# SDR UIEA201000230

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 20, 2010
- Submitted: September 21, 2010
- Operation: Air carrier
- Aircraft: [N493MC](https://openairdocs.org/aircraft/N493MC), registered now
- Make and model: Boeing 747-47UF
- Registry model: [Boeing 747-47UF](https://openairdocs.org/model/boeing-747-47uf) (OpenAirDocs)
- Aircraft serial: 29254
- Aircraft time: 49,173 hours, 7,879 cycles
- Engine: Ge CF680
- System (JASC): [7810 · Engine Collector/Tailpipe/Nozzle](https://openairdocs.org/jasc/7810)
- Part: Nozzle
- 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/UIEA201000230

## Discrepancy

EO 4478A138: DURING MX WALKAROUND, MX FOUND 1EA CRACK ON THE NR2 ENGINE EXHAUST NOZZLE OUTER SLEEVE, AT APPROX THE 9 O'CLOCK POSITION. THE CIRCUMFERENTIAL CRACK IS APPROX 4.5 IN LONG. IAW SRM 54-41-30 THE LENGTH OF THE CRACK IS OUT OF LIMITS. DISPOSITION IS TO STOP DRILL THE ENDS OF THE CRACK WITH A 0.125 IN. DIAMETER HOLE (DRILL BIT); DVI EVERY 3 FLIGHT CYCLES; AND REMOVAL OF THE PART PRIOR TO THE ACCUMULATION OF 30 FC (FLIGHT CYCLES) AFTER PART 1.

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