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SDR UALA2009102003270

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Service difficulty report · Control System · Boeing 777222

FAA SDR system

Difficulty date
October 20, 2009
Submitted
October 21, 2009
Operation
Air carrier
Aircraft
N226UA
Make and model
Boeing 777222
Aircraft serial
30226
Aircraft time
31,829 hours, 3,925 cycles
Engine
Pwa PW40903
System (JASC)
4960 · APU Controls
Part
Control System
Part number
S351W200100
Part serial
1
Condition
Malfunctioned
Location
Apu
Stage of operation
NR
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 DOOR APU INLET DOOR IS NOT IN COMMANDED POSITION. STATUS CREW COMMENTS: ON INTERMITTENTLY MSG-4917001 ACTIVE ES MODE, MSG-4914110 ACTIVE ES MODE. POSSIBLE CAUSES INCLUDE RELAY (APU INLET DOOR CONTROL) IN P310, K49001 (P310), I-O CARD (6) IN P310,M24406A9, FILTER CARD (3) IN P310, M24406A18, (102193) 100 PERCENT FIX 3 OF 3 AND SIGNAL CONDITIONING CARD (2) TYPE C IN P310, M24411. FAULT HAS HISTORY OF 14+ W-U'S. MAINT MSG 49-14110 LATCHED AND UNABLE TO UNLATCH. REPLACED APUC AND APU OPERATIONS TESTED NORMAL. STATUS MSG GONE AND NO MAINT MSG ON MAT.