Flight Crew Air Transport Pilot (ATP); Flight Crew Multiengine
Flight Crew Last 90 Days 42; Flight Crew Total 5800; Flight Crew Type 322
Training / Qualification; Time Pressure; Workload; Situational Awareness
Aircraft Equipment Problem Critical
Flight Crew Returned To Departure Airport; Flight Crew Landed in Emergency Condition; Flight Crew Inflight Shutdown; Flight Crew FLC complied w / Automation / Advisory; General Maintenance Action; General Declared Emergency
Aircraft
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.
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.