SDR ASAA2017102722349

Service difficulty report · Generator · Boeing 737890

Difficulty date: October 27, 2017
Submitted: October 30, 2017
Operation: Air carrier
Aircraft: N596AS
Make and model: Boeing 737890
Aircraft serial: 35688
Aircraft time: 36,215 hours, 11,043 cycles
System (JASC): 2421 · AC Generator-Alternator
Part: Generator
Condition: Malfunctioned
Location: Apu
Stage of operation: NR
How discovered: 9
Nature of condition: O
Precautionary procedure: O

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

What was found

APU STARTS, BLEED AIR AVAILABLE BUT APU GENERATOR WILL NOT COME ONLINE NO VOLTS OR FREQUENCIES. ACFT GROUNDED. INTERROGATED THE APU GENERATOR CONTROL UNIT IAW FIM 24-21, TASK 801. BITE TEST PASSED, NO FAULTS. IAW FIM 24-21, TASK 820. PERFORMED APU OPS TEST FOR THE AC GENERATOR SYS & AMM 24-21-00-700-803. APU GENERATOR OPS TESTED NORMAL, NO FAULTS.