Lake LA-4-200 N39451

Summary

On 28 December 1983 at about 05:10 local time, a Lake LA-4-200 registered N39451 was involved in an accident near Great Falls, Montana, United States. One person was on board and nobody was injured. The aircraft was substantially damaged. No probable cause statement is available for this record.

Date

28 December 1983 at 05:10

Classification

Accident

Location

Great Falls, Montana, United States

Nearest airport

Great Falls (GTF)

Coordinates

47.5097, -111.2707

Aircraft

Lake LA-4-200

Registration

N39451

Category

Airplane

Engines

1

Operator

Not recorded

Operating rule

Part 91: General Aviation

Purpose of flight

Personal

Phase of flight

Not recorded

Route

Missoula → Miles City

Aircraft damage

Substantial

Weather

VMC

Light

Night/Dark

NTSB number

DEN84LA052

Nobody was injured.

The NTSB has not published a probable cause for this record. No probable cause statement is present in the source data.

Nothing about the cause is stated here that is not in the source record.

Read the full NTSB narrative

THE ACFT WAS DAMAGED IN A FORCED LANDING ON A HIGHWAY AFTER THE ENGINE SEIZED. THE PLT SAID 'THE ENGINE MADE UNUSUAL SOUNDS OF AN ENGINE RUNNING BAD.' THEN IT LOST COMPRESSION AND SEIZED. HE MADE A FORCED LANDING ON A HIGHWAY AND DAMAGEDTHE HULL. EXAMINATION OF THE ACFT REVEALED A SITUATION WHERE THE MAIN OIL BREATHER FROZE PREVENTING OIL VAPOR PRESSURE FROM VENTING; CAUSING THE ENGINE SEALS TO FAIL AND THEREBY DEPLETNG THE OIL SUPPLY.

Quoted verbatim from the NTSB record.