Casualties unknown

Midair Collision Between Bell 206L and Cessna 172 over Holliston, Massachusetts (N302MC)

Holliston, MA, US

On April 14, 1986, a Bell 206L-3 (registration N302MC) operated by Millipore Corpopation was involved in an aviation accident near Holliston, MA. 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
Aircraft registered N302MC
Aircraft registered N302MC. Photo: Alec Wilson from Hampton-in-Arden, UK / CC BY-SA 2.0, via Wikimedia Commons

A Bell 206L helicopter and a Cessna 172 collided at 2,000 feet over Holliston, MA. Both were operating VFR with no flight plan or ATC communication. The Cessna pilot did not see the helicopter. The helicopter crashed, and the Cessna force-landed in a field.

Incident Overview

A Bell 206L helicopter and a Cessna 172 airplane collided in midair at an altitude of 2,000 feet over Holliston, Massachusetts. Both aircraft were operating under visual flight rules (VFR) and had not filed a flight plan nor established communications with air traffic control.

Witness Accounts

According to witnesses, the Bell 206L was traveling in a north-northeasterly direction, while the Cessna 172 was on a northeasterly heading. The pilot of the Cessna stated that he was in the process of initiating a right turn when the collision occurred. He reported that he never saw the helicopter nor any other traffic prior to impact.

Flight Details

The Cessna had departed from Hopedale Airport approximately five minutes before the accident. No further details about the helicopter's origin or intended route were provided in the source.

Collision and Aftermath

An inspection of the Cessna revealed rotor blade slash marks in its lower left engine cowling. Following the collision, the helicopter descended uncontrollably and impacted terrain. The Cessna was force-landed in a field.

Frequently asked questions

What happened in the 14 Apr 1986 Bell 206L-3 accident near Holliston, MA?

A Bell 206L helicopter and a Cessna 172 collided at 2,000 feet over Holliston, MA. Both were operating VFR with no flight plan or ATC communication. The Cessna pilot did not see the helicopter. The helicopter crashed, and the Cessna force-landed in a field.

What aircraft was involved and where did it happen?

The accident on 14 Apr 1986 involved a Bell 206L-3, registration N302MC, operated by Millipore Corpopation, at Holliston, MA.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001213X33224. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.