Casualties unknown

Pilot misjudges clearance under powerlines during agricultural spray flight (N4859S)

Stockton, CA, US

On July 1, 1982, a Grumman G-164B (registration N4859S) operated by Bud Murphy was involved in an aviation accident near Stockton, CA. Investigators recorded the probable cause as: The pilot's misjudgment of altitude clearance, which resulted in striking a second set of high-power lines during an agricultural spraying operation. 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 2026-06-23Data APIEditorial standards

A pilot conducting agricultural spraying operations struck a second set of high-voltage powerlines after pulling up too soon while navigating between two parallel wire spans.

What happened

The aircraft was engaged in an agricultural application mission, specifically spraying a field that necessitated flight beneath two distinct sets of high-power lines. During the operation, the pilot completed one pass under the first set of wires without incident. On the subsequent third pass, while approaching the second set of powerlines, the pilot initiated a climb too early in the sequence. This premature ascent resulted in the aircraft striking the second set of wires.

The investigation

Post-accident review focused on the flight path and the pilot's account of the event. The physical evidence confirmed contact with the second span of high-voltage infrastructure. No mechanical failure or system malfunction was identified as a contributing factor to the collision.

Findings

The primary factor in this accident was the pilot's spatial misjudgment regarding altitude clearance. The pilot acknowledged in the official accident report that the error stemmed from a split-second lapse in judgment concerning the timing of the climb maneuver relative to the powerline obstacle. This indicates a failure to maintain adequate vertical separation while navigating complex terrain obstacles during low-level agricultural operations.

Probable cause

The pilot's misjudgment of altitude clearance, which resulted in striking a second set of high-power lines during an agricultural spraying operation.

Frequently asked questions

What happened in the 1 Jul 1982 Grumman G-164B accident near Stockton, CA?

A pilot conducting agricultural spraying operations struck a second set of high-voltage powerlines after pulling up too soon while navigating between two parallel wire spans.

What aircraft was involved and where did it happen?

The accident on 1 Jul 1982 involved a Grumman G-164B, registration N4859S, operated by Bud Murphy, at Stockton, CA.

What was the probable cause of the accident?

The pilot's misjudgment of altitude clearance, which resulted in striking a second set of high-power lines during an agricultural spraying operation.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20020917X03714. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.