Service difficulty report · Pcu · Boeing 777222

Difficulty date
December 22, 1999
Submitted
October 9, 2000
Operation
Air carrier
Aircraft
N774UA
Make and model
Boeing 777222
Aircraft serial
26936
Aircraft time
16,267 hours, 3,979 cycles
Engine
Pwa PW4077
Part
Pcu
Part number
B435413
Part serial
0341
Condition
Failed
Location
Ailerons
Part time
16,267 hours, 3,979 cycles
Stage of operation
CR
How discovered
O
Nature of condition
F
Precautionary procedure
O

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

What was found

RIGHT OUTBORAD SPOILER (NR 14) IN THE DEPLOYED POSITION. AILERONS REQUIRE ONE UNIT OF TRIM. *S/D* MAINTENANCE MESSAGE 27-11513 SPOILER PCU NR 14 POSTION TRANSDUCER HAS FEEDBACK FAULT WAS ACTIVE. SPOILER PCU NR 14 (P/N: B43541-3) WAS REPLACED AND TESTED PER AMM 27-61-08. SUSPECT A FAILURE OF THE POSITION TRANSDUCER LVDT AND POTTING COMPOUND. THIS IS A SUBJECT OF A VENDER SERVICE BULLETIN AND THE MODFICATION WILL BE ACCOMPLISHED.