SDR TWA9743

Service difficulty report · Fire Detector · Boeing 747121

Difficulty date: March 29, 1997
Submitted: March 26, 2000
Operation: Air carrier
Aircraft: N604FF
Make and model: Boeing 747121
Aircraft serial: 19659
System (JASC): 2612 · Fire Detection
Part: Fire Detector
Condition: Failed
Location: Nr 4 Engine
Stage of operation: TO
Nature of condition: N
Precautionary procedure: H

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

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)