SDR ASAA2016112018767

Service difficulty report · Warning Light · Boeing 737990ER

Difficulty date: November 20, 2016
Submitted: November 22, 2016
Operation: Air carrier
Aircraft: N477AS
Make and model: Boeing 737990ER
Aircraft serial: 40716
Aircraft time: 5,890 hours, 1,914 cycles
System (JASC): 4900 · Airborne Auxiliary Power Unit (APU) System
Part: Warning Light
Condition: False Activation
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

DURING APU START THE APU FAULT LIGHT ILLUMINATED. ACFT GROUNDED. FOUND FAULT 49-41254 WHILE PERFORMING APU BITE, IAW FIM 49-40 TASK 821. CHECK APU BITE CURRENT STATUS FOR FAULT. FAULT NOT FOUND UNDER CURRENT STATUS, IAW FIM TASK 49-40 821, FAULT INTERMITTENT.