Service difficulty report · Warning System · Boeing 747422

Difficulty date
December 30, 2013
Submitted
January 2, 2014
Operation
Air carrier
Aircraft
N128UA
Make and model
Boeing 747422
Aircraft serial
30023
Aircraft time
55,960 hours, 6,475 cycles
Engine
Pwa PW4056
Part
Warning System
Condition
False Activation
Location
Cockpit
Stage of operation
NR
How discovered
O
Nature of condition
N
Precautionary procedure
O

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

What was found

GEAR MONITOR EICAS STATUS MESSAGE DISPLAYED. PRI & ALT LG POSITION INDICATION DISAGREE. SELECTED LG MX MESSAGE OR LOSS OF EITHER PSEU BUS OR SELECTED PSEU FAULT. FOUND CMC MX MESSAGE 32718 & 32678 DISPLAYED AS AN INACTIVE INTERMITTENT FAULT AT CLIMB. CONFIRMED TARGET SENSOR CLEARANCE NORMAL & PERFORMED BODY GEAR DOOR WARNING SENSOR TEST IAW AMM 32-61-31. NO PREVIOUS 25577 HISTORY, BODY GEAR INDICATION SYS SERVICEABLE.