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Airplane Engine Induction Blocked by Cowl Plugs After Takeoff (N9602J)

Big Bear City, CA, US

On January 28, 1995, a Piper PA-28-180 (registration N9602J) was involved in an aviation accident near Big Bear City, CA. Investigators recorded the probable cause as: the pilot's improper preflight inspection during which he failed to insure removal of the induction air system inlet covers. This action resulted in a partial loss of engine power during initial climb. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive; 4 related events involving the same aircraft type or operator are linked below.

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

During takeoff, the airplane climbed to only 300 ft AGL, then turned right over rising terrain and collided with trees and a snow-covered mountainside. Investigation found foam rubber cowl plugs partially blocking the engine air induction system.

Overview

Witnesses reported observing nothing unusual during the airplane's takeoff, except that it climbed to only about 300 feet above ground level as it passed the departure end of runway 08. The airport's published departure procedure is to turn 10 degrees left of the runway heading and overfly level terrain.

Sequence of Events

Seconds after takeoff, the airplane was observed beginning a right crosswind turn over rising terrain. It subsequently collided with trees and a snow-covered mountainside about 0.76 miles southeast of the airport.

Examination Findings

Examination of the airplane revealed that the engine compartment air induction system was partially blocked by the presence of 2-inch-thick foam rubber cowl plugs. The plugs had been located in front of the No. 1 and 2 cylinders, and inside the carburetor air scoop inlet. The plugs exhibited a handmade appearance.

Engine failure

Related events

Same aircraft family

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Frequently asked questions

What happened in the 28 Jan 1995 Piper PA-28-180 accident near Big Bear City, CA?

During takeoff, the airplane climbed to only 300 ft AGL, then turned right over rising terrain and collided with trees and a snow-covered mountainside. Investigation found foam rubber cowl plugs partially blocking the engine air induction system.

What aircraft was involved and where did it happen?

The accident on 28 Jan 1995 involved a Piper PA-28-180, registration N9602J, at Big Bear City, CA.

What was the probable cause of the accident?

the pilot's improper preflight inspection during which he failed to insure removal of the induction air system inlet covers. This action resulted in a partial loss of engine power during initial climb. A factor which contributed to the accident was the pilot's decision to not follow published takeoff procedures which…

More accident analyses

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001207X02878. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.