Casualties unknown

Aircraft Collides with Mountainside During Downdraft Encounter (N6242D)

Julian, CA, US

On April 9, 1994, a Cessna 172N (registration N6242D) operated by Darin Christenson was involved in an aviation accident near Julian, CA. Investigators recorded the probable cause as: IMPROPER PLANNING/DECISION BY THE PILOT(S). FACTORS RELATED TO THE ACCIDENT WERE: THE HIGH/MOUNTAINOUS TERRAIN AND ADVERSE WEATHER CONDITIONS. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive; 1 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

An instrument student and CFII encountered downdrafts in IFR conditions, losing altitude despite ATC assistance, and collided with a mountainside at 4,800 feet.

Background

On April 8, 1994, pilots were briefed about forecast frontal activity, gusty winds, and turbulence below 15,000 feet along the intended route. The following day, April 9, 1994, an instrument student and a certified flight instructor (CFII) conducted a flight.

Flight Sequence

During the flight on April 9, the aircraft entered instrument meteorological conditions at 8,000 feet. The instrument student reported being unable to maintain altitude due to downdrafts. The CFII then took control but also could not gain or maintain altitude. The instructor informed air traffic control (ATC) of the situation and was cleared to descend to 7,000 feet. Shortly after, he reported that the aircraft was descending through 6,300 feet in a downdraft. ATC issued a low altitude alert and requested that the flight maintain 7,000 feet. The CFII replied that he was attempting to do so and requested a radar vector. ATC warned that the aircraft was below minimum vectoring altitude and directed the crew to climb as soon as possible. Despite these efforts, the descent could not be stopped, and the aircraft collided with a mountainside at the 4,800-foot level.

Witness Account

Personnel in a nearby cabin reported that they were enveloped in a fast-moving cloud bank with high winds at the time of the accident.

Aftermath

No preimpact mechanical failure was found during the investigation. The aircraft sustained damage from the impact and subsequent ground fire.

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Frequently asked questions

What happened in the 9 Apr 1994 Cessna 172N accident near Julian, CA?

An instrument student and CFII encountered downdrafts in IFR conditions, losing altitude despite ATC assistance, and collided with a mountainside at 4,800 feet.

What aircraft was involved and where did it happen?

The accident on 9 Apr 1994 involved a Cessna 172N, registration N6242D, operated by Darin Christenson, at Julian, CA.

What was the probable cause of the accident?

IMPROPER PLANNING/DECISION BY THE PILOT(S). FACTORS RELATED TO THE ACCIDENT WERE: THE HIGH/MOUNTAINOUS TERRAIN AND ADVERSE WEATHER CONDITIONS.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001206X01116. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.