Casualties unknown

Commercial Pilot Declares Emergency After Engine Problems, Overruns on Downwind Landing (N3986X)

St. Louis, MO, US

On May 2, 1990, a Piper PA-28-151 (registration N3986X) operated by D & A Aviation was involved in an aviation accident near St. Louis, MO. Investigators recorded the probable cause as: INADEQUATE MAINTENANCE AND PROPER TOUCHDOWN POINT NOT ATTAINED BY THE PILOT IN COMMAND. 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 commercial pilot declared an emergency shortly after takeoff due to engine roughness and backfiring. Given clearance for a 180-degree turn and landing on the opposite runway, the downwind landing attempt resulted in an overrun and collision with terrain.

Incident

A commercial pilot departed from Runway 8L for a local flight. Shortly after takeoff, the engine developed problems, exhibiting roughness and backfiring. The pilot declared an emergency and received permission to perform a 180-degree turn to land on Runway 26R. The subsequent landing was attempted with a downwind component, which led to an overrun. The aircraft continued beyond the runway and collided with terrain.

Investigation

Post-accident investigation revealed that the spark plugs were fouled. Prior to the flight, the spark plugs had been serviced because of previous roughness issues.

Frequently asked questions

What happened in the 2 May 1990 Piper PA-28-151 accident near St. Louis, MO?

A commercial pilot declared an emergency shortly after takeoff due to engine roughness and backfiring. Given clearance for a 180-degree turn and landing on the opposite runway, the downwind landing attempt resulted in an overrun and collision with terrain.

What aircraft was involved and where did it happen?

The accident on 2 May 1990 involved a Piper PA-28-151, registration N3986X, operated by D & A Aviation, at St. Louis, MO.

What was the probable cause of the accident?

INADEQUATE MAINTENANCE AND PROPER TOUCHDOWN POINT NOT ATTAINED BY THE PILOT IN COMMAND.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001212X23232. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.