SDR ASAA2016051816794

Service difficulty report · Exciter · Boeing 737890

Difficulty date: May 18, 2016
Submitted: May 20, 2016
Operation: Air carrier
Aircraft: N597AS
Make and model: Boeing 737890
Aircraft serial: 35689
Aircraft time: 31,113 hours, 9,579 cycles
System (JASC): 4940 · APU Start/Ignition System
Part: Exciter
Part number: 38880587
Part serial: 1016250400978
Condition: Failed
Location: Apu
Part time: 6,037 hours, 9,352 cycles
Stage of operation: TX
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

ON FIRST APU START ATTEMPT AT GATE GOT APU FAULT LIGHT. ACFT GROUNDED. CONFIRMED FAULT, APU WILL NOT START. APU BITE SHOWS FAULT MESSAGE 49-41180, IGNITION UNIT CIRCUIT HIGH CURRENT". ACCOMPLISHED FIM 49-40, TASK 804, TROUBLESHOT TO DEFECTIVE APU EXCITER UNIT. R & R APU EXCITER UNIT REF AMM 49-41-31, GROUND VERIFICATION TEST SUCCESSFUL.