# SDR UIEA2012090200375

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 31, 2012
- Submitted: September 2, 2012
- Operation: Air carrier
- Aircraft: [N476MC](https://openairdocs.org/aircraft/N476MC), registered now
- Make and model: Boeing 747-47UF
- Registry model: [Boeing 747-47UF](https://openairdocs.org/model/boeing-747-47uf) (OpenAirDocs)
- Aircraft serial: 29256
- Aircraft time: 58,813 hours, 10,116 cycles
- Engine: Ge CF680C2B1F
- System (JASC): [7810 · Engine Collector/Tailpipe/Nozzle](https://openairdocs.org/jasc/7810)
- Part: Sleeve
- Condition: Cracked
- Location: Nr 2 Exhaust
- 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/UIEA2012090200375

## Discrepancy

DURING MX,  FOUND A CRACK ON THE EXHAUST NOZZLE OUTER SLEEVE, APPROX AT 3 O'CLOCK POSITION (RT SIDE) ON THE NR 2 ENGINE. THE CRACK IS APPROX 3" LONG AND IS 1" FROM AFT SIDE OF EXHAUST SLEEVE JUST IN FRONT OF NAC STA 361.923 .  IAW SRM 54-41-30 THE DISTANCE BETWEEN THE CRACK AND THE EDGE IS OUT OF LIMITS.  DISPOSITION IS TO STOP DRILL THE ENDS OF THE CRACK WITH A 0.125" DIAMETER HOLE, DVI EVERY 3 FLIGHT CYCLES; AND REMOVAL OF THE PART WITHIN 50 FC (FLIGHT CYCLES).

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