Service difficulty report · Shutoff Valve · Boeing 777222

Difficulty date
September 10, 2009
Submitted
September 11, 2009
Operation
Air carrier
Aircraft
N204UA
Make and model
Boeing 777222
Aircraft serial
28713
Aircraft time
47,728 hours, 6,850 cycles
Engine
Pwa PW40903
Part
Shutoff Valve
Part number
32907706
Part serial
105
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

BLEED VALVE APU APU BLEED VALVE DISAGREES WITH COMMANDED POSITION. STATUS MSG-3610130 LATCHD DC MODE MSG-3610130 ACTIVE DC MODE. MSG NBR 36-10130. RPL'D APU S-OFF VLV AND TEST PASSED. BUT MSG NOT GONE. CLN'D CONNECTOR, ACPD FIM 36-12(806) NO HELP. MAT TEST R-A-S SHOWS FAILED MESG 36-10120 APU S-V SOLENOID OR RVDT OPEN OR SHORTED. WHEN APU RUNNING, DUCT PRESSURE NORMAL AND APU BLD POS SYMBOL IS BLANK ON AIR PAGE. ASCPC SWAP CHECK FOUND RT ASCPC HAS A FAULT. INSTALLED APU SHUT OFF VLV. APU BLEED SYSTEM OPS NORMAL.