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Commercial Airplanes 737 Service Bulletin ALERT Number: 737-57A1327 Original Issue: May 20, 2016 Revision 2: July 25, 2017 ATA System: 5740 SUBJECT: WINGS - Leading Edge And Leading Edge Devices - Krueger Flap Inspection 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 © 2016 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Unpublished Work.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: May 20, 2016 737-57A1327Revision 2: July 25, 2017 1 of 66
4.0
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: May 20, 2016 737-57A1327Revision 2: July 25, 2017 2 of 66 BOEING SERVICE BULLETIN 737-57A1327
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BLANK PAGE
Table of Contents
Revision Transmittal Sheet5
Summary9
1. PLANNING INFORMATION13
A. Effectivity13
1. Airplanes13
2. Spares Affected35
B. Concurrent Requirements35
C. Reason35
D. Description36
E. Compliance38
F. Approval42
G. Manpower42
H. Weight and Balance Changes43
I. Electrical Load Data43
J. References43
1. Existing Data:43
2. Data Supplied with this Service Bulletin:43
3. Installation Drawings Used in the Preparation of this Service Bulletin:44
K. Publications Affected44
L. Interchangeability and Intermixability of Parts44
M. Software Accomplishment Summary44
2. MATERIAL INFORMATION45
A. Material - Price and Availability45
B. Industry Support Information45
C. Parts Necessary for Each Airplane45
1. Kits/Parts45
2. Parts and Materials Supplied by the Operator45
3. Parts Modified and Reidentified45
4. Parts Removed and Not Replaced45
D. Parts Necessary to Change Spares46
E. Special Tooling - Price and Availability46
F. Special Tooling Necessary to do this Service Bulletin46
3. ACCOMPLISHMENT INSTRUCTIONS47
A. GENERAL INFORMATION47
B. WORK INSTRUCTIONS48
FIGURE 1: LEFT WING - KRUEGER FLAP 1 AND 2 BULLNOSE ATTACHMENT HARDWARE ONE-TIME
INSPECTION51
FIGURE 2: RIGHT WING - KRUEGER FLAP 3 AND 4 BULLNOSE ATTACHMENT HARDWARE ONE-TIME
INSPECTION54
FIGURE 3: LEFT WING - KRUEGER FLAP 1 AND 2 BULLNOSE ATTACHMENT HARDWARE
INSTALLATION57
FIGURE 4: RIGHT WING - KRUEGER FLAP 3 AND 4 BULLNOSE ATTACHMENT HARDWARE
INSTALLATION60
APPENDIX A: LOGIC DIAGRAM FOR PARAGRAPH 1.E. COMPLIANCE: TABLE 1: KRUEGER FLAP
BULLNOSE ATTACHMENT HARDWARE ONE-TIME INSPECTION. [Group 1]63
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Original Issue: May 20, 2016 737-57A1327Revision 2: July 25, 2017 3 of 66 BOEING SERVICE BULLETIN 737-57A1327
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APPENDIX B: LOGIC DIAGRAM FOR PARAGRAPH 1.E. COMPLIANCE: TABLE 2: KRUEGER FLAP
BULLNOSE ATTACHMENT HARDWARE ONE-TIME INSPECTION [Group 2]64
APPENDIX C: LOGIC DIAGRAM FOR PARAGRAPH 1.E. COMPLIANCE: TABLE 3: KRUEGER FLAP
BULLNOSE ATTACHMENT HARDWARE ONE-TIME INSPECTION ON REPLACED KRUEGER
FLAPS65
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: May 20, 2016 737-57A1327Revision 2: July 25, 2017 4 of 66 BOEING SERVICE BULLETIN 737-57A1327
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Commercial Airplanes 737 Service Bulletin ALERT Revision Transmittal SheetNumber: 737-57A1327Original Issue: May 20, 2016 Revision 2: July 25, 2017 ATA System: 5740 SUBJECT: WINGS - Leading Edge And Leading Edge Devices - Krueger Flap Inspection This revision includes all pages of the service bulletin.
COMPLIANCE INFORMATION RELATED TO THIS REVISION Federal Aviation Administration (FAA) Notice of Proposed Rule Making NPRM 2016-NM-091-AD, is related to this service bulletin.
The Federal Aviation Administration (FAA) will possibly release an additional 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 or Revision 1 was previously done:
ActionConditionGroup Airplanes that have replaced any Krueger Flap no. 1, 2, 3, or 4 after accomplishment of the one-time inspection on a given Krueger Flap, determine if the replaced Krueger Flap has accomplished this service bulletin.
All Airplanes1 Do a one-time detailed inspection for discrepancies in the bullnose attachment hardware of the replaced Krueger flap and any corrective actions at the times specified in Paragraph 1.E., Compliance.
Airplanes with any Krueger flap 1, 2, 3, or 4 replaced with a Krueger flap that has not accomplished this service bulletin or with a Krueger flap where the accomplishment of this service bulletin is not known.
No further action required on the replaced Krueger flap.
Airplanes with any Krueger flap 1, 2, 3, or 4 replaced with a Krueger flap that has accomplished this service bulletin.
Airplanes line number 5503-6421 were added to Group 2 of this service bulletin effectivity.
Airplanes line number 6422-6465 were added to Group 3 of this service bulletin effectivity.
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: May 20, 2016 737-57A1327Revision 2: July 25, 2017 5 of 66
REASON FOR REVISION This revision is sent to give alternative repair instructions to replace cracked or deformed bullnose hinge lugs or clevis assemblies on the affected Krueger flap instead of replacing the entire Krueger flap if any crack or deformation is found on bullnose hinge lugs or clevis assemblies after the initial inspection of the attachment hardware. This revision is also sent to add airplanes in the effectivity due to a recent incident of missing Bullnose attachment hardware and address Krueger flaps that are replaced on the airplane.
These sections were changed:
1. Summary, Background - added in-service event information and new SRP reference.
2. Summary, Action - Split actions by airplane grouping. Also added information that cracked or deformed parts of the flap can be replaced instead of replacing the entire flap and added actions for airplanes that have replaced any Krueger flap 1, 2, 3, or 4.
3. Summary, Compliance - added NPRM information.
4. Summary, Manpower - added manpower information for added airplanes.
5. Paragraph 1.A., Effectivity, added airplanes and updated effectivity information and spares information.
6. Paragraph 1.C., Reason - added in-service event information, new SRP reference, and reason for this revision.
7. Paragraph 1.D., Description - Split actions by airplane grouping. Added information that cracked or deformed parts of the flap can be replaced instead of replacing the entire flap and added actions for airplanes that have replaced any Krueger flap 1, 2, 3, or 4. Also added Effects of this Revision on airplanes on which Original Issue or Revision 1 was previously done.
8. Paragraph 1.E., Compliance - added NPRM information, updated group information, added information that cracked or deformed parts of the flap can be replaced instead of replacing the entire flap, and added compliance tables for added airplanes and airplanes with replaced Krueger flaps.
9. Paragraph 1.F., Approval - added information for airplanes with Supplemental Type Certificate (STC) number ST00830SE installed.
10. Paragraph 1.J., References - updated the reference list.
11. Paragraph 3.B., Work Instructions - added instruction to replace cracked or deformed parts of the flap as an alternative action and added instructions for airplanes that have replaced any Krueger flap 1, 2, 3, or 4. Also applied group information to the work instructions.
12. APPENDIX A - added information that cracked or deformed parts of the flap can be replaced instead of replacing the entire flap and applied the logic diagram to Group 1 airplanes.
13. Added APPENDIX B to provide a logic diagram for Group 2 airplanes.
14. Added APPENDIX C to provide a logic diagram for airplanes with replaced Krueger flaps.
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.
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: May 20, 2016 737-57A1327Revision 2: July 25, 2017 6 of 66 BOEING SERVICE BULLETIN 737-57A1327
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Pages with no vertical lines have no changes.
REVISION HISTORY May 20, 2016Original Issue:
September 28, 2016Revision 1:
July 25, 2017Revision 2:
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: May 20, 2016 737-57A1327Revision 2: July 25, 2017 7 of 66 BOEING SERVICE BULLETIN 737-57A1327
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Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: May 20, 2016 737-57A1327Revision 2: July 25, 2017 8 of 66 BOEING SERVICE BULLETIN 737-57A1327
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BLANK PAGE
Commercial Airplanes 737 Service Bulletin ALERT SummaryNumber: 737-57A1327Original Issue: May 20, 2016 Revision 2: July 25, 2017 ATA System: 5740 SUBJECT: WINGS - Leading Edge And Leading Edge Devices - Krueger Flap Inspection
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 The bullnose of a 737-800 Krueger Flap departed an airplane during taxi and caused damage to the wing structure and part of the thrust reverser. There have been six (6) other in-service reports of missing bullnose attachment hardware resulting in a bullnose droop condition but no departure of the part from the airplane. If this service bulletin is not accomplished, the Krueger Flap bullnose could depart the airplane during flight, which could damage empennage structure leading to inability to maintain continued safe flight and landing.
After the release of Revision 1 of the service bulletin, an operator had an air turn back due to flight crew reporting flap retract light remaining ON after flap was retracted during take off phase. Upon landing, the ground crew found that the #2 Krueger Flap bullnose hinge bolt was missing. This incident occurred on an airplane that was not in the effectivity of Original Issue and Revision 1. Boeing has determined that loss of the bolt is related to improper installation of the bullnose hardware and some limited airplanes not in the effectivity of Original Issue and Revision 1 are still subject to this possible issue during production.
Boeing Fleet Team Digest (FTD) 737NG FTD 57-15003 is related to this service bulletin.
Boeing Service Related Problem (SRP) 737NG-57-0283 is related to this service bulletin.
Boeing Service Related Problem (SRP) 737NG-57-0313 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 AffectedYesSpares Affected Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: May 20, 2016 737-57A1327Revision 2: July 25, 2017 9 of 66
ReferenceAffectedPlanning Data Paragraph 1.E., Compliance and Paragraph
1.F., Approval YesAD Related Paragraph 1.H., Weight and Balance ChangesNoWeight and Balance Change 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 Parts/Material Paragraph 2.F., Special Tooling Necessary to do this Service Bulletin NoSpecial Tooling Required ACTION Group 1-2:
Krueger Flap Bullnose Attachment Hardware One-Time Inspection on Existing and Replaced Krueger Flaps
1. Do a one-time detailed inspection for discrepancies in the bullnose attachment hardware of Krueger Flaps no. 1, 2, 3 and 4. If any discrepancy is found, do a secondary detailed inspection for any crack or any deformation and either replace the discrepant hardware or Krueger Flap. As an alternative to replacement of the Krueger flap, replace the cracked or deformed parts of the flap.
2. There is no action required for airplanes with Krueger Flaps no. 1, 2, 3, and 4 not replaced after the accomplishment of the one-time detailed inspection. Airplanes that have replaced any Krueger Flap no. 1, 2, 3, or 4 after accomplishment of the one-time inspection on a given Krueger Flap, determine if the replaced Krueger Flap has accomplished this service bulletin.
– If any Krueger Flap no. 1, 2, 3, or 4 is replaced with a Krueger flap that has accomplished this service bulletin, no further action is required on the replaced Krueger flap.
– If any Krueger Flap no. 1, 2, 3, or 4 is replaced with a Krueger flap that has not accomplished this service bulletin or with a Krueger flap where the accomplishment of this service bulletin is not known, do a one-time detailed inspection for discrepancies in the bullnose attachment hardware of the replaced Krueger flap. If any discrepancy is found, do a secondary detailed inspection for any crack or any deformation and either replace the discrepant hardware or Krueger flap. As an alternative to replacement of the Krueger flap, replace the cracked or deformed parts of the flap.
Group 3:
Krueger Flap Bullnose Attachment Hardware One-Time Inspection on Replaced Krueger Flaps
1. There is no action required for airplanes with Krueger Flaps no. 1, 2, 3, and 4 not replaced since delivery. Determine if any Krueger Flap no. 1, 2, 3, or 4 has been replaced and if any replaced Krueger Flap has accomplished this service bulletin.
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Original Issue: May 20, 2016 737-57A1327Revision 2: July 25, 2017 10 of 66 BOEING SERVICE BULLETIN 737-57A1327
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– If any Krueger Flap no. 1, 2, 3, or 4 is replaced with a Krueger flap that has accomplished this service bulletin, no further action is required on the replaced Krueger flap.
– If any Krueger Flap no. 1, 2, 3, or 4 is replaced with a Krueger flap that has not accomplished this service bulletin or with a Krueger flap where the accomplishment of this service bulletin is not known, do a one-time detailed inspection for discrepancies in the bullnose attachment hardware of the replaced Krueger flap. If any discrepancy is found, do a secondary detailed inspection for any crack or any deformation and either replace the discrepant hardware or Krueger flap. As an alternative to replacement of the Krueger flap, replace the cracked or deformed parts of the flap.
EFFECTIVITY 737-600/700/700C/800/900/900ER Airplane(s). Refer to Paragraph 1.A.1., Airplanes, for the list of affected airplanes.
Refer to Paragraph 1.A.2., Spares Affected, for the list of affected components.
COMPLIANCE Federal Aviation Administration (FAA) Notice of Proposed Rule Making NPRM 2016-NM-091-AD, is related to this service bulletin.
The Federal Aviation Administration (FAA) will possibly release an additional 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 available for airplanes in warranty as of January 28, 2015 Please refer to Paragraph
2.B., Industry Support Information. The warranty remedies will expire eight years from the original issue date of this service bulletin.
MANPOWER Elapsed HoursTotal Task HoursAirplanes
2.802.80Group 1, Group 2, and Group 3
MATERIAL INFORMATION Operator Supplied Parts/Materials.
Refer to Paragraph 2.A., Material - Price and Availability.
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Original Issue: May 20, 2016 737-57A1327Revision 2: July 25, 2017 11 of 66 BOEING SERVICE BULLETIN 737-57A1327
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BOEING SERVICE BULLETIN 737-57A1327
ALERT ALERT
LE STA LE STA
218.88 206.32 LE STA
190.85 LE STA
180.52 LE STA
166.32 LE STA
158.82 INBD NO. 1 KRUEGER FLAP IS SHOWN NO. 4 KRUEGER FLAP IS OPPOSITE LE STA
150.82
DO A ONE-TIME DETAILED
INSPECTION FOR DISCREPANCIES IN THE ATTACHMENT HARDWARE.
LE STA
104.52 INBD
DO A ONE-TIME DETAILED NO. 2 KRUEGER FLAP IS SHOWN, INSPECTION FOR DISCREPANCIES NO. 3 KRUEGER FLAP IS OPPOSITE IN THE ATTACHMENT HARDWARE. 2483896 Original Issue: May 20, 2016 Revision 2: July 25, 2017 PROPRIETARY - Copyright © Unpublished Export Controlled ECCN: 9E991 - BOEING 737-57A1327 Work - See page 1 for detalls. 12 of 66