# SDR ASAA2018031724025

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 17, 2018
- Submitted: March 28, 2018
- Operation: Air carrier
- Aircraft: [N557AS](https://openairdocs.org/aircraft/N557AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35176
- Aircraft time: 44,885 hours, 13,248 cycles
- System (JASC): [2613 · Overheat Detection](https://openairdocs.org/jasc/2613)
- Part: Terminal
- Part number: 902862
- Condition: Loose
- Location: Nr 1 Ovrht Loop
- Stage of operation: IN
- How discovered: C
- Nature of condition: L
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2018031724025

## Discrepancy

NR 1 ENGINE, LOOP B OVERHEAT,  HANDLE LIGHTS DO NOT ILLUMINATE ON OVERHEAT TEST.  ACFT GROUNDED.    MOVED THE NR 1 ENGINE OVERHEAT DETECTOR SWITCH TO NORMAL POSITION.  PERFORMED ALT DEACTIVATION PROCEDURES IAW CHAP 5, TABLE 3.  TERMINATED LOOSE TERMINALS ON THE NR 1 ENGINE CORE FIRE DETECTION HARNESS IAW AMM 26-11-02.  MEASURED OPEN CIRCUIT ON NR 1 ENGINE LEFT CORE FIRE DETECTOR ASSEMBLY.   REMOVED AND REPLACED NR 1 ENGINE LEFT CORE FIRE DETECTOR ASSEMBLY. OPS TESTED GOOD IAW AMM 26-11-01.

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