Aircraft unable to climb during takeoff at high density altitude

Casualties unknown • Mammoth Lakes, CA, US

A pilot experienced a failed climb following takeoff from a high-elevation airport, resulting in a controlled descent into terrain.

What happened

Prior to departure, the pilot loaded the aircraft with full fuel. The airport elevation was 7,128 feet MSL, and the Automated Weather Observing System (AWOS) reported a density altitude of 9,400 feet. At the time of the event, the METAR indicated a temperature of 73 degrees Fahrenheit and an altimeter setting of 30.22 inHg.

The pilot reviewed procedures for a high-altitude takeoff, performed an engine run-up, and leaned the mixture for departure. After taxiing into position, the pilot applied the brakes and then applied power. Because the runway was slightly uphill, the pilot noted that the airplane did not appear to be developing full power; however, the takeoff was not aborted.

The aircraft reached a climb of approximately 200 feet but was unable to gain further altitude. To avoid a stall that might be induced by an attempted turn, the pilot lowered the landing gear and reduced airspeed as much as possible. The pilot maintained a controlled descent into the terrain, estimating the touchdown speed to be between 50 and 60 knots.

Probable cause

The high density altitude prevented the aircraft from achieving sufficient climb performance.

Frequently asked questions

What happened in the 1999-07-17 Piper PA32R-300 accident near Mammoth Lakes, CA?

A pilot experienced a failed climb following takeoff from a high-elevation airport, resulting in a controlled descent into terrain.

What aircraft was involved and where did it happen?

The accident on 1999-07-17 involved a Piper PA32R-300, registration N1692H, at Mammoth Lakes, CA.

What was the probable cause of the accident?

The high density altitude prevented the aircraft from achieving sufficient climb performance.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001212X19303. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.

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