Service difficulty report · Wire · Boeing 74747UF

Difficulty date
June 6, 2020
Submitted
June 10, 2020
Operation
Air carrier
Aircraft
N496MC
Make and model
Boeing 74747UF
Aircraft serial
29257
Aircraft time
82,485 hours, 13,672 cycles
Part
Wire
Part number
W724200820
Condition
Broken
Location
Apu Ignition
Stage of operation
IN
How discovered
9
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

FAULT HISTORY REPORT FOUND APU IGNITION UNIT STUCK ENERGIZED CMC MSG: 49078. IAW FIM 49-11 TASK 879 REV 98 AND WDM 49-11-16 REV 48 AND SSM 49-11-01 REV 48 PERFORMED WIRE CONTINUITY AND INSULATION CHECK. FOUND WIRE W7242-008-20 BROKEN. IAW SWPM 20-30-11 REV 13 AND SWPM 20-03-19 REV 73 AND WDM 49-11-16 REV 48, REPLACED W7242-008-20. IAW WDM 49-11-16 REV 48 PERFORMED COND CHECK AND RESULT WAS SATISFACTORY. IAW AMM 49-11-00-705-017 REV 98 PERFORMED GROUND TEST OF APU AND RESULT WAS SATISFACTORY.

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