# SDR KCSA20130818003

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 18, 2013
- Submitted: August 20, 2013
- Operation: Air carrier
- Aircraft: [N794CK](https://openairdocs.org/aircraft/N794CK), registered now
- Make and model: Boeing 747222B
- Aircraft serial: 23737
- Aircraft time: 77,296 hours, 10,481 cycles
- System (JASC): [3610 · Pneumatic Distribution System](https://openairdocs.org/jasc/3610)
- Part: Valve
- Part number: 227565
- Part serial: 142
- Condition: Failed
- Location: Nr 4 Engine
- Stage of operation: CL
- How discovered: O
- Nature of condition: M, J
- Precautionary procedure: E, J, A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/KCSA20130818003

## Discrepancy

AFTER TAKEOFF,  NR 4 ENGINE FIRE WARNING ILLUMINATED WITH BELL AND NR 4 NACELLE TEMP AT 9. ACCOMPLISHED TROUBLESHOOTING PER FIM 36-11-00, FOUND PNEUMATIC PRESSURE RELIEF VALVE SPRING TENSION FAILED CAUSING VALVE TO STICK OPEN.  REPLACED NR 4 ENGINE PNEUMATIC RELIEF VALVE IAW AMM 36-11-11. ACCOMPLISHED HIGH POWER ENG RUN SATISFACTORY.  REPLACED NR 4 ENGINE HIGH PRESSURE SHUTOFF VALVE DUE TO SCHEDULING ERROR IAW AMM 36-11-06.  OPS CHECKED, ENGINE RUN SATISFACTORY.  REPLACED NR 4 ENGINE HIGH STAGE BLEED VALVE CONTROLLER FOR VALVE SCHEDULE ERROR IAW AMM 36-11-06.  ENGINE OPERATIONS AND BLEEDS NORMAL DURING HIGH POWER ENGINE RUN-UP.  ACFT OK FOR SERVICE.

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