Casualties unknown

1990-11-26: Piper PA-28-161 (N2601X) — Trans Bay Airways — Livermore, CA

Livermore, CA, US

On November 26, 1990, a Piper PA-28-161 (registration N2601X) operated by Trans Bay Airways was involved in an aviation accident near Livermore, CA. Investigators recorded the probable cause as: The pilot's decision to continue flying under SVFR into deteriorating weather conditions, which resulted in a loss of visual reference and subsequent controlled flight into terrain. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive; 9 related events involving the same aircraft type or operator are linked below.

Sourcesthe U.S. National Transportation Safety Board (NTSB) historical archivePrimary reportUpdated 1781061362Data APIEditorial standards

A non-instrument rated pilot departed under special VFR into deteriorating weather, lost situational awareness, and crashed on rising terrain approximately eight miles from the airport.

What happened

The pilot, who was not instrument rated, departed an airport with an elevation of 397 feet under a Special Visual Flight Rules (SVFR) clearance. The intention was to return home. At the time of departure, the weather conditions at the airfield included a sky that was partially obscured with broken cloud layers estimated at 900 feet and overcast layers at 3,000 feet. Visibility was reported as four miles in rain.

During the initial climb out, visibility decreased rapidly to one mile. The pilot became uncertain of her position as the weather conditions deteriorated. While attempting to navigate through the poor visibility, she encountered rising terrain and initiated a climb to avoid it. Subsequently, the aircraft crashed into mountainous terrain located approximately eight miles south-southeast of the departure airport. The impact occurred at an elevation of approximately 2,800 feet.

Findings

The investigation highlighted several critical factors leading to the accident. The pilot was non-instrument rated, which limited her ability to operate safely in conditions where visual references were lost. The decision to depart under SVFR clearance into weather that quickly deteriorated below VFR minimums played a significant role. As visibility dropped to one mile, the pilot experienced a loss of situational awareness. The encounter with rising terrain while flying in clouds suggests controlled flight into terrain (CFIT) due to spatial disorientation or inability to maintain visual contact with the ground.

Safety message

Pilots operating under SVFR clearances must remain vigilant for rapidly changing weather conditions. Non-instrument rated pilots should exercise extreme caution when departing into marginal VFR weather, as the loss of visual references can lead to immediate spatial disorientation and terrain collision. Adhering strictly to instrument flight rules or delaying departure until conditions improve is essential for safety in mountainous regions.

Probable cause

The pilot's decision to continue flying under SVFR into deteriorating weather conditions, which resulted in a loss of visual reference and subsequent controlled flight into terrain.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001212X24643. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.