Service difficulty report · Wire Harness · Boeing 737890

Difficulty date
July 5, 2016
Submitted
July 11, 2016
Operation
Air carrier
Aircraft
N568AS
Make and model
Boeing 737890
Aircraft serial
35183
Aircraft time
36,279 hours, 11,147 cycles
Part
Wire Harness
Part number
38884492
Condition
Defective
Location
Apu
Stage of operation
NR
How discovered
O
Nature of condition
N
Precautionary procedure
O

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

What was found

THE FLIGHT CREW VERBALLY ADVISED MAINTENANCE THAT THEY HAD APU FAULT LIGHT. ACFT GROUNDED. FAULT 49-94229 FOUND IN HISTORY IAW FIM 49-90, TASK 807 THIS WAS AN INTERMITTENT FAULT. APU OPS TEST IAW AMM 49-11-00-710-801, GOOD. ACFT RELEASED IAW MEL 49-99A. ENGINEERING REQUEST, INITIAL EVALUATION IAW FIM TASK SHOWED NO FAULTS. DURING APU HARNESS INSPECTION, FOUND CONNECTOR P15 HAD 1.2 MEG OHM CONTINUITY BETWEEN CONDUCTOR A AND SHIELD, WHICH FLUCTUATED WHEN MANIPULATED. REPAIRED SHIELD TERMINATION AT P15 IAW SWPM 20-10-15, BOTH CONDUCTORS NOW HAVE NO CONTINUITY TO SHIELD. REINSTALLED AND TESTED APU ECU, TEST PASS. OBSERVED STEADY APU OIL TEMP OF 78C WITH FLUCTUATING LOADS AND PACK OPERATION. THIS CLEARS TSR.