# SDR UIEA2011090900482

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 31, 2011
- Submitted: September 9, 2011
- Operation: Air carrier
- Aircraft: N523MC
- Make and model: Boeing 747-2D7B
- Registry model: [Boeing 747-2D7B](https://openairdocs.org/model/boeing-747-2d7b) (OpenAirDocs)
- Aircraft serial: 21782
- Aircraft time: 104,519 hours, 21,333 cycles
- System (JASC): [5411 · Nacelle/Pylon, Frame/Spar/Rib](https://openairdocs.org/jasc/5411)
- Part: Rib
- Condition: Damaged
- Location: Lt Nacelle
- 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/UIEA2011090900482

## Discrepancy

DURING THE PRESENT C4 CHECK, NR 2 PYLON LT NAC STA 332 FRAME RIB WAS FOUND WITH A WEAR AROUND MOUNT BOLT HOLE, APPROX 0.035 INCH MATERIAL REMOVED. THE ORIGINAL THICKNESS OF THE RIB WAS REPORTED AT 0.080 INCH.

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