Casualties unknown

Piper PA-34-200T Collides with Trees in Hilly Terrain After Takeoff in Fog (N6522F)

San Andreas, CA, US

On December 11, 1991, a Piper PA34-200T (registration N6522F) operated by Ponte, Dennis S. was involved in an aviation accident near San Andreas, CA. Investigators recorded the probable cause as: THE FAILURE OF THE NONMULTIENGINE/INSTRUMENT RATED PILOT IN COMMAND TO ACCOMPLISH THE PROPER EMERGENCY PROCEDURE DURING A LOSS OF ENGINE POWER. 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 twin-engine Piper PA-34-200T struck trees in hilly terrain eight miles southwest of the airport after departing in fog. The pilot reported left engine power loss but did not execute emergency procedures. The engine showed no mechanical failure. The pilot lacked valid medical, multi-engine, and instrument ratings, and had prior certificate suspensions.

Accident Details

A Piper PA-34-200T twin-engine aircraft collided with trees in hilly terrain located approximately eight miles southwest of the departure airport. The accident occurred following takeoff in foggy conditions. The pilot, a private pilot certificate holder who was not rated for multi-engine or instrument operations, reported experiencing a loss of power in the left engine. According to the investigation, the pilot did not follow the emergency procedures required for loss of engine power.

Engine Examination

An examination of the accident aircraft's engines revealed no mechanical failures or malfunctions. The investigation found that the engine in question had no pre-existing issues that would have caused the reported power loss.

Pilot Information

The pilot's medical certificate had expired. The most recent third-class medical certificate was issued on May 4, 1983, and had since lapsed. Additionally, the pilot did not hold an airplane multi-engine class rating or an instrument airplane rating, and could not provide proof of a current biennial flight review. A review of the pilot's airmen records, maintained by the Federal Aviation Administration in Oklahoma City, Oklahoma, disclosed three prior suspensions of the pilot's private pilot certificate for violations of federal aviation regulations.

Frequently asked questions

What happened in the 11 Dec 1991 Piper PA34-200T accident near San Andreas, CA?

A twin-engine Piper PA-34-200T struck trees in hilly terrain eight miles southwest of the airport after departing in fog. The pilot reported left engine power loss but did not execute emergency procedures. The engine showed no mechanical failure. The pilot lacked valid medical, multi-engine, and instrument ratings,…

What aircraft was involved and where did it happen?

The accident on 11 Dec 1991 involved a Piper PA34-200T, registration N6522F, operated by Ponte, Dennis S., at San Andreas, CA.

What was the probable cause of the accident?

THE FAILURE OF THE NONMULTIENGINE/INSTRUMENT RATED PILOT IN COMMAND TO ACCOMPLISH THE PROPER EMERGENCY PROCEDURE DURING A LOSS OF ENGINE POWER. CONTRIBUTING TO THE ACCIDENT WAS THE PILOT'S IMPROPER TRAINING, LACK OF INSTRUMENT EXPERIENCE, HEAVY FOG REPORTED IN THE ACCIDENT AREA AT THE TIME OF THE ACCIDENT AND THE…

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001212X18620. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.