Service difficulty report · Pressure Switch · Boeing 777222

Difficulty date
May 6, 2011
Submitted
May 12, 2011
Operation
Air carrier
Aircraft
N794UA
Make and model
Boeing 777222
Aircraft serial
26953
Aircraft time
60,055 hours, 8,642 cycles
Engine
Pwa PW40903
Part
Pressure Switch
Part number
21SN04459
Part serial
178
Condition
Failed
Location
Oil System
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

ENG OIL FILT SNSR R THE PRESSURE SWITCH FOR DETECTING IMPENDING OIL FILTER BYPASS ON THE RIGHT ENGINE HAS FAILED. NO TIME TO T-S, MSG 79-608 62 LATCHED. MAG TIP FOUND CLEAN AND NO LEAK NOTED. CHECKED OIL FILTER TO BE SURE NOT CLOGGED. ENG WAS JUST INSTALLED SO LOOKING FOR LOOSE CONNECTOR BETWEEN OIL FILT DP SWITCH AND EEC. CK DS79001 AT DP SWITCH TO MAKE SURE ONLY ONE GROMMET & GOOD SOCKET TENSION AND LOCKING MECHANISM. IF NOTHING FOUND WILL REPLACE DP SWITCH. REPLACED DIFF PRESS SW AND MAIN OIL FILTER. RAN ENG OPS AND LEAKS OKAY.