Service difficulty report · Transducer · Boeing 777222

Difficulty date
February 10, 2012
Submitted
February 16, 2012
Operation
Air carrier
Aircraft
N772UA
Make and model
Boeing 777222
Aircraft serial
26930
Aircraft time
66,114 hours, 11,973 cycles
Engine
Pwa PW4077
Part
Transducer
Part number
PTX30080093
Part serial
624
Condition
Faulty
Location
Hydraulic Sys
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

C2 PUMP PRESS OUT-RANGE AHM IS HITTING ON ALL LEGS FOR MSG 29-10570, ACMP C2 OUTPUT PRESSURE IS OUT OF RANGE. THIS IS ONE OF 2 A-C IN FLEET WITH MSG AND CAN LEAD TO EXCESSIVE CYCLING OF ADU AND CATASTROPHIC FAILURE. REF FIM 29-11, TASK 898. INITIATE T/S IN PARA C AND AS A MINIMUM CK AC C-2 PUMP CONNECTOR FOR CORROSION, ARCING A CONDITION. CHECK FILTER DELTA P HAS NOT POPPED AND SWAP HYDUM CARD WITH C-1. MAY CONSIDER REPLACING PRESSURE XDUCER M29317. PCN 566-0603. DO NOT RPL THE ACMP UNLESS THERE ARE POSITIVE FINDINGS. FOUND PRESSURE FOR ACMP 2 HIGH 3340 PSI TEMP OK. RPL'D PRESS TRANSDUCER. M29317 AFTER REPLACEMENT OF PRESS TRANS PRESS WITHIN LIMITS. CHK'D ALL CONNECTORS FOUND OKAY.