# SDR UPS04243352

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 17, 2004
- Submitted: October 18, 2004
- Operation: Air carrier
- Aircraft: N940UP
- Make and model: Boeing 727185C
- Aircraft serial: 19826
- Engine: Rroyce TAY65154
- System (JASC): [2612 · Fire Detection](https://openairdocs.org/jasc/2612)
- Part: Control Unit
- Condition: Malfunctioned
- Location: Nr 3 Eng Fire
- Stage of operation: DE
- How discovered: O
- Nature of condition: N
- Precautionary procedure: E
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UPS04243352

## Discrepancy

WHEN F/O TURNED OFF F/D ALTITUDE HOLD,  RECEIVED AN INTERMITTENT FIRE WARNING.  THE F/O TAPPED THE GLARE SHIELD AND THE FIRE WARNING LIGHT AND BELL CAME ON STEADY.  ENGINE NR 3 WAS SHUTDOWN IAW PROCEDURES AND UNEVENTFUL.     SIMULATED CREW ACTION BY TAPPING ON GLARE SHIELD-NO DEFECTS FOUND.  CHECK RESISTANCE OF BOTH A AND B LOOPS-NO DEFECTS FOUND.  RAN NR 3 ENG AND CHECKED DUCT LEAKS, NO DEFECTS FOUND.  AS PRECAUTIONARY REMOVED AND REPLACED NR 3 ENG FIRE DETECTOR CONTROL UNIT.  OPS CHECK GOOD.   REF MM 26-11-21.

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