An lr-45 first officer reported low oil pressure in left engine in cruise flight. Flight crew follow...

Narrative:

While in cruise flight an intermittent left engine low oil pressure message/light occurred. The left engine oil pressure was indicating 53-65 psi with an amber box around the oil pressure read out. The pilot not flying (the captain) read the QRH. The QRH indicated to leave engine in idle; and land as soon as practical. We diverted to [nearest suitable airport] and landed using the QRH single engine landing procedure. After landing the oil pressure indication turned red so the left engine was shutdown. After we were in the chocks; both pilots checked that the left engine oil dipstick was still properly secured; and it was; i.e. The dipstick cap was not improperly secured or left off on the preflight. Leaking oil was present primarily on the inboard portion of the engine cowling; with some from the oil door and the outboard side.

Original NASA ASRS Text

Title: An LR-45 First Officer reported low oil pressure in left engine in cruise flight. Flight crew followed QRH and diverted to nearest suitable airport with the engine in idle. After landing; oil pressure dropped further and the engine was shut down.

Narrative: While in cruise flight an intermittent left engine LOW OIL PRESSURE message/light occurred. The left engine oil pressure was indicating 53-65 PSI with an amber box around the oil pressure read out. The pilot not flying (the Captain) read the QRH. The QRH indicated to leave engine in idle; and land as soon as practical. We diverted to [nearest suitable airport] and landed using the QRH single engine landing procedure. After landing the oil pressure indication turned RED so the left engine was shutdown. After we were in the chocks; both pilots checked that the left engine oil dipstick was still properly secured; and it was; i.e. the dipstick cap was NOT improperly secured or left off on the preflight. Leaking oil was present primarily on the inboard portion of the engine cowling; with some from the oil door and the outboard side.

Data retrieved from NASA's ASRS site as of April 2012 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.

Attributes
ACN	930379
Time
Date	201101
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.ARTCC
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Learjet 45
Operating Under FAR Part	Part 91
Flight Phase	Cruise
Flight Plan	IFR
Component
Aircraft Component	Turbine Engine
Person 1
Function	Pilot Flying First Officer
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Critical

An lr-45 first officer reported low oil pressure in left engine in cruise flight. Flight crew followed QRH and diverted to nearest suitable airport with the engine in idle. After landing; oil pressure dropped further and the engine was shut down.