SDR ASAA2017041720475

Service difficulty report · Fire Loop · Boeing 737890

Difficulty date: April 17, 2017
Submitted: April 19, 2017
Operation: Air carrier
Aircraft: N589AS
Make and model: Boeing 737890
Aircraft serial: 35686
Aircraft time: 36,040 hours, 10,902 cycles
System (JASC): 2612 · Fire Detection
Part: Fire Loop
Condition: Intermittent
Location: Nr 1 Nacelle
Stage of operation: IN
How discovered: C
Nature of condition: L
Precautionary procedure: K

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

What was found

DURING APU START CHECKLIST, THE NR 1 ENGINE FIRE HANDLE DID NOT ILLUMINATED DURING TEST. ACFT GROUNDED. ACCOMPLISHED ENGINE/APU FIRE DETECT CONTROL MODULE BITE CHECK. FOUND LOOP B UPPER FAN FAULT. ACCOMPLISHED VISUAL INSPECTION OF NR 1 ENGINE UPPER FAN B LOOP. NO DEFECTS FOUND. ACCOMPLISHED CLEANING OF CONNECTORS AND CHECKED OPERATIONAL TESTS IAW AMM 26-11-00-700-801, AND 26-10-00-710-801. ALL OPERATIONAL TESTS NORMAL. ACCOMPLISHED BITE CHECK AGAIN, NO FAULTS.