Casualties unknown

Aircraft Strikes Powerlines After Engine Noise Change During Low-Altitude Maneuver (N620U)

Yuma, CO, US

On September 16, 1983, a Grumman G-164A (registration N620U) was involved in an aviation accident near Yuma, CO. 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

An aircraft was observed turning at low altitude after lift-off, then entered a nose-high climb with increased engine noise. It struck powerlines and fell. Pilot reported 29 inches MP and 2000 RPM; operator stated required settings for loaded flight are 31 inches MP and 2100 RPM.

Incident Overview

An aircraft was observed making a turn shortly after lift-off at a very low altitude. It then maneuvered to a climb attitude. As the aircraft pitched nose-up, the engine noise was heard to become louder. The aircraft subsequently settled in a nose-high attitude, struck powerlines, and fell to the ground.

Pilot and Operator Statements

The pilot stated that the power setting during the flight was 29 inches of manifold pressure (MP) and 2000 RPM. The operator stated that, when carrying a load, the aircraft must be flown with 31 inches MP and 2100 RPM.

Sequence of Events

  • The aircraft lifted off and turned at low altitude.
  • It transitioned to a climb attitude, during which engine noise increased.
  • The aircraft settled into a nose-high attitude.
  • It then struck powerlines and descended to the ground.

No further details were provided regarding the aircraft type, registration, number of occupants, injuries, or damage.

Frequently asked questions

What happened in the 16 Sept 1983 Grumman G-164A accident near Yuma, CO?

An aircraft was observed turning at low altitude after lift-off, then entered a nose-high climb with increased engine noise. It struck powerlines and fell. Pilot reported 29 inches MP and 2000 RPM; operator stated required settings for loaded flight are 31 inches MP and 2100 RPM.

What aircraft was involved and where did it happen?

The accident on 16 Sept 1983 involved a Grumman G-164A, registration N620U, at Yuma, CO.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001214X44513. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.