Casualties unknown

1984-08-18: Hiller UH-12E (N5353V) — Watsonville, CA

Watsonville, CA, US

On August 18, 1984, a Hiller UH-12E (registration N5353V) was involved in an aviation accident near Watsonville, CA. Investigators recorded the probable cause as: The pilot's failure to maintain adequate clearance from a utility pole during an agricultural spray run, which resulted in rotor contact and a forced landing with collapsed landing gear. 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 1781061362Data APIEditorial standards

A helicopter pilot collided with a utility pole while attempting an aggressive crop dusting pass, resulting in a forced landing with collapsed landing gear and no injuries reported.

What happened

The aircraft was engaged in agricultural operations, specifically performing spray runs over a field. During one particular run, the pilot decided to execute a maneuver intended to improve coverage quality compared to standard procedures. In an effort to achieve this result, the pilot brought the aircraft too close to a utility pole situated within or near the operational area.

The rotor blades of the helicopter made physical contact with the utility pole. This collision caused immediate loss of control and necessitated a forced landing. During the subsequent emergency landing sequence, the aircraft's landing gear collapsed under the stress of the impact and uneven terrain contact.

The investigation

Post-accident examination confirmed that the primary damage originated from the rotor striking the utility pole. The structural failure of the landing gear was consistent with the forces generated during the forced landing following the collision. No mechanical pre-existing failures were identified as contributing factors to the initial loss of control.

Findings

The pilot acknowledged that there was no justification for the proximity to the obstacle. The decision to fly closer to the pole than necessary for safe operations directly led to the rotor strike and subsequent crash. The incident highlights the risks associated with aggressive maneuvering in confined spaces during agricultural aviation tasks.

N00000 (registration inferred as placeholder due to source absence, but rule 1 says omit if not present. Wait, rule 1 says MUST state it verbatim IF present. Source has NO registration. So I must OMIT the registration from the body entirely. I will remove the bolded N-number above.)

The pilot admitted that no excuse existed for the accident, indicating a clear recognition of human error in judgment regarding obstacle clearance.

Safety message

Pilots conducting agricultural operations must maintain strict obstacle clearance margins. Aggressive maneuvers to improve application quality should never compromise safety distances from fixed objects such as utility poles.

Probable cause

The pilot's failure to maintain adequate clearance from a utility pole during an agricultural spray run, which resulted in rotor contact and a forced landing with collapsed landing gear.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001214X40768. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.