CL600 flight crew experiences fluctuating oil pressure with eventual loss of oil pressure on the rig...

Narrative:

As we were climbing through the mid-20's we started to notice that the right oil pressure gauge was fluctuating. It was still in the normal operating range and all other engine indications where normal. We were cleared to FL370; upon reaching FL370 and in cruise we started to notice that the right oil pressure gauge was still fluctuating but more into the yellow and red but up and down from green to red. Within a few minutes the right oil pressure started to fluctuate in the red and yellow only to eventually go red then disappear with the illumination of the 'lop' light (low oil pressure). We proceeded to the checklist and were starting to discuss an airport to divert to after we would shutdown the engine per the checklist. During this time the engine made a deep growl sound. I retarded the throttle and the growl went away and the oil pressure 'lop' light momentarily extinguished and the oil pressure rose into the yellow then green. I advanced the throttle and only momentarily did the oil pressure stay then dropped again with the illumination of the 'lop' light and follow by a bang and the engine spooling down. At that point we declared an emergency and center told us a suitable airport was 130 miles away. We asked for a heading and a descent while we programmed our FMS. ATC gave us a heading and we descended and went through the necessary checklist to secure the engine and systems for landing. We declined emergency equipment. The weather was VFR and we descended to enter a wide left downwind/left base for runway 4. We landed without incident.

Original NASA ASRS Text

Title: CL600 Flight Crew experiences fluctuating oil pressure with eventual loss of oil pressure on the right engine. Engine is shut down and flight diverts to nearest suitable airport.

Narrative: As we were climbing through the mid-20's we started to notice that the Right oil pressure gauge was fluctuating. It was still in the normal operating range and all other engine indications where normal. We were cleared to FL370; upon reaching FL370 and in cruise we started to notice that the Right oil pressure gauge was still fluctuating but more into the yellow and red but up and down from green to red. Within a few minutes the Right oil pressure started to fluctuate in the red and yellow only to eventually go red then disappear with the illumination of the 'LOP' light (low oil pressure). We proceeded to the checklist and were starting to discuss an airport to divert to after we would shutdown the engine per the checklist. During this time the engine made a deep growl sound. I retarded the throttle and the growl went away and the oil pressure 'LOP' light momentarily extinguished and the oil pressure rose into the yellow then green. I advanced the throttle and only momentarily did the oil pressure stay then dropped again with the illumination of the 'LOP' light and follow by a bang and the engine spooling down. At that point we declared an emergency and Center told us a suitable airport was 130 miles away. We asked for a heading and a descent while we programmed our FMS. ATC gave us a heading and we descended and went through the necessary checklist to secure the engine and systems for landing. We declined emergency equipment. The weather was VFR and we descended to enter a wide left downwind/left base for runway 4. We landed without incident.

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	854757
Time
Date	200910
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Challenger CL600
Operating Under FAR Part	Part 91
Flight Phase	Cruise
Route In Use	Direct
Flight Plan	IFR
Component
Aircraft Component	Turbine Engine
Person 1
Function	Pilot Flying First Officer
Qualification	Flight Crew Instrument Flight Crew Air Transport Pilot (ATP) Flight Crew Multiengine
Experience	Flight Crew Last 90 Days 64.2 Flight Crew Total 7807.1 Flight Crew Type 200
Person 2
Function	Captain Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 35 Flight Crew Total 10200 Flight Crew Type 2200
Events
Anomaly	Aircraft Equipment Problem Critical

CL600 flight crew experiences fluctuating oil pressure with eventual loss of oil pressure on the right engine. Engine is shut down and flight diverts to nearest suitable airport.