SDR ASAA2014072208647

Service difficulty report · Warning Message · Boeing 737890

Difficulty date: July 22, 2014
Submitted: July 25, 2014
Operation: Air carrier
Aircraft: N536AS
Make and model: Boeing 737890
Aircraft serial: 35203
Aircraft time: 10,017 hours, 2,899 cycles
System (JASC): 4900 · Airborne Auxiliary Power Unit (APU) System
Part: Warning Message
Condition: False Activation
Location: Apu
Stage of operation: TX
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

MAINTENANCE MESSAGE 49-37168 ON CURRENT STATUS PAGE. ACFT GROUNDED. VISUALLY INSPECTED APU HARNESS AND AC WIRING. DISCONNECTED AND INSPECTED P22 FCU. MEASURED RESISTANCE PINS 4 TO 5 = 110 OHMS. RECONNECTED P22 AND REACCOMPLISHED APU BITE-FAULT CLEARED.