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737 Classic Trailing Edge Flap Carriage Solution

737 Classic Trailing Edge Flap Carriage Solution. 737C Carriage Installation. 737 Classic Fleet Concern TE Flap Carriage Spindle Fractures.

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737 Classic Trailing Edge Flap Carriage Solution

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  1. 737 Classic Trailing Edge Flap Carriage Solution

  2. 737C Carriage Installation

  3. 737 Classic Fleet Concern TE Flap Carriage Spindle Fractures • Fracture of both inboard and outboard flap carriage spindles in the critical “A” location or through the “B” location to the cross bolt on an outboard flap may preclude continued safe flight and landing of the airplane. • Southwest Airlines experienced the first reported “dual fracture” during approach for landing in November 2003. • Fractures in this area are caused primarily by corrosion on the carriage spindles. B A

  4. FAA Notice of Proposed Rule Making 2009-NM-076-AD • AD 2003-24-08 states that the FAA considered the requirements given “interim action” and that they were considering further rulemaking. The FAA has now determined that further rulemaking is necessary. • Effectivity: 737-100/-200/-200C/-300/-400/-500 Series Aircraft • Actions: • Would supersede AD 2003-24-08. • Comply with Gap Check and NDT inspections described in SB 57A1277. • Comply with spindle diameter limits specified in SB 57A1218. • Overhaul carriage spindles > 12,000 cycles or 8 years of service. • Life limit of 48,000 cycles mandatory.

  5. FAA Notice of Proposed Rule Making 2009-NM-210-AD • AD 2009-23-10 states that the FAA considered the requirements given “interim action” and that they were considering further rulemaking. The FAA has now determined that further rulemaking is necessary. • Effectivity: 737-100/-200/-200C/-300/-400/-500 Series Aircraft • Actions: • Would supersede AD 2009-23-10. • Same requirements of AD 2009-23-10 with one exception. • Optional Terminating action to replace or rework suspect HVOF bases would be made mandatory IAW SB 737-57A1304 (Within 4 years after Aug 11th 2009).

  6. Boeing / FAA Action SB 737-57A1304 Rev 1, 8/11/09 • Issued to provide instructions for the inspection of the HVOF coated carriage spindles for corrosion and thermal spray flaking. • Effectivity: 737-300, -400, -500 Series Aircraft (carriages installed during overhaul or replacement after February 2006) • Inspections: • Review of records to determine if applicable carriage has been installed • Detailed or borescope inspection of applicable carriage spindle • Gap check or NDT (ultrasonic) inspection of applicable carriage spindle • Applicable carriages require rework or replacement. Contact Boeing for part disposition. • SB 737-57A1304 is made mandatory by FAA AD 2009-23-10 (Supersedes AD 2008-15-05). • CMM 57-53-36 includes instructions for rework and/or replacement of all suspect carriages.

  7. Boeing / FAA Action AD 2009-23-10 Effective: 11/24/09 Inspection Intervals Optional Terminating Action* * FAA NPRM 2009-NM-210-AD would make the optional terminating action mandatory if adopted.

  8. Boeing / FAA Action SB 737-57A1218 Rev 5, 2/9/09 • Issued to provide instructions for removal, inspection, and overhaul of outboard carriage spindles. Revision 4 of this SB (6/19/07) recommends a finite life limit for carriage sub-assemblies. Prior to Revision 4, carriages were not life limited. • Effectivity: 737-100/-200/-200C/-300/-400/-500 Series Aircraft • Actions: • Records inspection for carriage spindle life limit • Detailed inspection of carriage spindle for corrosion • Overhaul carriage spindles > 12,000 cycles or 8 years of service. • Fractured or severed spindles require replacement, corroded spindles may be overhauled per CMM 57-53-35 (-200 series) or 57-53-36 (-300 series) • FAA Notice of Proposed Rule Making: 2009-NM-076-AD. • The proposed AD would supersede AD 2003-24-08 and require both repetitive inspections and compliance with the Life Limit recommended by SB 757A1218.

  9. Boeing / FAA Action SB 737-57A1218 Rev 5, 2/9/09 Life Limit Compliance

  10. Boeing / FAA Action SB 737-57A1277 Rev 1, 11/25/03 • Issued to provide instructions for the inspection of the outboard midflap carriage spindles to detect fractured, severed, or corroded carriage spindles. • Effectivity: 737-100, -200, -200C, -300, -400, -500 Series Aircraft • Inspections: • NDT Inspection (Ultrasonic Inspection) • Gap Check • Fractured or severed spindles require replacement, corroded spindles require overhaul per CMM 57-53-35 (-200 series) or 57-53-36 (-300 series) and SB 737-57A1218 Rev 5 (or later). • SB 737-57A1277 is made mandatory by FAA AD 2003-24-08.

  11. Boeing / FAA Action SB 737-57A1277 Rev 1, 11/25/03 Inspection Intervals

  12. Boeing / FAA Action SB 737-57A1277 Rev 1, 11/25/03 Inspection Intervals

  13. Other Boeing Action… SB 737-57-1227 Rev 2, 5/16/06 • Issued to provide instructions to rework applicable carriages by replacing roller bearings with new, self-lubricated bearings. • Effectivity: 300/-400/-500 Series Aircraft, Line Positions 1001-3132 • Actions: • Remove existing roller bearings and replace with new self-lubricated bearings • No Compliance Time is Given

  14. Other Boeing Action… SB 737-57-1181 Rev 6, 6/22/95 • Issued to provide instructions to rework applicable carriages by machining clearance chamfers on the carriage detents and side roller assemblies. • Effectivity: 300/-400 Series Aircraft, Line Positions 1001-1698 • Actions: • Chamfer detent lugs and side roller fittings • No Compliance Time is Given

  15. Ongoing Industry Issue • Base Carriage Replacement and Identification • Many 737C TE Flap Carriage Bases are being removed from service due to undersize spindle ODs. Boeing no longer allows any repair to spindles that are out of CMM limits.

  16. Base Carriage Interchangeability

  17. Typical Re-Part Marking of Carriages Used by Some Airlines *Example Only*

  18. 737C Flap Carriage Summary Part Numbers – 737-100/-200 (CMM 57-53-35) • 65-79949-1 thru -8 • 65-46481-1 thru -86, -95, -96 737-300/-400/-500 (CMM 57-53-36) • 65C34483-5 thru -8 • 65-46481-87 thru -94, -97 thru -136, -144 thru -150 Major Service Bulletins • 737-57A1304 – HVOF Spindle Inspection • 737-57A1218 – Spindle OH / Life Limit • 737-57A1277 – Spindle Inspection • 737-57-1227 – Self-lubricated Bearings • 737-57-1181 – Toggle Interference • FAA Directives • 2009-NM-076-AD – SB 737-57A1218/1277 • AD 2009-23-10 – SB 737-57A1304 • AD 2003-24-08 – SB 737-57A1277 • Curtiss-Wright Repair Station Capability • Complete spindle overhaul capability • Turn Around Time • Multiple scenarios, but normally 17 calendar days or less • Flat-Rate overhaul pricing available: • Greased bearing configurations • Greaseless bearing configurations • Exchange Units Available The Outboard Flap Carriage Assy. supports the Flap on the Flap Track and moves the Flap during extension or retraction.

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