Casualties unknown

Pilot Reports Ice Buildup, Crashes Short of Runway 32 at Bradford (N9511H)

Mount Alton, PA, US

On November 27, 1982, a Cessna 172H (registration N9511H) operated by William B. Plotts was involved in an aviation accident near Mount Alton, PA. 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 reported severe icing, engine roughness, and obscured windshield before the aircraft crashed about one mile short of runway 32. Ice buildup was found on the left horizontal stabilizer and under the right wing.

Incident Overview

While en route, the pilot reported that the aircraft was accumulating ice and would need to divert to Bradford. Approximately 12 miles from the airport, the pilot declared an emergency, stating that he did not believe he could execute a missed approach due to the ice buildup. The pilot then reported a rough engine and an airspeed of about 70 knots with full throttle applied.

Final Moments

Just prior to the crash, the pilot reported that ice had accumulated on the windshield to the extent that he could not see. The aircraft subsequently crashed approximately one mile short of runway 32.

Evidence of Ice Accumulation

Following the accident, an ice buildup was found coating the leading edge of the left horizontal stabilizer. The ice tapered in thickness from 1/4 inch at the root to about 1-1/2 inches at the tip. Additionally, pieces of ice measuring 3/4 to one inch thick were found in the ground scar beneath the right wing.

Weather Conditions

Icing conditions had been forecast along the route of flight.

Frequently asked questions

What happened in the 27 Nov 1982 Cessna 172H accident near Mount Alton, PA?

A pilot reported severe icing, engine roughness, and obscured windshield before the aircraft crashed about one mile short of runway 32. Ice buildup was found on the left horizontal stabilizer and under the right wing.

What aircraft was involved and where did it happen?

The accident on 27 Nov 1982 involved a Cessna 172H, registration N9511H, operated by William B. Plotts, at Mount Alton, PA.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20020917X05058. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.