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Commercial Airplanes 707 Service Bulletin ALERT Number: A3537 Original Issue: January 30, 2012 ATA System: 5410 SUBJECT: NACELLE - Inboard and Outboard Nacelle Strut Midspar Fitting - Inspection 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BOEING PROPRIETARY, CONFIDENTIAL, AND/OR TRADE SECRET Copyright © 2012 The Boeing Company Unpublished Work - All Rights Reserved Boeing claims copyright in each page of this document only to the extent that the page contains copyrightable subject matter.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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Table of Contents
Summary5
1. PLANNING INFORMATION9
A. Effectivity9
1. Airplanes9
2. Spares Affected ........................................ 1 3 B. Concurrent Requirements ...................................... 1 3 C. Reason ................................................ 1 3 D. Description .............................................. 1 4 E. Compliance .............................................. 1 4 F. Approval ............................................... 1 6 G. Manpower .............................................. 1 7 H. Weight and Balance Changes .................................... 1 7 I. Electrical Load Data ......................................... 1 7 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 8 K. Publications Affected ........................................ 1 8 L. Interchangeability and Intermixability of Parts ........................... 1 8
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 ........................ 1 9
3. Parts Modified and Reidentified ................................ 1 9
4. Parts Removed and Not Replaced .............................. 1 9 D. Parts Necessary to Change Spares ................................. 1 9 E. Special Tooling - Price and Availability ............................... 1 9 F. Special Tooling Necessary to do this Service Bulletin ....................... 1 9
3. ACCOMPLISHMENT INSTRUCTIONS .................................. 2 1 A. GENERAL INFORMATION ..................................... 2 1 B. WORK INSTRUCTIONS ....................................... 2 2 FIGURE 1: NACELLE STRUT AND SAILBOAT FAIRING DROOP STRIPE APPLICATION ...... 2 4 FIGURE 2: NACELLE STRUT DROOP .................................. 2 6 FIGURE 3: ENGINE NUMBER 2 AND ENGINE NUMBER 3 NACELLE STRUT MIDSPAR FITTING INSPECTION .......................................... 2 8 FIGURE 4: ENGINE NUMBER 2 AND ENGINE NUMBER 3 NACELLE STRUT MIDSPAR FITTINGS HFEC INSPECTION .......................................... 3 1 FIGURE 5: ENGINE NUMBER 2 AND ENGINE NUMBER 3 NACELLE STRUT FAIRING AND PANEL INSTALLATION ......................................... 3 5
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Commercial Airplanes 707 Service Bulletin ALERT SummaryNumber: A3537Original Issue: January 30, 2012 ATA System: 5410 SUBJECT: NACELLE - Inboard and Outboard Nacelle Strut Midspar Fitting - Inspection
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 Accomplishment of the inspections in this service bulletin will make sure that an engine number 1, 2, 3, or 4 nacelle strut has not drooped from its normal position and that the correct inboard and outboard midspar fittings are installed on the engine number 2 and 3 nacelle struts. A drooped nacelle strut indicates that a midspar fitting may have fractured. If an incorrect midspar fitting is installed, a fatigue crack can occur which can cause a fracture of a midspar fitting. A fractured midspar fitting can result in a separation of the nacelle strut and engine from the airplane in flight which could preclude safe flight.
Operators have reported more than 45 of the midspar fittings with the 0.38 inch tang transition, cracked on more than 40 airplanes with approximately 9,900 to 63,000 flight hours. There have been several events where the engine and nacelle strut has separated from the airplane. In one instance, the engine number 3 nacelle strut separated from the airplane and contacted the engine number 4 nacelle strut, which also separated from the airplane.
This service bulletin gives instructions to inspect for the correct engine number 2 and 3 nacelle strut midspar fittings, apply a droop stripe and inspect the engine number 1, 2, 3, and 4 nacelle strut for droop.
Boeing Service Related Problem (SRP) 707-SRP-54-0105 is related to this service bulletin.
This table is provided to operators for planning purposes only. Refer to the applicable sections for more information.
ReferenceAffectedPlanning Data Paragraph 1.A.2., Spares AffectedNoSpares Affected Paragraph 1.E., ComplianceYesAD Related Paragraph 1.H., Weight and Balance ChangesNoWeight and Balance Change
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ReferenceAffectedPlanning Data Paragraph 1.I., Electrical Load DataNoElectrical Load Changed Paragraph 1.K., Publications AffectedNoPublications Affected Paragraph 1.K., Publications AffectedNoAirplane Flight Operations Affected (Flight Crew Operations Manual and/or FAA Approved Airplane Flight Manual) Paragraph 2.C.1., Kits/PartsNoKits/Parts Required Paragraph 2.C.2., Parts and Materials Supplied by the Operator YesOperator Supplied Material Paragraph 2.F., Special Tooling Necessary to do this Service Bulletin NoSpecial Tooling Required ACTION Do a general visual inspection of the engine number 1, 2, 3, and 4 nacelle struts for droop below the normal position. Make sure each nacelle strut has not drooped from its normal position. Apply a stripe to the inboard and outboard side of the engine number 1, 2, 3, and 4 nacelle strut if it has not been previously accomplished.
If a nacelle strut is drooped below its normal position contact Boeing for further instructions and do the work as instructed by Boeing.
Do a detailed inspection of the engine number 2 and engine number 3 nacelle strut inboard and outboard midspar fittings to confirm the correct part is installed. If an incorrect part is found replace the part in accordance with Boeing service bulletin 707-3183.
Do a HFEC inspection of the engine number 2 and engine number 3 nacelle strut inboard and outboard midspar fittings, to look for cracks. If a crack indication is found contact Boeing for further instructions and do the work as instructed by Boeing.
NOTE: You do not need to change the existing droop stripe, if the droop stripe was applied in accordance with Boeing service bulletin 707-3377 requirements.
EFFECTIVITY 707-100, -100B, -200, -300, -300B, -300C, -400, 720, 720B 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.
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.
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MANPOWER Elapsed HoursTotal Task HoursAirplanes
9.0018.00All Airplanes
MATERIAL INFORMATION None.
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BOEING SERVICE BULLETIN A3537
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NACELLE STRUT #3 DO A GENERAL VISUAL INSPECTION OF
NACELLE THE NACELLE STRUT TO MAKE SURE IT STRUT #4 IS NOT DROOPED BELOW ITS NORMAL POSITION AND APPLY STRIPE.
MAKE SURE THE NACELLE HAS NOT
DROOPED BELOW ITS NORMAL POSITION.
→ D
NACELLE NACELLE STRUT #1 STRUT #2
DO A ONE TIME DETAILED INSPECTION OF THE NUMBER 2 AND NUMBER 3
NACELLE STRUT MID SPAR FITTINGS
FOR CORRECT PART, AND HFEC
INSPECTION FOR CRACKS 2110700 Original Issue: January 30, 2012 A3537
BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 8 of 36
Commercial Airplanes 707 Service Bulletin ALERT Number: A3537 Original Issue: January 30, 2012 ATA System: 5410 SUBJECT: NACELLE - Inboard and Outboard Nacelle Strut Midspar Fitting - Inspection
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 airplane(s) shown below.
Refer to Service Bulletin Index D6-1647 Part 3 for Airplane Variable Number, Line Number, and Serial Number data.
DESCRIPTIONCONFIGURATIONGROUP 707-100, 707-100B, 707-200, 707-300, 707-300B, 707-300C, 707-400, 720, 720B Airplanes.
-1 Airplane Models:
707-100, 707-100B, 707-200, 707-300, 707-300B, 707-300C, 707-400, 720, 720B GroupVariable Number 1B0001 - B0029 1B0101 - B0125 1B0201 - B0203 1B0301 - B0306 1B0401 - B0402 1B0501 - B0515
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GroupVariable Number 1B2001 - B2008 1B2091 - B2092 1B2101 - B2116 1B2191 - B2194 1B2199 1B2201 - B2227 1B2401 - B2403 1B2501 - B2502 1B2551 - B2553 1B2601 - B2608 100001 - 00006 100101 - 00156 100201 - 00205 100301 - 00305 100401 - 00451 100471 - 00475 100501 - 00513 100601 - 00602 100701 - 00703 102001 - 02020 102101 - 02121 102201 - 02207 102301 - 02303 102401 - 02418 104001 - 04005 104020 - 04022 104101 - 04106 104201 - 04218 104271 - 04272 104301 - 04303 105001 - 05060 105101 - 05138 105201 - 05208
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GroupVariable Number 105301 - 05312 105401 105601 - 05605 105631 - 05635 105701 - 05703 105801 - 05802 105821 - 05827 105831 - 05833 105851 - 05854 105891 - 05892 105921 - 05923 105941 - 05942 105961 - 05970 106001 - 06002 106101 106401 - 06404 106451 106461 107001 - 07017 107041 - 07059 107071 - 07081 107101 - 07109 107181 107191 107201 - 07215 107251 - 07271 107401 - 07407 107451 - 07458 107501 - 07504 107601 - 07626 107661 - 07662 107681 - 07684 107701 - 07702
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GroupVariable Number 107801 - 07821 107901 - 07907 108001 - 08008 108021 108051 - 08056 108071 - 08077 108101 - 08104 108121 - 08129 108141 - 08144 108151 - 08153 108171 - 08173 108191 - 08192 108201 - 08210 108221 - 08224 108241 - 08244 108251 108261 108271 108301 - 08320 108324 - 08330 108333 108401 - 08410 108451 - 08452 108471 - 08475 108501 - 08502 108551 - 08553 108581 - 08582 109001 - 09006 109101 - 09107 109161 - 09167 109201 - 09204 109221 - 09223 109227
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Original Issue: January 30, 2012 A3537 12 of 36 BOEING SERVICE BULLETIN A3537