A LR35 crew declared an emergency and the flight returned to the departure airport after the master ...

Attributes
ACN	1042174
Time
Date	201210
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Learjet 35
Operating Under FAR Part	Part 91
Flight Phase	Climb
Route In Use	Direct
Flight Plan	IFR
Component
Aircraft Component	Engine Oil Seals
Person 1
Function	Captain Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Multiengine
Experience	Flight Crew Last 90 Days 42 Flight Crew Total 5800 Flight Crew Type 322
Events
Anomaly	Aircraft Equipment Problem Critical

Narrative:

Climbing out of FL270; master warning lights illuminated; subsequent engine instruments verified actual loss of left engine oil pressure with normal oil temperature indications. Per the flight manual; a precautionary engine shutdown was performed and secured per the emergency procedure. ATC was notified of our intention to declare an emergency and return to the departure airport. We; as a crew; decided in order to expedite our return as soon as possible; we would elect to perform an overweight landing instead of dumping fuel over a populated area. An abnormal landing was briefed and conducted without incident. Upon inspection; the engine oil dipstick was found to have a faulty 'O' ring. The aircraft was written up for both the precautionary engine shutdown and the overweight landing.

Original NASA ASRS Text

Title: A LR35 crew declared an emergency and the flight returned to the departure airport after the Master Warning and Oil Pressure Lights alerted the loss of oil quantity because a faulty oil dip stick seal.

Narrative: Climbing out of FL270; Master Warning lights illuminated; subsequent engine instruments verified actual loss of left engine oil pressure with normal oil temperature indications. Per the Flight Manual; a precautionary engine shutdown was performed and secured per the emergency procedure. ATC was notified of our intention to declare an emergency and return to the departure airport. We; as a crew; decided in order to expedite our return as soon as possible; we would elect to perform an overweight landing instead of dumping fuel over a populated area. An abnormal landing was briefed and conducted without incident. Upon inspection; the engine oil dipstick was found to have a faulty 'O' ring. The aircraft was written up for both the precautionary engine shutdown and the overweight landing.

Data retrieved from NASA's ASRS site as of July 2013 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.

A LR35 crew declared an emergency and the flight returned to the departure airport after the master warning and oil pressure lights alerted the loss of oil quantity because a faulty oil dip stick seal.