# SDR FDEA200912074368

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 7, 2009
- Submitted: December 7, 2009
- Operation: Air carrier
- Aircraft: [N921FD](https://openairdocs.org/aircraft/N921FD), registered now
- Make and model: Boeing 757-23A
- Registry model: [Boeing 757-23A](https://openairdocs.org/model/boeing-757-23a) (OpenAirDocs)
- Aircraft serial: 24924
- Aircraft time: 68,004 hours, 21,149 cycles
- System (JASC): [5340 · Fuselage Main, Attach Fittings](https://openairdocs.org/jasc/5340)
- Part: Attach Angle
- Part number: 146N876924
- Condition: Corroded
- Location: Bs 1645
- Stage of operation: IN
- How discovered: V
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/FDEA200912074368

## Discrepancy

THE CHANNEL CLIP, PN 146N8769-24, AND ATTACHING ANGLE, PN 146N8722-41, IN THE R4 DOOR LWR SILL, ARE CORRODED BEYOUND ALLOWABLE LIMITS AND BS 1645. THE CHANNEL CLIP.  PN 146N8769-24 AND ANGLE, PN 146N8722-41, WERE REMOVED AND   REPLACED AT BS 1645, R4 DOOR LWR SILL, IAW SRM 51-40-02. ORIG MATL THICKNESS; .071", AFTER REWORK; .041", FOR BOTH PARTS. FOUND TO BE OUT OF LIMITS IAW SRM 53-60-15. THIS REPAIR IS CLASSIFIED AS A CAT "A" MAJOR REPAIR.

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