# SDR UIEA2011041000242

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 10, 2011
- Submitted: April 11, 2011
- Operation: Air carrier
- Aircraft: [N429MC](https://openairdocs.org/aircraft/N429MC), registered now
- Make and model: Boeing 747481
- Aircraft serial: 24833
- Aircraft time: 83,121 hours, 11,359 cycles
- System (JASC): [5414 · Nacelle/Pylon, Plate/Skin](https://openairdocs.org/jasc/5414)
- Part: Skin
- Condition: Cracked
- Location: Rt 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/UIEA2011041000242

## Discrepancy

ENGINE COWLING - NR 4 RT ENGINE CORE COWL OUTER SKIN - CRACK - REPAIR - DURING MX WALKAROUND, MX FOUND A CRACK ON THE NR 4 RT CORE COWL OUTER SKIN.  THE CIRCUMFERENTIAL CRACK IS APPROX 1 IN LONG.  THE LENGTH OF THE CRACK EXCEEDS THE SRM LIMITS.  (DISPOSITION IS TO STOP DRILL THE LOWER ENDS OF THE CRACK WITH A 0.250 IN. DIAMETER HOLE; DVI EVERY 3 FLIGHT CYCLES; AND A PERMANENT REPAIR AT THE NEXT A-CHECK AFTER PART 1; EO 4471A070, SRM 51-10-02, SRM 54-41-01 FIG 101, SRM 54-41-01 FIG 201, RPR 3, DER 8110-3 FORM DTD 10APR11.)

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