Oil filter clogging.

Attributes
ACN	289794
Time
Date	199411
Day	Sun
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : gso
State Reference	SC
Altitude	msl bound lower : 35000 msl bound upper : 35000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : ztl artcc : zau
Operator	common carrier : air carrier
Make Model Name	MD-88
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	cruise other other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : flight engineer
Experience	flight time last 90 days : 180 flight time total : 9000 flight time type : 2800
ASRS Report	289794
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 150 flight time total : 5000 flight time type : 150
ASRS Report	289991
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : declared emergency none taken : unable other
Consequence	other Other
Supplementary
Primary Problem	Aircraft

Narrative:

During engine start the right engine 'oil strainer clogging' message illuminated. The outside air temperature was 20 degrees F. The aircraft had overnighted on the ramp in bdl and was cold soaked. The pilot operating manual stated this was not abnormal in cold WX and that the light should go out when the oil had warmed sufficiently. Within 2 mins the light went out. In cruise 1 hour and 30 mins into the flight, in the vicinity of gso airport, the right engine 'oil strainer clogging' message illuminated. First indications were 2 loud grinding noises associated with vibrations. The first grinding sound and vibration continued for about 3 seconds followed by a second vibration and grinding sound of approximately 2 seconds. The 2 incidents were 2-3 mins apart. The only abnormal indication on the flight deck was the 'right oil strainer clogging' message. All engine indications appeared normal. The first officer and I followed the pilot operating manual procedure for 'oil strainer clogging' message in-flight. I instructed the first officer to notify flight control and let them know about our situation and that we would perform a precautionary engine shutdown and would need to divert to the nearest suitable airport. Gso was decided to be the nearest suitable airport. The first officer and I completed the abnormal procedure and the complete engine failure/shutdown/damage checklist. I declared an emergency with ATC and requested a divert to gso. A normal single engine approach and landing were made with no subsequent complications. I do not believe the 2 oil strainer lights were associated.

Original NASA ASRS Text

Title: OIL FILTER CLOGGING.

Narrative: DURING ENG START THE R ENG 'OIL STRAINER CLOGGING' MESSAGE ILLUMINATED. THE OUTSIDE AIR TEMP WAS 20 DEGS F. THE ACFT HAD OVERNIGHTED ON THE RAMP IN BDL AND WAS COLD SOAKED. THE PLT OPERATING MANUAL STATED THIS WAS NOT ABNORMAL IN COLD WX AND THAT THE LIGHT SHOULD GO OUT WHEN THE OIL HAD WARMED SUFFICIENTLY. WITHIN 2 MINS THE LIGHT WENT OUT. IN CRUISE 1 HR AND 30 MINS INTO THE FLT, IN THE VICINITY OF GSO ARPT, THE R ENG 'OIL STRAINER CLOGGING' MESSAGE ILLUMINATED. FIRST INDICATIONS WERE 2 LOUD GRINDING NOISES ASSOCIATED WITH VIBRATIONS. THE FIRST GRINDING SOUND AND VIBRATION CONTINUED FOR ABOUT 3 SECONDS FOLLOWED BY A SECOND VIBRATION AND GRINDING SOUND OF APPROX 2 SECONDS. THE 2 INCIDENTS WERE 2-3 MINS APART. THE ONLY ABNORMAL INDICATION ON THE FLIGHT DECK WAS THE 'R OIL STRAINER CLOGGING' MESSAGE. ALL ENG INDICATIONS APPEARED NORMAL. THE FO AND I FOLLOWED THE PLT OPERATING MANUAL PROC FOR 'OIL STRAINER CLOGGING' MESSAGE INFLT. I INSTRUCTED THE FO TO NOTIFY FLT CTL AND LET THEM KNOW ABOUT OUR SIT AND THAT WE WOULD PERFORM A PRECAUTIONARY ENG SHUTDOWN AND WOULD NEED TO DIVERT TO THE NEAREST SUITABLE ARPT. GSO WAS DECIDED TO BE THE NEAREST SUITABLE ARPT. THE FO AND I COMPLETED THE ABNORMAL PROC AND THE COMPLETE ENG FAILURE/SHUTDOWN/DAMAGE CHKLIST. I DECLARED AN EMER WITH ATC AND REQUESTED A DIVERT TO GSO. A NORMAL SINGLE ENG APCH AND LNDG WERE MADE WITH NO SUBSEQUENT COMPLICATIONS. I DO NOT BELIEVE THE 2 OIL STRAINER LIGHTS WERE ASSOCIATED.

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.