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SDR ASAA2021081735785

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Service difficulty report · Fire Loop · Boeing 737990ER

FAA SDR system

Difficulty date
August 17, 2021
Submitted
August 27, 2021
Operation
Air carrier
Aircraft
N433AS
Make and model
Boeing 737990ER
Aircraft serial
41704
Aircraft time
29,307 hours, 9,326 cycles
System (JASC)
2612 · Fire Detection
Part
Fire Loop
Condition
Faulted
Location
Nr 1 Engine
Stage of operation
IN
How discovered
V
Nature of condition
O
Precautionary procedure
K

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

What was found

#1 ENGINE FIRE DETECTION LOOP B FAULT. GROUNDED - YES. (RESOLVED ON W/O: 1882315 TASKCARD: N/R-00003 ) MIG 2C S/N 40-0045115 THRU 40-0045117 INITIATED. REMOVED AND REINSTALLED M279 ENGINE AND APU FIRE/OVHT DETECTION MODULE REF B737-900 AMM 26-11-00. REF MIG 2C'S FOR REMOVAL AND REINST93026-48KSALLATION OF APPLICABLE CONNECTORS. WHILE T/S FOUND HIGH RESISTANCE SHORT OF DM19. REMOVED AND REPLACED DM19 REF WDM 26-11-11 PAGE 1 SHEET 1. C. MIG2C # 115 THRU 117. M279 OPS NORMAL REF MM 26-10-01-400-801. #1 ENG B LOOP OPS NORMAL REF MM 26-11-00-710-801. MEL 26-2B CLEARED. C/N 17007433 REMOVED.