Service difficulty report · Pressure Switch · Boeing 777222

Difficulty date
September 2, 2009
Submitted
September 4, 2009
Operation
Air carrier
Aircraft
N797UA
Make and model
Boeing 777222
Aircraft serial
26924
Aircraft time
51,225 hours, 7,408 cycles
Engine
Pwa PW40903
Part
Pressure Switch
Part number
21SN04459
Part serial
CSGCA34835
Condition
Faulty
Location
Oil System
Stage of operation
NR
How discovered
9
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. DETECTOR FOR PRESENCE OF SOLID CONTAMINANTS NORMAL AND CONTAMINATION IS WITHIN LIMITS. ALSO NO LEAK EXISTED WITH ENG RUN. MOST COMMON CAUSE OF MSG 7960862 IS OIL FILTER DP SWITCH. INSTALLED NEW OIL FILTER PRESS SWITCH. CALL OUT OIL FILTER ALSO CHANGED. NO CONTAMINANTS NOTED. IDLE RAN ENGINE. NO FAULTS NOTED. CHECKED CHIP DETECTORS, NO CONTAMINANTS NOTED.