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SDR ASAA2015021410634

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Service difficulty report · Fire Loop · Boeing 737890

FAA SDR system

Difficulty date
February 14, 2015
Submitted
February 17, 2015
Operation
Air carrier
Aircraft
N577AS
Make and model
Boeing 737890
Aircraft serial
35186
Aircraft time
30,336 hours, 9,109 cycles
System (JASC)
2612 · Fire Detection
Part
Fire Loop
Condition
Malfunctioned
Location
Nr 2 Nacelle
Stage of operation
TX
How discovered
9
Nature of condition
O
Precautionary procedure
O

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

What was found

FIRE DETECTON SYS FAILED TEST, NR 2 ENGINE LIGHT FAILED TO ILLUMINATE. ACFT GROUNDED. UNABLE TO DUPLICATE DEFECT. NR 2 ENGINE, LOOP B TESTS NORMAL AND M279 CONTROL MODULE SHOWS NO FAULTS WITH LOOP SELECT SWITCH SET TO "BOTH". OPENED COWLS AND INSPECTED NR 2 ENGINE FIRE DETECTION LOOPS AND WIRE HARNESS CONNECTIONS TO LOOPS, NO DEFECTS NOTED. REMOVED, CLEANED, AND REINSTALLED WIRE HARNESS CONNECTIONS FOR LOWER FAN DETECTOR LOOP. CLOSED COWLS AND PERFORMED FIRE AND OVERHEAT DETECTION SYS. OPS TEST IAW MM 26-10-00-710-801. ALL TESTS PASSED.