Service difficulty report · Sensor · Boeing 777222

Difficulty date
September 2, 2013
Submitted
September 5, 2013
Operation
Air carrier
Aircraft
N219UA
Make and model
Boeing 777222
Aircraft serial
30551
Aircraft time
53,559 hours, 6,478 cycles
Engine
Pwa PW40903
Part
Sensor
Part serial
R8A
Condition
Failed
Location
Flap Slat
Stage of operation
IN
How discovered
O
Nature of condition
O
Precautionary procedure
K

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

What was found

FLAP-SLAT SKEW SENSORS FAILURE OF ONE OR MORE SLAT & OR FLAP SKEW DETECTION SENSORS. LOSS OF SLAT & OR FLAP SKEW DETECTION SENSOR REDUNDANCY. STATUS MSG-2720351 ACTIVE CL INTER, MSG-2720351 INACTV CL INTER. REPLACED SENSOR R8A PER AMM. TEST IAW AMM, TESTED OK. NO MSG. MAINT TEXT: MAT FAULTS SNSR 8A...OUTPUT IS MARGINAL. AS READING DROPS TO -6.95 STATUS MESSAGE APPEARS. PRINTOUT IS UNDER COCKPIT HANDSET. REF WDM 27-59-13 P3, FOUND BREAK IN WIRE NEAR DM27324 FLAP SKEW SNSR R7A. AFTER REMOVING DAMAGED AREA, WIRE NOW TOO SHORT. WILL NEED TO REPLACE W8478-200 3B & R. SUGGEST REPL CONNECTOR DUE TO EXCESSIVE GREASE INSIDE.