Beech kingair 90 pilot has a precautionary engine shutdown due to loss of engine oil.

Attributes
ACN	691880
Time
Date	200603
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : zzz.airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zzz.artcc
Operator	common carrier : charter
Make Model Name	King Air C90 E90
Operating Under FAR Part	Part 135
Flight Phase	cruise : level
Flight Plan	IFR
Person 1
Affiliation	company : charter
Function	flight crew : single pilot oversight : pic
Qualification	pilot : multi engine pilot : private pilot : instrument pilot : commercial
Experience	flight time last 90 days : 14 flight time total : 1627 flight time type : 337
ASRS Report	691880
Events
Anomaly	aircraft equipment problem : critical maintenance problem : improper maintenance
Independent Detector	aircraft equipment other aircraft equipment : oil pressure gauge other flight crewa
Resolutory Action	flight crew : diverted to another airport flight crew : landed as precaution
Consequence	other
Supplementary
Problem Areas	Flight Crew Human Performance Maintenance Human Performance
Primary Problem	Flight Crew Human Performance

Narrative:

While en route; I noticed a fluctuation in torque on the right engine. I pulled the circuit breaker and reset it. Upon resetting the breaker; the torque continued to fluctuate. I scanned the other engine instruments to find low oil pressure in the right engine. I looked out to the right engine and noticed oil on the cowl and wing. I proceeded with the emergency engine shutdown procedure. I informed the passenger of the situation and then I proceeded to declare an emergency and change my destination. I shut the right engine down and the approach and landing were uneventful. I taxied to the ramp on the remaining engine. After deplaning and upon further examination of the engine. I noticed oil covering the surface of the cowling; wheel well; and engine. A possible cause of the oil leak was the improper placement of the oil dipstick. The dipstick was not sealed properly. A lineman had put a quart of oil in the right engine; secured the cowl and departed. On my way to examine the dipstick and cowl; my passenger arrived; not giving me the opportunity to rechk the lineman's work.

Original NASA ASRS Text

Title: BEECH KINGAIR 90 PLT HAS A PRECAUTIONARY ENG SHUTDOWN DUE TO LOSS OF ENG OIL.

Narrative: WHILE ENRTE; I NOTICED A FLUCTUATION IN TORQUE ON THE R ENG. I PULLED THE CIRCUIT BREAKER AND RESET IT. UPON RESETTING THE BREAKER; THE TORQUE CONTINUED TO FLUCTUATE. I SCANNED THE OTHER ENG INSTS TO FIND LOW OIL PRESSURE IN THE R ENG. I LOOKED OUT TO THE R ENG AND NOTICED OIL ON THE COWL AND WING. I PROCEEDED WITH THE EMER ENG SHUTDOWN PROC. I INFORMED THE PAX OF THE SITUATION AND THEN I PROCEEDED TO DECLARE AN EMER AND CHANGE MY DEST. I SHUT THE R ENG DOWN AND THE APCH AND LNDG WERE UNEVENTFUL. I TAXIED TO THE RAMP ON THE REMAINING ENG. AFTER DEPLANING AND UPON FURTHER EXAMINATION OF THE ENG. I NOTICED OIL COVERING THE SURFACE OF THE COWLING; WHEEL WELL; AND ENG. A POSSIBLE CAUSE OF THE OIL LEAK WAS THE IMPROPER PLACEMENT OF THE OIL DIPSTICK. THE DIPSTICK WAS NOT SEALED PROPERLY. A LINEMAN HAD PUT A QUART OF OIL IN THE R ENG; SECURED THE COWL AND DEPARTED. ON MY WAY TO EXAMINE THE DIPSTICK AND COWL; MY PAX ARRIVED; NOT GIVING ME THE OPPORTUNITY TO RECHK THE LINEMAN'S WORK.

Data retrieved from NASA's ASRS site as of January 2009 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.