# SDR FDEA201207202627

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 20, 2012
- Submitted: July 23, 2012
- Operation: Air carrier
- Aircraft: [N601FE](https://openairdocs.org/aircraft/N601FE), registered now
- Make and model: Doug MD-11F
- Registry model: [Doug MD-11F](https://openairdocs.org/model/mcdonnell-douglas-md-11f) (OpenAirDocs)
- Aircraft serial: 48401
- Aircraft time: 67,448 hours, 16,211 cycles
- System (JASC): [2612 · Fire Detection](https://openairdocs.org/jasc/2612)
- Part: Fire Detector
- Part number: 2240153503
- Part serial: D78869
- Condition: False Activation
- Location: Nr 1 Nacelle
- Stage of operation: TO
- How discovered: O
- Nature of condition: N
- Precautionary procedure: C
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/FDEA201207202627

## Discrepancy

NR 1 FIRE INDICATION WITH BELL AT MAX POWER DURING TAKE OFF.  INITIATED REJECTION AT 120KIAS. SHUTDOWN ENGINE  AND FIRED AGENT BOTTLE.  FIRE INDICATION QUIT AFTER THROTTLES RETARDED TO IDLE.  R & R A & B UPPER TURB LOOPS AND RAIL ASSY IAW MM.  REF 26-11-03-4, IAW FDCU1 ADJ/TEST IAW MM REF 26-11-02-5 AND CLEARED A LOOP FAULT.  FDCU1 STILL SHOWS 'UP RT FIRE DET ASSY B'. T/S IAW FIM 26-11 AND VERIFIED RESISTANCE, FIG 103, SH2 AT 1450 OHMS BETWEEN PINS J & K, ALSO CONTINUITY BTWEEN J & K TO GROUND. CONTINUED SHAKE AND FOUND A PREVIOUSLY REPAIRED WIRE HARNESS SHOWING ERRATIC 'B' LOOP CONTINUITY.  READING DURING SHAKE.   PERFORMED RTS ON FDCU1 ALL TESTS GOOD ON LOOP A.

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