Casualties unknown

Aircraft Crashes into Mountain After Flight in Marginal Weather (N4367J)

Guatay, CA, US

On May 7, 1988, a Piper PA-28-140 (registration N4367J) operated by Hampshire, Robert J. was involved in an aviation accident near Guatay, CA. Investigators recorded the probable cause as: FAILURE OF THE PILOT TO MAINTIAN VFR WHILE FLYING IN MOUNTAINOUS TERRAIN. 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 pilot received a weather briefing indicating marginal VFR conditions and moderate turbulence, but did not obtain current local weather before departure. Three hours later, the aircraft was observed at low altitude in overcast mountainous terrain and struck a mountain peak.

Weather Briefing

The pilot received a weather briefing from a local Flight Service Station (FSS) the night before the planned flight. The FSS specialist informed the pilot of marginal VFR conditions and forecast moderate turbulence. The pilot stated he would check the weather in the morning.

The following day, the pilot contacted the FSS again for a weather update. The specialist reported that current local weather was not available and instead provided a 24-hour outlook. Turbulence remained in the forecast. The pilot did not attempt to check local weather conditions prior to the flight, which occurred approximately three hours later.

Accident Sequence

Witnesses observed the aircraft at an altitude of 200 feet above ground level (AGL), flying in and out of the ragged bottom of an overcast layer in mountainous terrain. The aircraft subsequently crashed in a level attitude, north of its intended course and heading approximately 90 degrees away from the course. The accident site was at the 4,700-foot level of a 5,054-foot mean sea level (MSL) mountain peak.

Investigation

The investigation documented the sequence of events, including the pilot's weather briefings and the circumstances of the crash. No causal factors were explicitly stated in the available information.

Frequently asked questions

What happened in the 7 May 1988 Piper PA-28-140 accident near Guatay, CA?

A pilot received a weather briefing indicating marginal VFR conditions and moderate turbulence, but did not obtain current local weather before departure. Three hours later, the aircraft was observed at low altitude in overcast mountainous terrain and struck a mountain peak.

What aircraft was involved and where did it happen?

The accident on 7 May 1988 involved a Piper PA-28-140, registration N4367J, operated by Hampshire, Robert J., at Guatay, CA.

What was the probable cause of the accident?

FAILURE OF THE PILOT TO MAINTIAN VFR WHILE FLYING IN MOUNTAINOUS TERRAIN.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001213X25712. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.