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SDR ASAA12511029

Open the Markdown

Service difficulty report · Unknown · Boeing 737890

FAA SDR system

Difficulty date
January 31, 2012
Submitted
February 3, 2012
Operation
Air carrier
Aircraft
N570AS
Make and model
Boeing 737890
Aircraft serial
35185
Aircraft time
19,002 hours, 5,716 cycles
System (JASC)
2420 · AC Generation System
Part
Unknown
Condition
Malfunctioned
Location
Electrical Sys
Part time
39,819 hours, 15,895 cycles
Stage of operation
TX
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

DURING TAXI IN AFTER LANDING BOTH ENGINES RUNNING APU GEN POWER DROPPED OFF LINE. RE-ESTABLISHED GEN BUS NR 1 & 2 THEN RE-ESTABLISHED APU GEN POWER. APU GEN THEN AGAIN DROPPED OFF LINE VOLTS =0 FREQS=0 SO WE SHUT APU OFF. ALL CIRCUIT BREAKERS IN. CONFIRMED NO VOLT/AMP FROM APU. APU PWR BUS LIGHT OFF IS "ON". PERF BITE 49 60 00 810 801 NO CURRENT FAULTS. HISTORY SHOWS FAULT 49 11019. GCU BITE TASK 24 21 00 810 801 SHOWS NO FAULTS. ACCOMPLISHED FIM 24 21 00 810 801 & FIM TASK 49 15 00 810 804. NO FAULTS FOUND. PRECAUTIONARY REPLACED APU REMOTE FIRE CONTROL PANEL REF AMM 26 22 03 & OPS NML REF SAME. OPS TEST FOR THE AC GENERATION & CONTROL SYSTEM CHECKED GOOD REF AMM 24 21 00.