Service difficulty report · Valve · Lear 60LEAR

Difficulty date
September 1, 2010
Submitted
September 3, 2010
Operation
Air carrier
Aircraft
N154AK
Make and model
Lear 60LEAR
Aircraft serial
114
Aircraft time
4,421 hours, 2,641 cycles
Engine
Pwa PW305A
Engine time
4,421 hours, 2,641 cycles
Part
Valve
Condition
Defective
Location
Lt Engine
Stage of operation
CR
How discovered
O
Nature of condition
X
Precautionary procedure
H

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

What was found

LT ENGINE OIL PRESS LIGHT ILLUMINATED, ENGINE ROLL BACK TO 35 PERCENT N1, SWITCHED OFF ENGINE SYNC, N1 RETURNED TO 55 PERCENT AND OIL PRESSURE INCREASED AND SETTLED IN GREEN ARC BUT 10 PSI BELOW NORMAL. ENGINE COMPUTER DOWNLOADED, OEM ANALYZED AND REPORTED DOWNLOAD DATA INDICATES POSSIBLE ENGINE FLAME OUT DUE TO LOSS OF AIR PRESSURE. REPLACEMENT OF LT ENGINE ALL THREE AIR PRESSURE BLOW OFF VALVES PER OEM RECOMMENDATIONS IN PROGRESS AT THIS TIME.