SDR ASAA2014101409384

Service difficulty report · Warning Light · Boeing 737890

Difficulty date: October 14, 2014
Submitted: October 21, 2014
Operation: Air carrier
Aircraft: N536AS
Make and model: Boeing 737890
Aircraft serial: 35203
Aircraft time: 10,861 hours, 3,183 cycles
System (JASC): 4940 · APU Start/Ignition System
Part: Warning Light
Condition: False Activation
Location: Apu
Stage of operation: TX
How discovered: O
Nature of condition: N
Precautionary procedure: O

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

What was found

APU FAULT LIGHT ILLUMINATED DURING START. ACFT GROUNDED. INTERROGATED CPU, FOUND FAULT CODE 49-41251, START CONVERTER UNIT SHOWS HIGH TEMP. NO HISTORY LAST 90 DAYS. ACCOMPLISH TASK 49-40, TASK 812, THROUGH STEP E. 4, 2 TIMES. DID NOT GET EITHER FAULT CODE 49-41251 OR 49-41256. PERFORMED 2 COMPLETE APU STARTS ALL INDICATIONS NORMAL NO FAULTS. IAW TASK DETERMINED TO BE INTERMITTENT FAULT.