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737 Classic Trailing Edge Flap Carriage Solution.

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Presentation on theme: "737 Classic Trailing Edge Flap Carriage Solution."— Presentation transcript:

1 737 Classic Trailing Edge Flap Carriage Solution

2 2 737C Carriage Installation

3 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 A B Fractures in this area are caused primarily by corrosion on the carriage spindles. 737 Classic Fleet Concern TE Flap Carriage Spindle Fractures 3

4 4 AD 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: /-200/-200C/-300/-400/-500 Series Aircraft Actions: Would supersede AD 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. FAA Notice of Proposed Rule Making 2009-NM-076-AD

5 5 AD 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: /-200/-200C/-300/-400/-500 Series Aircraft Actions: Would supersede AD Same requirements of AD with one exception. Optional Terminating action to replace or rework suspect HVOF bases would be made mandatory IAW SB A1304 (Within 4 years after Aug 11 th 2009). FAA Notice of Proposed Rule Making 2009-NM-210-AD

6 Issued to provide instructions for the inspection of the HVOF coated carriage spindles for corrosion and thermal spray flaking. Effectivity: , -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 A1304 is made mandatory by FAA AD (Supersedes AD ). CMM includes instructions for rework and/or replacement of all suspect carriages. Boeing / FAA Action SB A1304 Rev 1, 8/11/09 6

7 7 Inspection Intervals ConditionActionCompliance TimeRepeat Interval (Not to Exceed) All AirplanesRecords inspection to find suspect HVOF carriage spindles (refer to applicable S/Ns) Within 30 days after Aug 5 th, Not Applicable Airplanes with applicable HVOF carriage spindles (refer to applicable S/Ns) Detailed inspection or borescope inspection of carriage spindle Within 30 days after Nov 24 th 2009 or 90 days from installation of a HVOF carriage spindle, whichever occurs later; 90 Day If No Corrosion is FoundGap check or NDT (ultrasonic) inspection per SB 57A1277 Before Further Flight15 days or 150 flight cycles, whichever occurs later If Potential Indications are Found Detailed inspection of entire spindle surface Before Further FlightNot Applicable If Corrosion is FoundReplace CarriageBefore Further FlightNot Applicable If Severed Spindle is IndicatedReplace CarriageBefore Further FlightNot Applicable Airplanes with applicable HVOF carriage spindles (refer to applicable S/Ns) Replace or refurbish the carriage. Refurbished carriages have R added to S/N Within 4 years after 11-Aug Replacement or refurbishment terminates inspections. Boeing / FAA Action AD Effective: 11/24/09 Optional Terminating Action* * FAA NPRM 2009-NM-210-AD would make the optional terminating action mandatory if adopted.

8 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: /-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 (-200 series) or (-300 series) FAA Notice of Proposed Rule Making: 2009-NM-076-AD. The proposed AD would supersede AD and require both repetitive inspections and compliance with the Life Limit recommended by SB 757A1218. Boeing / FAA Action SB A1218 Rev 5, 2/9/09 8

9 9 Life Limit Compliance ConditionActionCompliance Time /-200/-200C /-400/-500 Airplanes with an undocumented carriage or a documented carriage > 48,000 total cycles Replace carriage with a new or documented carriage Within 3 years from 19-Jun-2007 or within 7,500 flight cycles from 19-Jun-2007, whichever occurs first Within 6 years from 19-Jun-2007 or within 15,000 flight cycles from 19-Jun-2007, whichever occurs first. Airplanes with a documented carriage having < 48,000 total cycles Replace carriage with new or documented carriage Prior to carriage accumulating 48,000 cycles or as defined by one of the compliance criteria above, whichever is later. New (zero time) carriages shall not go over 48,000 cycles. Prior to carriage accumulating 48,000 cycles or as defined by one of the compliance criteria above, whichever is later. New (zero time) carriages shall not go over 48,000 cycles. Boeing / FAA Action SB A1218 Rev 5, 2/9/09

10 Issued to provide instructions for the inspection of the outboard midflap carriage spindles to detect fractured, severed, or corroded carriage spindles. Effectivity: , -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 (-200 series) or (-300 series) and SB A1218 Rev 5 (or later). SB A1277 is made mandatory by FAA AD Boeing / FAA Action SB A1277 Rev 1, 11/25/03 10

11 11 Inspection Intervals New Carriages (Never Been Overhauled) thru -500 DaysCycles > 20,000 Cycles or 8 years in service, whichever is less Gap Check330 Ultrasonic NDT ,000 to 20,000 CyclesGap Check15150 Ultrasonic NDT < 12,000 CyclesGap CheckN/A Ultrasonic NDTN/A Boeing / FAA Action SB A1277 Rev 1, 11/25/03

12 12 Inspection Intervals Previously Overhauled Carriages / /-400/-500 DaysCyclesDaysCycles > 20,000 CyclesGap Check Ultrasonic NDT ,000 to 20,000 Cycles or 8 years in service since last OH, whichever is less Gap Check3303 Ultrasonic NDT ,000 to 11,999 Cycles Gap Check Ultrasonic NDT < 3,000 CyclesGap CheckN/A Ultrasonic NDT N/A Boeing / FAA Action SB A1277 Rev 1, 11/25/03

13 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 Actions: Remove existing roller bearings and replace with new self-lubricated bearings No Compliance Time is Given Other Boeing Action… SB Rev 2, 5/16/06 13

14 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 Actions: Chamfer detent lugs and side roller fittings No Compliance Time is Given Other Boeing Action… SB Rev 6, 6/22/95 14

15 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. Ongoing Industry Issue 15

16 16 PositionOld Carriage Sub Assy New Carriage Sub Assy Outboard Flap, Outboard Carriage WBL C C C C C C Outboard Flap, Inboard Carriage WBL C C C C C C C Note: Interchangeabilities listed above based on PN 65C and -31 APL. Base Carriage Interchangeability

17 New Carriage Sub Assy New Carriage PNs (Bearings that need Lubrication) New Carriage PNs (Bearings that are Self- Lubricated) 65C XXX (L/H) XXX (R/H) XXX (L/H) XXX (R/H) 65C XXX (L/H) XXX (R/H) XXX (L/H) XXX (R/H) Note: (L/H) or (R/H) designates position of carriage on the aircraft. Do not mark (L/H) or (R/H) on reworked carriages. **XXX is customer assigned suffix showing that a new base carriage has been used. *Example Only* New Carriage Sub AssyNew Carriage PNs 65C C XXX (L/H) 65C XXX (R/H) 65C C XXX (L/H) 65C XXX (R/H) Note: (L/H) or (R/H) designates position of carriage on the aircraft. Do not mark on reworked carriages. **XXX is customer assigned suffix showing that a new base carriage has been used. Typical Re-Part Marking of Carriages Used by Some Airlines 17

18 The Outboard Flap Carriage Assy. supports the Flap on the Flap Track and moves the Flap during extension or retraction. 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 FAA Directives 2009-NM-076-AD – SB A1218/1277 AD – SB A1304 AD – SB A1277 Major Service Bulletins A1304 –HVOF Spindle Inspection A1218 –Spindle OH / Life Limit A1277 –Spindle Inspection –Self-lubricated Bearings –Toggle Interference /-400/-500(CMM ) 65C thru thru -94, -97 thru -136, -144 thru -150 Part Numbers – /-200 (CMM ) thru thru -86, -95, C Flap Carriage Summary 18


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