4 fatalities

Aircraft Accident at Conchas Lake: Family Flight Ends in Desert Impact (N5429U)

Conchas, NM, US

On August 21, 1983, a Beech V35 (registration N5429U) operated by Gelder Aviation Inc. was involved in an aviation accident near Conchas, NM. 4 people were killed. 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

An aircraft carrying four family members crashed in the desert after departing from an airport near Conchas Lake. The pilot had been giving rides and was observed buzzing boats. Investigation reveals control wheel was positioned for non-pilot passenger; pilot had elevated alcohol level.

Accident Overview

An aircraft accident occurred near Conchas Lake after a flight departed with four adults aboard—three brothers and one sister. The pilot had been giving rides to various family members, and the aircraft was observed flying in the area on several occasions. Reports indicated that the aircraft had 'buzzed' boats on the lake multiple times during the day.

Flight and Impact

The accident flight departed from runway 9 and traveled approximately three-quarters of a mile before impacting the desert terrain in a steep nose-down attitude.

Control System Examination

Examination of the throwover control wheel and its pivoting arm, which had separated, indicated that it was most probably positioned for use by the right-seat passenger, who was not a certificated pilot.

Pilot Toxicology

The pilot's muscle tissue alcohol level was 0.113.

Frequently asked questions

What happened in the 21 Aug 1983 Beech V35 accident near Conchas, NM?

An aircraft carrying four family members crashed in the desert after departing from an airport near Conchas Lake. The pilot had been giving rides and was observed buzzing boats. Investigation reveals control wheel was positioned for non-pilot passenger; pilot had elevated alcohol level.

Were there any fatalities in the 21 Aug 1983 Beech V35 accident?

The accident was fatal, resulting in 4 fatalities.

What aircraft was involved and where did it happen?

The accident on 21 Aug 1983 involved a Beech V35, registration N5429U, operated by Gelder Aviation Inc., at Conchas, NM.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001214X44141. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.