SDR ASAA2019092493790

Service difficulty report · Apu · Boeing 737890

Difficulty date: September 19, 2019
Submitted: October 9, 2019
Operation: Air carrier
Aircraft: N535AS
Make and model: Boeing 737890
Aircraft serial: 35200
Aircraft time: 33,895 hours, 9,814 cycles
System (JASC): 4900 · Airborne Auxiliary Power Unit (APU) System
Part: Apu
Condition: Warning Light
Stage of operation: LD
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

AFTER LANDING, TRIED TO START APU BUT GOT THE FAULT LIGHT. TURNED APU SWITCH OFF. TRIED TO START AGAIN WITH SAME RESULT. ON THIRD ATTEMPT, APU STARTED NORMALLY. GROUNDED - YES. PERFORMED APU BITE TEST IAW B737-800 FIM 49-60-TASK 801. NO FAULT FOUND. PLACARD APU ON MEL 49-99A. APU IS ON CONTINUOUS RUN OPERATIONS. PER SEAMC SUCCESSFUL APU CSSP NOTED & IS NOW OK TO CLEAR MEL 49-99A. MEL 49-99A CLEARED, PLACARD REMOVED.