Casualties unknown

Pilot Reports Stall Warning Before Cliff Collision Near Mountain Airport (N733CN)

Avalon, CA, US

On April 4, 1997, a Cessna 172N (registration N733CN) operated by Concord Flight International was involved in an aviation accident near Avalon, CA. Investigators recorded the probable cause as: The pilot's misjudging the airplane's altitude and distance to the runway and an excessive descent rate, which led to an undershoot, and the pilot's failure to maintain an adequate airspeed during the approach. 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

A pilot flying a traffic pattern extended full flaps on final, then applied full power without retracting them. The stall warning horn activated, a right bank followed, and the airplane struck a cliff 150 yards from the runway.

Accident Summary

A pilot-in-command, seated in the left seat, was flying the airplane while a right-seated passenger—also a pilot—assisted with navigation. The pilot entered a right-hand traffic pattern. Believing the airplane appeared slightly high when turning onto the final approach leg, the pilot extended full flaps. The airplane then descended below the elevation of the mountain top airport. In response, the pilot applied full engine power but did not retract the wing flaps. Seconds later, the stall warning horn activated. The pilot banked the airplane to the right, and the airplane collided with the side of a cliff, within 150 yards of the approaching end of the runway.

Witness Observations

A witness, who was waiting to take off, observed the approaching airplane. The witness reported that when the airplane was about one-eighth mile from the runway, it was flying in a nose-high attitude, its speed was slow, its flaps appeared fully extended, and it was very low.

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Frequently asked questions

What happened in the 4 Apr 1997 Cessna 172N accident near Avalon, CA?

A pilot flying a traffic pattern extended full flaps on final, then applied full power without retracting them. The stall warning horn activated, a right bank followed, and the airplane struck a cliff 150 yards from the runway.

What aircraft was involved and where did it happen?

The accident on 4 Apr 1997 involved a Cessna 172N, registration N733CN, operated by Concord Flight International, at Avalon, CA.

What was the probable cause of the accident?

The pilot's misjudging the airplane's altitude and distance to the runway and an excessive descent rate, which led to an undershoot, and the pilot's failure to maintain an adequate airspeed during the approach. Contributing factors were the pilot's delay in initiating corrective action.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001208X07743. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.