# SDR TWA9743

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 29, 1997
- Submitted: March 26, 2000
- Operation: Air carrier
- Aircraft: [N604FF](https://openairdocs.org/aircraft/N604FF), registered now
- Make and model: Boeing 747121
- Aircraft serial: 19659
- System (JASC): [2612 · Fire Detection](https://openairdocs.org/jasc/2612)
- Part: Fire Detector
- Condition: Failed
- Location: Nr 4 Engine
- Stage of operation: TO
- Nature of condition: N
- Precautionary procedure: H
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/TWA9743

## Discrepancy

DURING TAKEOFF, NR 4 ENGINE NACELLE FIRE DETECTION AND FAULT LIGHTS ILLUMINATED WITH A-LOOP NACELLE TEMP INDICATOR OSCILLATION TO F-BAND.  B-LOOP SELECTED AND TESTED, LIGHTS ILLUMINATED BUT A-NACELLE TEMP INDICATOR OSCILLATION CONTINUED DURING CRUISE.  REPLACED UPPER AFT FIRE WARNING ELEMENT PER MM 26-11-00 AND 26-11-02.  REMOVED LOWER FORWARD FIRE WARNING ELEMENT AND REPAIRED BROKEN BRACKET IAW 26-11-02.  REINSTALLED ELEMENT 26-11-02 PG 401.  SYST NOW TEST NORMAL.  OPS CHK ON ENG RUN OK.  (X)

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