SDR ASAA2019082873522

Service difficulty report · Warning Message · Boeing 737890

Difficulty date: August 27, 2019
Submitted: August 28, 2019
Operation: Air carrier
Aircraft: N581AS
Make and model: Boeing 737890
Aircraft serial: 35188
Aircraft time: 46,811 hours, 14,000 cycles
System (JASC): 4940 · APU Start/Ignition System
Part: Warning Message
Condition: False Activation
Location: Apu
Part time: 13,553 hours, 4,267 cycles
Stage of operation: IN
How discovered: O
Nature of condition: N
Precautionary procedure: K

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

What was found

MECH'S REPORT AFTER APU START/SHUTDOWN, CURRENT STATUS AND MAINT MESSAGE START 0 SHOWS FAULT " START POWER UNIT SHOWS HIGH TEMPERATURE - 49-41255". GROUNDED - YES. PERFORMED B737-800 FIM 49-40 TASK 815 - INITIAL EVALUATION APU START/RUN/STOP VERIFIES DISCREP. REF B737-800 AMM 49-41-71, REMOVED/REPLACED START POWER UNIT. OPS NML REF SAME AND REPERFORMED APU BITE PROCEDURE AMM TASK 49-61-00-700-801. CURRENT STATUS SHOWS "NO FAULTS FOUND." GROUND VERIFICATION TEST GOOD. A/C MAIN BATTERIES OPS NML REF AMM 24-31-11.