Service difficulty report · Monitor · Boeing 777222

Difficulty date
May 7, 2012
Submitted
July 10, 2012
Operation
Air carrier
Aircraft
N785UA
Make and model
Boeing 777222
Aircraft serial
26954
Aircraft time
66,964 hours, 9,522 cycles
Engine
Pwa PW40903
Part
Monitor
Part number
285W0037101
Condition
Faulty
Location
Wai System
Stage of operation
NR
How discovered
9
Nature of condition
J
Precautionary procedure
O

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

What was found

STATUS MESSAGE WAI CARD REPEAT GRIPE. TRIED TO RESET WAI CARD, NO HELP. UNABLE TO RUN WAI SYSTEM TEST VIA MAT. CAN NOT COMMUNICATE WITH CARD. SUSPECT BAD ACIPS OR LINEAR MONITOR (A3) AT P84. NO TIME TO FURTHER TROUBLESHOT, BOTH WAI VALVES DEACTIVATED. MAT SHOWS MAINTENANCE MESSAGE 31-14 023, LINEAR-MONITOR 1 RSCF P084A03. SWAPPED RSCF AND LSCF A03'S CARDS PER MM31-09-01 PG 401 AND WAI SYSTEM MESSAGE CLEARED AND WAI SYSTEM GROUND TEST PASSED ON MAT 147121ACC TO AMM31-09-00 RSCF (P84) A03 LIN REG 4 POWERS A7 C ACIPS WHILE ON LSCF (P85) IT POWERS A07 SPARE CARD. NO DISCREPANCIES FOUND SUSPECT BAD LINEAR MONITOR.