Casualties unknown

Pilot Encounters Terrain Rise Exceeding Aircraft Climb Performance During Initial Climb (N5809U)

Agua Dulce, CA, US

On October 13, 1990, a Piper PA-28-140 (registration N5809U) operated by R.i. Flying Club was involved in an aviation accident near Agua Dulce, CA. Investigators recorded the probable cause as: A FAILURE OF THE PILOT TO PERFORM PREFLIGHT PLANNING. 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

During initial climb, the pilot noted low altitude and a climb rate insufficient to outpace rising terrain, with calculations showing the aircraft loaded forward of its center of gravity limit and terrain rising faster than the maximum climb rate.

Incident Overview

During initial climb towards rising terrain, the pilot observed that the aircraft was not very high but perceived no immediate danger. He stated that he planned to navigate through a lower pass in the hills but noticed his rate of climb was very low and could not be improved. He remarked that the terrain was rising faster than he was.

Weight and Balance Calculations

According to calculations provided by the Piper Aircraft Company, the aircraft was loaded 3/4 of an inch forward of the maximum forward center of gravity limit. These calculations further established that the terrain rose at a rate of 450 feet per mile, while the maximum climb rate of the aircraft was 375 feet per mile.

Pilot Observations

The pilot's account indicates he was aware of the low altitude and the inability to increase climb performance. His planned navigation through a lower pass suggests an attempt to mitigate the terrain rise, but the insufficient climb rate prevented successful avoidance.

Frequently asked questions

What happened in the 13 Oct 1990 Piper PA-28-140 accident near Agua Dulce, CA?

During initial climb, the pilot noted low altitude and a climb rate insufficient to outpace rising terrain, with calculations showing the aircraft loaded forward of its center of gravity limit and terrain rising faster than the maximum climb rate.

What aircraft was involved and where did it happen?

The accident on 13 Oct 1990 involved a Piper PA-28-140, registration N5809U, operated by R.i. Flying Club, at Agua Dulce, CA.

What was the probable cause of the accident?

A FAILURE OF THE PILOT TO PERFORM PREFLIGHT PLANNING.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001212X24488. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.