# SDR UIEA2011121200714

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 8, 2011
- Submitted: December 12, 2011
- Operation: Air carrier
- Aircraft: [N522MC](https://openairdocs.org/aircraft/N522MC), registered now
- Make and model: Boeing 747-2D7B
- Registry model: [Boeing 747-2D7B](https://openairdocs.org/model/boeing-747-2d7b) (OpenAirDocs)
- Aircraft serial: 21783
- Aircraft time: 110,185 hours, 22,062 cycles
- System (JASC): [7830 · Engine Thrust Reverser](https://openairdocs.org/jasc/7830)
- Part: Nozzle
- Part number: 9105M90G05
- Part serial: TLS78026
- Condition: Cracked
- Location: Thrust Reverser
- 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/UIEA2011121200714

## Discrepancy

DURING WALK AROUND CHECK, MX FOUND CRACK APPROX 1 INCH IN LENGTH, ON THE OUTER SLEEVE OF THE LONG FIXED CORE EXHAUST NOZZLE ON THE NR 4 ENGINE AT THE 8 O`CLOCK POSITION (REF FIG 1). (DISPOSITION WAS MADE TO REMOVE ANY BURRS AND WELD REPAIR THE CRACK USING EM 78-11-01, REPAIR 011 AND SPM 70-41-00, WELDING AND BRAZING PRACTICES, EXCLUDING THE POST WELD HEAT TREATMENT, ACCOMPLISH DVI OF REPAIR AREA EVERY "2A" AND PERFORM THE PERMANENT REPAIR AT THE NEXT "C" CHECK.)

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.