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Commercial Airplanes 707 Service Bulletin ALERT Number: A3365 Original Issue: August 17, 1979 Revision 3: March 09, 2017 ATA System: 5700 5401 SUBJECT: WINGS - INBOARD AND OUTBOARD NACELLE STRUT OVERWING SUPPORT
FITTING INSPECTION AND REPAIR AT WING FRONT SPAR 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 © 1989 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Unpublished Work.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: August 17, 1979 A3365Revision 3: March 09, 2017 1 of 37
2.0
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: August 17, 1979 A3365Revision 3: March 09, 2017 2 of 37 BOEING SERVICE BULLETIN A3365
ALERTALERT
BLANK PAGE
Table of Contents
Revision Transmittal Sheet5
Summary9
1. PLANNING INFORMATION13
A. Effectivity13
1. Airplanes13
2. Spares Affected17
B. Concurrent Requirements17
C. Reason17
D. Description18
E. Compliance19
F. Approval24
G. Manpower24
H. Weight and Balance Changes25
I. Electrical Load Data25
J. References25
1. Existing Data:25
2. Data Supplied with this Service Bulletin:26
3. Installation Drawings Used in the Preparation of this Service Bulletin:26
K. Publications Affected26
L. Interchangeability and Intermixability of Parts26
M. Software Accomplishment Summary26
2. MATERIAL INFORMATION27
A. Material - Price and Availability27
B. Industry Support Information27
C. Parts Necessary for Each Airplane27
1. Kits/Parts27
2. Parts and Materials Supplied by the Operator27
3. Parts Modified and Reidentified28
4. Parts Removed and Not Replaced28
D. Parts Necessary to Change Spares28
E. Special Tooling - Price and Availability28
F. Special Tooling Necessary to do this Service Bulletin28
3. ACCOMPLISHMENT INSTRUCTIONS29
A. GENERAL INFORMATION29
B. WORK INSTRUCTIONS30
FIGURE 1: OVERWING SUPPORT FITTING INSPECTION32
FIGURE 2: OVERWING SUPPORT FITTING REPLACEMENT FASTENERS AND OPTIONAL COLD WORK
.35
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: August 17, 1979 A3365Revision 3: March 09, 2017 3 of 37 BOEING SERVICE BULLETIN A3365
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Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: August 17, 1979 A3365Revision 3: March 09, 2017 4 of 37 BOEING SERVICE BULLETIN A3365
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BLANK PAGE
Commercial Airplanes 707 Service Bulletin ALERT Revision Transmittal SheetNumber: A3365Original Issue: August 17, 1979 Revision 3: March 09, 2017 ATA System: 5700 5401 SUBJECT: WINGS - INBOARD AND OUTBOARD NACELLE STRUT OVERWING SUPPORT
FITTING INSPECTION AND REPAIR AT WING FRONT SPAR This revision includes all pages of the service bulletin.
COMPLIANCE INFORMATION RELATED TO THIS REVISION 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.
Effects of this Revision on airplanes on which Original Issue, Revision 1 or Revision 2 was previously done:
None.
REASON FOR REVISION This revision is sent to change the inspection interval for detailed inspections, High Frequency Eddy Current (HFEC) inspections and ultrasonic inspection and to add alternative HFEC inspections around the aft bolts. The option to repair parts by oversizing the holes has been removed.
The data given in Notice of Status Change 707-3365 NSC 1 is included in this revision.
Terminology has been changed in the Work Instructions to agree with the terminology defined in Paragraph
3.A., General Information - Notes.
These sections were changed:
1. Summary, Concurrent Requirements: Added this section.
2. Summary, Background: Added paragraph, added references to Service Related Problem (SRP) and Fleet Team Digest (FTD).
3. Summary, Action: Revised paragraph.
4. Summary, Effectivity: Added reference to Paragraph 1.A.1., Airplanes.
5. Summary, Compliance: Added this section and added AD statement and reference to Paragraph 1.E., Compliance.
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: August 17, 1979 A3365Revision 3: March 09, 2017 5 of 37
6. Summary, Industry Support Information: Added this section and warranty statement.
7. Summary, Manpower: Removed table and added reference to Paragraph 1.G., Manpower.
8. Summary, Material Information: Added this section and added operator supplied parts/materials statement and reference to Paragraph 2.A., Material - Price and Availability.
9. Summary, Illustration: Revised text.
10. Paragraph 1.A.1., Airplanes: Updated the format of the effectivity.
11. Paragraph 1.B., Concurrent Requirements: Added this section.
12. Paragraph 1.C., Reason: Revised text and added revision 2 and revision 3 statements.
13. Paragraph 1.D., Description: Revised paragraphs and added extra work statement and table.
14. Paragraph 1.E., Compliance: Added this section and Compliance Table, and added AD, compliance and accomplishment statements.
15. Paragraph 1.G., Manpower: Added task hour statement and revised table format.
16. Paragraph 1.I., Electrical Load Data: Added this section and statement.
17. Paragraph 1.J.1., Existing Data. Updated paragraph to incorporate added references.
18. Paragraph 1.J.2., Data Supplied with this Service Bulletin: Added this paragraph and statement (no vertical line shown for this change).
19. Paragraph 1.J.3., Illustration Drawings used in the Preparation of this Service Bulletin: Added this paragraph and statement.
20. Paragraph 1.K.2., Damage Tolerance Based Structural Inspections: Added this paragraph and statement.
21. Paragraph 1.L., Interchangeability and Intermixability of Parts: Added this section and statement.
22. Paragraph 1.M., Software Accomplishment Summary: Added this section and statement.
23. Paragraph 2. Material Information: Removed: Parts Required Per Airplane, Parts Required to Modify Spares, Special Tools and Equipment Required and Existing Parts Accountability.
24. Paragraph 2. Material Information: Added : 2.A., Material - Price and Availability, and text; 2.B., Industry Support Information, and text; 2.C., Parts Necessary or each Airplane; 2.C.1., Kits/Parts, and text;
2.C.2., Parts and Materials Supplied by Operator, and text; 2.C.3., Parts Modified and Reidentified, and text; 2.C.4., Parts Removed and Not Replaced, and text; 2.D., Parts Necessary to Change Spares, and text; 2.E., Special Tooling - Price and Availability, and text; 2.F., Special Tooling Necessary to do this Service Bulletin, and text.
25. Paragraph 3. Accomplishment Instructions: Added Paragraph 3.A., General Information and text, and added Paragraph 3.B., Work Instructions with revised text.
26. Figure 1: Revised and added extra view on illustration and revised circle numbers. Revised circle notes and added material identification inspection, NDT references, and an alternative HFEC inspection.
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: August 17, 1979 A3365Revision 3: March 09, 2017 6 of 37 BOEING SERVICE BULLETIN A3365
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27. Figure 2: Revised illustration and circle numbers. Removed and revised notes, added optional cold working of holes, SOPM references, HFEC procedure, and added instruction to increase hole size if no is crack found. Replaced bolt part number.
Vertical lines are put on the left edge of each page, except in Paragraph 1.A., Effectivity and format changes, to show the location of all content changes.
Pages with no vertical lines have no changes.
REVISION HISTORY August 17, 1979Original Issue:
November 30, 1979Revision 1:
January 31, 1991Revision 2:
March 09, 2017Revision 3:
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: August 17, 1979 A3365Revision 3: March 09, 2017 7 of 37 BOEING SERVICE BULLETIN A3365
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Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: August 17, 1979 A3365Revision 3: March 09, 2017 8 of 37 BOEING SERVICE BULLETIN A3365
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Commercial Airplanes 707 Service Bulletin ALERT SummaryNumber: A3365Original Issue: August 17, 1979 Revision 3: March 09, 2017 ATA System: 5700 5401 SUBJECT: WINGS - INBOARD AND OUTBOARD NACELLE STRUT OVERWING SUPPORT
FITTING INSPECTION AND REPAIR AT WING FRONT SPAR
THIS DOCUMENT 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 DOCUMENT TO THE NEW OPERATOR. IF APPLICABLE SPARES HAVE BEEN SOLD, SEND THIS DOCUMENT TO THE NEW OWNER.
CONCURRENT REQUIREMENTS None.
BACKGROUND Fatigue cracks have been reported in the overwing support fitting on eight airplanes with 26,000 to 55,300 flight-hours (9,600 to 27,200 flights). Four fittings had cracks at the fastener holes for attachment to the wing front spar upper chord horizontal flange. Four were cracked at the bolt hole immediately forward of the spar chord.
The inboard and outboard nacelle struts are also supported by the more critical midspar fittings which are inspected and replaced if required in service bulletin 707A3183 Revision 6. Service bulletin 707A3183 Revision 6 has been created to address the fracture of the midspar fitting that resulted in the separation of the inboard strut and engine from the airplane. Service bulletin 707A3183 Revision 6 has new detailed inspections and High Frequency Eddy Current (HFEC) inspections. Existing service and regulatory actions for other nacelle strut fittings, including the overwing support fitting, are not sufficient for in-time detection of any crack which could lead to separation of an engine. As a result, service bulletin 707A3365 Revision 3 has been created to increase the frequency of the detailed, HFEC and ultrasonic inspections of the overwing support fitting, in alignment with inspections for the midspar fittings.
Boeing Service Related Problem (SRP) 707-54-0155 is related to this service bulletin.
Boeing Fleet Team Digest (FTD) 707 FTD 54-05001 is related to this service bulletin.
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: August 17, 1979 A3365Revision 3: March 09, 2017 9 of 37
ACTION Inspect the overwing support fittings for any crack at the bolt hole forward of the wing front spar and at the holes for the four fasteners attaching the fitting to the spar. At the forward hole, inspection must be made with a detailed inspection, and with either a surface High Frequency Eddy Current (HFEC) inspection or an open hole HFEC inspection. At the four aft holes, inspection must be made with a detailed inspection and either a surface HFEC inspection or ultrasonically. Any crack may be repaired by contacting The Boeing Company for repair instructions and doing the repair, or by replacing the part. Repeat inspections in accordance with this service bulletin.
EFFECTIVITY All 707 and 720 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,and/or repair procedures given in this service bulletin.
MANPOWER Refer to Paragraph 1.G., Manpower.
MATERIAL INFORMATION Operator Supplied Parts/Materials.
Refer to Paragraph 2.A., Material - Price and Availability.
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: August 17, 1979 A3365Revision 3: March 09, 2017 10 of 37 BOEING SERVICE BULLETIN A3365
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BOEING SERVICE BULLETIN A3365
ALERT ALERT
INBOARD NACELLE OUTBOARD NACELLE.
DO A DETAILED INSPECTION
AND HIGH FREQUENCY EDDY
NACELLE STRUT CURRENT (HFEC) INSPECTION FWD
DO A DETAILED
INSPECTION AND DO
HFEC OR ULTRASONIC
INSPECTION WING FRONT SPAR UPPER CHORD 2539985 Original Issue: August 17, 1979 Revision 3: March 09, 2017 Export Controlled ECCN: 9E991 - BOEING A3365 PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 11 of 37
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: August 17, 1979 A3365Revision 3: March 09, 2017 12 of 37 BOEING SERVICE BULLETIN A3365