SDR ASAA2019072230159

Service difficulty report · Unknown · Boeing 737990ER

Difficulty date: July 22, 2019
Submitted: July 24, 2019
Operation: Air carrier
Aircraft: N448AS
Make and model: Boeing 737990ER
Aircraft serial: 36356
Aircraft time: 13,299 hours, 4,341 cycles
System (JASC): 2420 · AC Generation System
Part: Unknown
Condition: Malfunctioned
Location: Electrical Sys
Stage of operation: IN
How discovered: O
Nature of condition: O
Precautionary procedure: K

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

What was found

APU ELECTRIC POWER INOP. GROUNDED - YES. PERFORMED OPERATIONAL TEST FOR AC GENERATION AND CONTROL SYSTEM REF AMM 24-21-00-700-803. OPS CKS GOOD NO FAULTS. VISUALLY EXAMINED (GVI) OF APU COMPARTMENT AND HARNESSES. NO FAULTS FOUND. PERFORMED APU BITE LOOKING FOR RECENT OR CURRENT MAINT MSG'S. MOST RECENT MSG IS 400+ STARTS IN HISTORY. REF FIM 49-60 TASK 801. OPS CKS GOOD. ETOPS SIGNIFICANT SYSTEM GROUND VERIFICATION SUCCESSFUL.