SDR ASAA2016022915700

Service difficulty report · Apu · Boeing 737890

Difficulty date: February 29, 2016
Submitted: March 2, 2016
Operation: Air carrier
Aircraft: N535AS
Make and model: Boeing 737890
Aircraft serial: 35200
Aircraft time: 20,322 hours, 5,913 cycles
System (JASC): 4900 · Airborne Auxiliary Power Unit (APU) System
Part: Apu
Condition: Malfunctioned
Stage of operation: CL
How discovered: O
Nature of condition: J
Precautionary procedure: O

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

What was found

IN CLIMB, DISCOVERED APU RUNNING WITH APU START SWITCH OFF. CYCLED APU SWITCH TO ON THEN OFF. APU SHUTDOWN NORMALLY. STARTED APU IN FLIGHT, NORMAL START GOOD. ACFT GROUNDED. RESET POWER FOR ACFT. VERIFIED APU SWITCH CONTACTS ARE SECURED. VERIFIED SWITCH POSITION THRU INPUT MONITORING. SUCCESSFUL APU STARTS AND SHUTDOWNS REF AMM 49-61-00, 49-11-00. APU SHOWS NO CURRENT FAULTS.