Casualties unknown

Engine Failure Following Oil Leak from Finger-Tight Sensor Probe (N46373)

Palmdale, CA, US

On July 15, 1988, a Cessna 172K (registration N46373) was involved in an aviation accident near Palmdale, CA. Investigators recorded the probable cause as: Oil leak from a finger-tight oil heat sensor probe, resulting in engine failure. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive.

Sourcesthe U.S. National Transportation Safety Board (NTSB) historical archivePrimary reportUpdated 2026-07-04Data APIEditorial standards

A pilot experienced low oil pressure and subsequent engine failure while cruising. The aircraft landed short of the runway and nosed over in soft sand. Investigation revealed an oil leak from a finger-tight heat sensor probe.

Incident Overview

While cruising at 9,500 feet, the pilot observed that the oil pressure was low. Shortly thereafter, the engine ceased operation. The pilot maneuvered the aircraft toward an airport, but the airplane touched down short of the runway. During the landing roll, the aircraft nosed over in soft sand.

Post-Accident Inspection

Examination of the aircraft revealed that a considerable amount of oil had traveled aft on the lower engine cowling, originating from the nose gear area. The engine had undergone an annual inspection on the day of the accident and had accumulated less than one hour of flight time since that inspection.

Engine Examination

Further inspection of the engine determined that the oil heat sensor probe was only finger tight. Oil had leaked from that area, leading to the loss of oil pressure and subsequent engine failure.

Probable cause

Oil leak from a finger-tight oil heat sensor probe, resulting in engine failure.

Frequently asked questions

What happened in the 15 Jul 1988 Cessna 172K accident near Palmdale, CA?

A pilot experienced low oil pressure and subsequent engine failure while cruising. The aircraft landed short of the runway and nosed over in soft sand. Investigation revealed an oil leak from a finger-tight heat sensor probe.

What aircraft was involved and where did it happen?

The accident on 15 Jul 1988 involved a Cessna 172K, registration N46373, at Palmdale, CA.

What was the probable cause of the accident?

Oil leak from a finger-tight oil heat sensor probe, resulting in engine failure.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001213X26278. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.