1 engine of an light transport turbo propeller atx indicated lower than normal oil pressure which resulted in reducing the engine output and a diversion to an alternate.

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Attributes
ACN	272678
Time
Date	199406
Day	Wed
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : bdl
State Reference	CT
Altitude	msl bound lower : 24000 msl bound upper : 24000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zbw
Operator	common carrier : air taxi
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 135
Navigation In Use	Other Other
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	company : air taxi
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 100 flight time total : 3200 flight time type : 300
ASRS Report	272678
Person 2
Affiliation	company : air taxi
Function	flight crew : second officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	none taken : anomaly accepted other
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

Following level off at 240, right engine oil pressure was noted to be at 50 plus or minus 5 psi (normal is 55-65 psi). Checklist requires engine nh reduced to below 75 percent, which stabilized the pressure to 55 psi, aircraft diverted to bdl. Upon inspection, oil level appeared lower than 'add 3,' the amount required to add oil to sump. Oil was added, runup accomplished successfully. Note: first officer noted oil level at 'addz' at both iad and bos, verified by 2 company interns who accompanied the crew on the round trip. Also, 4 quarts had been added the day before, yet maintenance could find no evidence of an oil leak.

Original NASA ASRS Text

Title: 1 ENG OF AN LTT TURBO PROP ATX INDICATED LOWER THAN NORMAL OIL PRESSURE WHICH RESULTED IN REDUCING THE ENG OUTPUT AND A DIVERSION TO AN ALTERNATE.

Narrative: FOLLOWING LEVEL OFF AT 240, R ENG OIL PRESSURE WAS NOTED TO BE AT 50 PLUS OR MINUS 5 PSI (NORMAL IS 55-65 PSI). CHKLIST REQUIRES ENG NH REDUCED TO BELOW 75 PERCENT, WHICH STABILIZED THE PRESSURE TO 55 PSI, ACFT DIVERTED TO BDL. UPON INSPECTION, OIL LEVEL APPEARED LOWER THAN 'ADD 3,' THE AMOUNT REQUIRED TO ADD OIL TO SUMP. OIL WAS ADDED, RUNUP ACCOMPLISHED SUCCESSFULLY. NOTE: FO NOTED OIL LEVEL AT 'ADDZ' AT BOTH IAD AND BOS, VERIFIED BY 2 COMPANY INTERNS WHO ACCOMPANIED THE CREW ON THE ROUND TRIP. ALSO, 4 QUARTS HAD BEEN ADDED THE DAY BEFORE, YET MAINT COULD FIND NO EVIDENCE OF AN OIL LEAK.

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.