PA34 pilot has oil leak on left engine while en route and diverts to hpn.

Attributes
ACN	592294
Time
Date	200308
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : hpn.airport
State Reference	NY
Altitude	msl single value : 35000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : n90.tracon tower : hpn.tower tracon : pct.tracon
Operator	common carrier : charter
Make Model Name	PA-34-200T Turbo Seneca II
Operating Under FAR Part	Part 135
Flight Phase	cruise : level descent : approach
Flight Plan	IFR
Person 1
Affiliation	company : charter
Function	flight crew : captain oversight : pic
Qualification	pilot : multi engine pilot : instrument pilot : commercial pilot : cfi
Experience	flight time last 90 days : 350 flight time total : 1650 flight time type : 330
ASRS Report	592294
Person 2
Affiliation	other
Function	observation : passenger
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	aircraft equipment other aircraft equipment : oil pressure indication 930 other flight crewa
Resolutory Action	controller : provided flight assist controller : issued new clearance flight crew : landed in emergency condition flight crew : landed as precaution flight crew : diverted to another airport
Consequence	other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

I had passenger flight from mvy to teb. My passenger and I departed mvy for teb. We leveled at our VFR altitude of 400-500 ft MSL with radar advisories. An hour later, we began a VFR descent to 2500 ft MSL to remain clear of new york's class B airspace. Upon approaching 3500 ft MSL, we received a class B clearance from new york approach. It was around this time that I noticed a significant amount of oil leaking down the cowling on the left engine. Concurrently, there was a slow, gradual decrease in the left oil pressure. I immediately advised new york approach of our situation and requested a straight-in approach to runway 29 at hpn. They notified the tower and advised us to change our frequency to hpn tower. We received a landing clearance from hpn tower and landed uneventfully. Upon touchdown, I shut down and secured the left engine. I taxied in with power from the right engine. Upon shutdown, the hpn emergency truck arrived. The driver advised me that new york approach or hpn tower had declared an emergency on my behalf.

Original NASA ASRS Text

Title: PA34 PLT HAS OIL LEAK ON L ENG WHILE ENRTE AND DIVERTS TO HPN.

Narrative: I HAD PAX FLT FROM MVY TO TEB. MY PAX AND I DEPARTED MVY FOR TEB. WE LEVELED AT OUR VFR ALT OF 400-500 FT MSL WITH RADAR ADVISORIES. AN HR LATER, WE BEGAN A VFR DSCNT TO 2500 FT MSL TO REMAIN CLR OF NEW YORK'S CLASS B AIRSPACE. UPON APCHING 3500 FT MSL, WE RECEIVED A CLASS B CLRNC FROM NEW YORK APCH. IT WAS AROUND THIS TIME THAT I NOTICED A SIGNIFICANT AMOUNT OF OIL LEAKING DOWN THE COWLING ON THE L ENG. CONCURRENTLY, THERE WAS A SLOW, GRADUAL DECREASE IN THE L OIL PRESSURE. I IMMEDIATELY ADVISED NEW YORK APCH OF OUR SIT AND REQUESTED A STRAIGHT-IN APCH TO RWY 29 AT HPN. THEY NOTIFIED THE TWR AND ADVISED US TO CHANGE OUR FREQ TO HPN TWR. WE RECEIVED A LNDG CLRNC FROM HPN TWR AND LANDED UNEVENTFULLY. UPON TOUCHDOWN, I SHUT DOWN AND SECURED THE L ENG. I TAXIED IN WITH PWR FROM THE R ENG. UPON SHUTDOWN, THE HPN EMER TRUCK ARRIVED. THE DRIVER ADVISED ME THAT NEW YORK APCH OR HPN TWR HAD DECLARED AN EMER ON MY BEHALF.

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.