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SDR CALA2013111292830

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Service difficulty report · Controller · Boeing 777222

FAA SDR system

Difficulty date
November 11, 2013
Submitted
November 14, 2013
Operation
Air carrier
Aircraft
N791UA
Make and model
Boeing 777222
Aircraft serial
26933
Aircraft time
70,028 hours, 10,033 cycles
Engine
Pwa PW4090
System (JASC)
4960 · APU Controls
Part
Controller
Part number
S351W200100
Part serial
67
Condition
Faulty
Location
Apu
Stage of operation
IN
How discovered
O
Nature of condition
O
Precautionary procedure
O

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

What was found

APU APUC DETECTED FAULT THAT WOULD CAUSE AUTOMATIC SHUTDOWN OF APU IN UNATTENDED MODE OPERATION, OR COMPLETE LOSS OF APUC BUS ACTIVITY BOTH LT & RT 629 FOR 3 SECONDS AFTER THE APU MASTER CONTROL SWITCH HAS BEEN IN THE ON POSITION FOR TEN SECONDS. STATUS MESSAGE G01 NOT ACTIVE CRUISE MODE DEPENDENT. APU CONTROLLER APUC FLOW SENSING SYSTEM INDICATES LOW FLOW, CAUSED AUTO SHUTDOWN. DB APU CONTROLLER APUC MESSAGE 4911110 INACTV ER MODE. REPLACED APUC IAW MM & OPERATIONS CHECKED OKAY.