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SDR UALA2008122206951

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Service difficulty report · Pressure Switch · Boeing 777222

FAA SDR system

Difficulty date
December 22, 2008
Submitted
December 23, 2008
Operation
Air carrier
Aircraft
N798UA
Make and model
Boeing 777222
Aircraft serial
26928
Aircraft time
47,312 hours, 7,040 cycles
Engine
Pwa PW40903
Engine time
38,851 hours, 5,504 cycles
System (JASC)
7931 · Engine Oil Pressure
Part
Pressure Switch
Condition
Failed
Location
Lt Engine
Part time
38,851 hours, 5,504 cycles
Stage of operation
IN
How discovered
O
Nature of condition
W
Precautionary procedure
O

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

What was found

ENGINE OIL FILTER SENSOR L THE PRESSURE SWITCH FOR DETECTING IMPENDING OIL FILTER BYPASS ON THE LEFT ENGINE HAS FAILED. STATUS MSG01- ACTIVE CRUISE MODE DEPENDENT; SWITCH POSITION SIGNAL FROM OIL FILTER DIFFRNTL PRESS SW (L ENG) CHANNEL A AND B DO NOT AGREE. DB- ELECTRONIC ENGINE CONTROL (L ENG, CH A) MSG02- ACTIVE CRUISE MODE DEPENDENT; SWITCH POSITION SIGNAL FROM OIL FILTER DIFFERENTIAL PRESS SW (L ENG) CHANNEL A AND B DO NOT AGREE. MSG-7960861 ACTIVE ER MODE MSG-7960861 ACTIVE ER MODE. ACP'D FIM 79-35 801-802. NO ACTIVE MESSAGE PRESENT. DPI DID NOT POP, INSPECTED & REPLACED MAIN OIL FILTER (P/N ACC434F65).