Casualties unknown

Aircraft Collides with Rising Terrain During Cross-Country Flight in Instrument Meteorological Conditions (N9945U)

Livermore, CA, US

On July 1, 1983, a Grumman American AA-5A (registration N9945U) was involved in an aviation accident near Livermore, CA. 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 on a 72-mile cross-country flight collided with rising terrain at 1,200 ft MSL while flying in a canyon under low overcast conditions, within 5 miles of its destination. No flight plan was filed and no weather briefing was obtained.

Accident Overview

An aircraft collided with rising terrain during a cross-country flight conducted in instrument meteorological conditions (IMC). The accident occurred while the pilot was navigating through a canyon under low overcast weather. The aircraft struck terrain at an elevation of 1,200 feet MSL. The accident site was within 5 miles of the intended destination.

Flight Information

The flight was a routine 72-mile cross-country trip that the pilot flew approximately three times per week. No flight plan was filed for the flight, and the pilot did not obtain a weather briefing before departure.

Terrain and Weather Conditions

The surrounding area includes mountain peaks reaching up to 2,500 feet MSL. The pilot was flying up a canyon when the aircraft encountered low overcast conditions and subsequently collided with rising terrain.

Frequently asked questions

What happened in the 1 Jul 1983 Grumman American AA-5A accident near Livermore, CA?

An aircraft on a 72-mile cross-country flight collided with rising terrain at 1,200 ft MSL while flying in a canyon under low overcast conditions, within 5 miles of its destination. No flight plan was filed and no weather briefing was obtained.

What aircraft was involved and where did it happen?

The accident on 1 Jul 1983 involved a Grumman American AA-5A, registration N9945U, at Livermore, CA.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001214X43772. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.