Casualties unknown

Pilot Reports Downdraft Encounter Near Gerlach, Nevada (N9977Q)

Gerlach, NV, US

On July 21, 1991, a Piper PA 18-135 (registration N9977Q) operated by Gregory Powning was involved in an aviation accident near Gerlach, NV. Investigators recorded the probable cause as: THE FAILURE OF THE PILOT TO MAINTAIN ADEQUATE TERRAIN CLEARANCE BY THE SELECTION OF AN INAPPROPRIATE CRUISE ALTITUDE RESULTING IN AN IN FLIGHT COLLISION WITH 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 2026-06-10Data APIEditorial standards

A pilot reported encountering a downdraft while flying near Gerlach, Nevada, resulting in a collision with terrain. No mechanical malfunction was noted, and nearby winds were calm.

Incident Overview

A pilot flying near Gerlach, Nevada, reported encountering a downdraft while crossing a small ridge at low altitude. According to the pilot's written and verbal statements, the downdraft occurred just as the aircraft overflew the ridge, and the pilot was unable to arrest the rate of descent before the aircraft collided with the ground in the valley beyond.

Pilot Statements

In both his written and verbal accounts, the pilot stated that there was no mechanical malfunction of the aircraft. He attributed the accident solely to the downdraft. The pilot did not indicate that high winds or other unusual meteorological conditions were involved in the circumstances of the accident.

Weather Conditions

The closest weather reporting station reported winds of less than five knots at the time of the accident. The pilot did not report any specific weather anomalies beyond the localized downdraft.

Investigation Status

No further details have been released regarding the aircraft type, registration, operator, or the number of occupants. The accident investigation is ongoing, and no probable cause has been determined at this time.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001212X17610. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.