SDR ASAA2015112413995

Service difficulty report · Warning Light · Boeing 737890

Difficulty date: November 24, 2015
Submitted: December 1, 2015
Operation: Air carrier
Aircraft: N568AS
Make and model: Boeing 737890
Aircraft serial: 35183
Aircraft time: 33,771 hours, 10,432 cycles
System (JASC): 4940 · APU Start/Ignition System
Part: Warning Light
Condition: False Activation
Location: Apu
Stage of operation: NR
How discovered: 9
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

APU FAULT LIGHT ILLUMINATED. ACFT GROUNDED. ACCOMPLISHED APU BITE PROCEDURE REF FIM TASK 49-60, TASK 801. SHOWED FAULT CODE 49-41245, START CONVERTER UNIT SHOWS GENERATOR UNDER VOLTAGE. PERFORMED START CONVERTER UNIT SHOWS GEN UNDER VOLTAGE FAULT ISOLATION NO DEFECTS NOTED REF FIM TASK 49-40, TASK 807. ACCOMPLISHED APU OPS TEST GROUND VERIFICATION TEST PASS REF AMM 49-11-00. APU OPS CK NORMAL. ACCOMPLISHED APU BITE PROCEDURE AGAIN CURRENT STATUS PAGE AND MAINT HISTORY PAGE SHOWED NO NEW FAULTS.