# SDR DU4R2007147

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 1, 2007
- Submitted: July 18, 2007
- Operation: Air carrier
- Filed by: [AAR Aircraft Services, LLC, repair station DU4R141M](https://openairdocs.org/faa-repair-station/DU4R141M/aar-aircraft-services-llc.md) (OpenAirDocs)
- Aircraft: N638DL
- Make and model: Boeing 757
- Aircraft serial: 23761
- Aircraft time: 63,658 hours, 29,652 cycles
- Engine: Pwa PW2037
- System (JASC): [5320 · Fuselage Miscellaneous Structure](https://openairdocs.org/jasc/5320)
- Part: Sill
- Part number: 146N852257
- Condition: Corroded
- Location: Bs 1380-1440
- 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/DU4R2007147

## Discrepancy

S/O NR 291043, NR 22641  FOUND HEAVY CORROSION UNDER NUT PLATES IN AFT PIT AT (T) EXTRUSION JUST IB OF C2 DOOR SILL WEB FROM BS 1380 TO BS 1440 S-27R.  REPAIRED BY REMOVING AND REPLACING CHORD PN 146N8522-57 AND ANGLE PN 146N8515-8 IAW SRM 53-00-53 AND 51-40-02.

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