboard Drive Hinge at Station Xrs=164.000 Left and Right Wings
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 Three MD-80 operators reported four instances of cracks found in Stringer 11 at the outboard flap, inboard drive hinge at Station Xrs=164.000. The cracking occurs at the end fastener of the wing bulkhead clip attachment to the stringer. The cracked stringers were found by chance, during maintenance, except in one case when the rear spar cap had been removed during a spar cap splice repair. No cracks have been reported by MD-90 operators. The MD-90 however shares the same structure design as that of the MD-80 and is thus susceptible to cracking. Boeing investigation and analysis have shown that the Stringer 11 cracking is due to fatigue. If undetected, a crack in the stringer may grow until the stringer severs, initiating a crack in the wing lower skin.
Continuing damage into the wing skin may result in the wing structure not being capable of sustaining the required loads. Inspection of the affected areas will determine the condition of the stringer, prevent any crack migration, and ensure repairs are done before additional damage occurs. A splice repair for crack found on the affected stringer can be accomplished by installing a segment of stringer. If not corrected, fuel leaks and damage to the wing skin or other structure may occur, resulting in possible loss of the structural integrity of the wing.
Boeing Fleet Team Digest (FTD) MD-90 FTD MD-90-FTD-57-11001 is related to this service bulletin.
ACTION This service bulletin provides instructions to do an Eddy Current, High Frequency (ETHF) inspection for cracks in Stringer 11 at the outboard flap, inboard drive hinge at Station Xrs=164.000 left and right wings. Refer to Paragraph 1.D., Description, for the required corrective action based on the results of the inspection.
EFFECTIVITY MD-90-30 Airplanes. Refer to Paragraph 1.A.1., Airplanes, for the list of affected airplanes.
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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 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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Original Issue: February 14, 2012 MD90-57A030 6 of 23 BOEING SERVICE BULLETIN MD90-57A030
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Commercial Airplanes MD90 Service Bulletin ALERT Number: MD90-57A030 Original Issue: February 14, 2012 ATA System: 5710 SUBJECT: WINGS - Main Frame - Inspect/Repair Stringer 11 at the Outboard Flap, Inboard Drive Hinge at Station Xrs=164.000 Left and Right Wings
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 Inspect/Repair Stringer 11 at the Outboard Flap, Inboard Drive Hinge at Station Xrs=164.000 left and right wings.
-1 Airplane Models:
MD-90-30 GroupFuselage Number 12094 - 2100 12115 12117 12120 12122 - 2123 12125 - 2126 12129
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GroupFuselage Number 12131 12133 12136 12138 12140 - 2144 12146 - 2147 12149 - 2150 12153 - 2154 12156 - 2159 12161 - 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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GroupFuselage Number 12250 - 2251 12253 12255 - 2263 12288 - 2290
2. Spares Affected None.
B. Concurrent Requirements None.
C. Reason Three MD-80 operators reported four instances of cracks found in Stringer 11 at the outboard flap, inboard drive hinge at Station Xrs=164.000. The cracking occurs at the end fastener of the wing bulkhead clip attachment to the stringer. The cracked stringers were found by chance, during maintenance, except in one case when the rear spar cap had been removed during a spar cap splice repair. No cracks have been reported by MD-90 operators. The MD-90 however shares the same structure design as that of the MD-80 and is thus susceptible to cracking. Boeing investigation and analysis have shown that the Stringer 11 cracking is due to fatigue. If undetected, a crack in the stringer may grow until the stringer severs, initiating a crack in the wing lower skin. Continuing damage into the wing skin may result in the wing structure not being capable of sustaining the required loads. Inspection of the affected areas will determine the condition of the stringer, prevent any crack migration, and ensure repairs are done before additional damage occurs. A splice repair for crack found on the affected stringer can be accomplished by installing a segment of stringer. If not corrected, fuel leaks and damage to the wing skin or other structure may occur, resulting in possible loss of the structural integrity of the wing.
Boeing Fleet Team Digest (FTD) MD-90 FTD MD-90-FTD-57-11001 is related to this service bulletin.
D. Description This service bulletin provides instructions to do an Eddy Current, High Frequency (ETHF) inspection for cracks in Stringer 11 at the outboard flap, inboard drive hinge at Station Xrs=164.000 left and right wings, and based on inspection results does as follows:
Condition 1 (No Crack Found)
1. Does repeat ETHF inspection for cracks in Stringer 11 at the outboard flap, inboard drive hinge at Station Xrs=164.000.
Condition 2 (Crack Found)
1. Does splice repair.
2. Does ETHF inspection for cracks in Stringer 11 at the outboard flap, inboard drive hinge at Station Xrs=164.000.
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The work in this service bulletin is done in the maintenance zone(s) given below.
Affected Maintenance Zones ZoneModel 531, 631MD-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.
Accomplish the required actions, based on the applicable conditions, in Table 1, in accordance with Paragraph 3. Accomplishment Instructions.
Table 1: Inspect Stringer 11 for Crack at the Outboard Flap, Inboard Drive Hinge at Station Xrs=164.000 left and right wings.
Repeat Interval (Not to Exceed) Compliance Time (Whichever Occurs Later) ActionCondition -Within 9,470 flight cycles after the original issue date on this service bulletin.
Before the accumulation of 14,000 total flight cycles.
Do Eddy Current, High Frequency (ETHF) inspection for cracks in Stringer 11 at the outboard flap, inboard drive hinge at Station Xrs=164.000.
All airplanes 31,000 flight cycles.
--Do ETHF inspection for cracks in Stringer 11 at the outboard flap, inboard drive hinge at Station Xrs=164.000. (a) Condition 1:
(No Crack Found) --Before further flight.Do splice repair.Condition 2:
(Crack Found) AND 31,000 flight cycles.
-42,000 flight cycles after splice repair.
Do ETHF inspection for cracks in Stringer 11 at the outboard flap, inboard drive hinge at Station Xrs=164.000. (b)
(a) If any crack is found, do the actions specified by Condition 2.
(b) If any crack is found, contact The Boeing Company for repair instructions and do the repair.
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Original Issue: February 14, 2012 MD90-57A030 10 of 23 BOEING SERVICE BULLETIN MD90-57A030
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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 the inspection/repair for each wing. 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 examine the work — Time to cure the materials — Time to make the parts — Time to find the tools.
— Time to make reference standards.
Condition 1 (No Crack Found) Elapsed HoursTask HoursNumber of PersonsTask
4.04.01Defuel Tank
8.08.01Purge Tank
1.01.01FIGURE 1
13.013.0TOTAL FOR EACH WING Condition 2 (Crack Found) Elapsed HoursTask HoursNumber of PersonsTask
4.04.01Defuel Tank
8.08.01Purge Tank
1.01.01FIGURE 1
40.080.02Splice Repair
53.093.0TOTAL FOR EACH WING
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H. Weight and Balance Changes Condition 1 (No Crack Found) None.
Condition 2 (Crack Found) Moment Change (MEW) IN.-LBS Mfr's Empty Weight (MEW) LBS Approximate Station (Inches)Airplane + 7562.8+ 7.4+ 1022.0MD-90-30 (Left Wing Only) + 7562.8+ 7.4+ 1022.0MD-90-30 (Right Wing Only) + 15525.6+ 14.8+ 1022.0MD-90-30 (Both Wings) I. Electrical Load Data Not changed.
J. References
1. Existing Data:
a. Non-Destructive Test Standard Practices Manual (NDTSPM) 06-10-01.001.
b. MD-90 Aircraft Maintenance Manual (AMM) 06-35-00, 06-36-00, 12-11-01, 28-00-00, 28-10-01.
c. MD-90 Fleet Team Digest (FTD) MD-90-FTD-57-11001.
d. MD-90 Structural Repair Manual (SRM) 51, 51-10-09 Volume II
2. Data supplied with this Service Bulletin:
No data is supplied with this service bulletin. To obtain the data necessary to support this service bulletin submit a data request to:
Data and Services Management MS D800-0019 3855 Lakewood Boulevard Long Beach, California 90846 Phone: (562) 593-6996 Fax: (562) 593-2001 E-mail: dse.boecom@boeing.com
a. Drawings:
ADCNDCN/REVSheetTitleDrawing No --DWGSTRG 11 REPAIR, LWR WING, XRS
164.000 SR90570009
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