MD88 crew had the oil filter clog light illuminate in ZID class a airspace.

Attributes
ACN	593735
Time
Date	200309
Day	Tue
Local Time Of Day	1801 To 2400
Place
Locale Reference	navaid : cvg.vortac
State Reference	KY
Altitude	msl single value : 33000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zid.artcc
Operator	common carrier : air carrier
Make Model Name	MD-88
Operating Under FAR Part	Part 121
Flight Phase	cruise : level
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : commercial pilot : flight engineer pilot : atp
Experience	flight time last 90 days : 210 flight time total : 14100 flight time type : 3610
ASRS Report	593735
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : oil filter clog light on other flight crewa other flight crewb
Resolutory Action	controller : provided flight assist controller : issued new clearance flight crew : declared emergency flight crew : diverted to another airport flight crew : landed in emergency condition other
Consequence	other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

We received a warning message for the right engine indicating the oil strainer was clogged. I opened our procedure manual and verified the appropriate checklist with the first officer. The checklist told us to retard throttle until the light goes out. About 1/2 inch from idle, the light went out. After 30 seconds, the light came back on, so I retarded the throttle to idle. At this time the airspeed was decaying and the first officer was unable to maintain altitude, so I declared an emergency. Center cleared us to FL240. We descended towards FL240 and I asked to divert to cvg. After turning towards the field, I requested the emergency trucks stand by. We continued for an uneventful landing at cvg. After clearing the runway, I secured the right engine and proceeded single engine taxi to the gate.

Original NASA ASRS Text

Title: MD88 CREW HAD THE OIL FILTER CLOG LIGHT ILLUMINATE IN ZID CLASS A AIRSPACE.

Narrative: WE RECEIVED A WARNING MESSAGE FOR THE R ENG INDICATING THE OIL STRAINER WAS CLOGGED. I OPENED OUR PROC MANUAL AND VERIFIED THE APPROPRIATE CHKLIST WITH THE FO. THE CHKLIST TOLD US TO RETARD THROTTLE UNTIL THE LIGHT GOES OUT. ABOUT 1/2 INCH FROM IDLE, THE LIGHT WENT OUT. AFTER 30 SECONDS, THE LIGHT CAME BACK ON, SO I RETARDED THE THROTTLE TO IDLE. AT THIS TIME THE AIRSPD WAS DECAYING AND THE FO WAS UNABLE TO MAINTAIN ALT, SO I DECLARED AN EMER. CTR CLRED US TO FL240. WE DSNDED TOWARDS FL240 AND I ASKED TO DIVERT TO CVG. AFTER TURNING TOWARDS THE FIELD, I REQUESTED THE EMER TRUCKS STAND BY. WE CONTINUED FOR AN UNEVENTFUL LNDG AT CVG. AFTER CLRING THE RWY, I SECURED THE R ENG AND PROCEEDED SINGLE ENG TAXI TO THE GATE.

Data retrieved from NASA's ASRS site as of July 2007 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.