Density Altitude Knot Threshold 
Flying Magazine
JUNE 10, 2025
minutes, covered 1,722 nm at an average ground speed of 511 knots, and burned 22,200 pounds of jet-A. Below 500 feet I got a bit slow, momentarily down to 147 knots, versus a reference speed of 144 and target of 152. On a typical flight I taxi at a maximum of 21 knots, rotate at 1.9 I hand-flew the first 13.3
Plane and Pilot
JULY 1, 2025
The calculated density altitude was 4,790 feet. Probable cause(s): The pilot’s failure to maintain clearance from trees after takeoff, during high density altitude weather conditions. The pilot was distracted, and flew too low, striking several approach lights short of the runway threshold.
Pilot Institute
MAY 4, 2024
In the Cessna 172S Pilot’s Operating Handbook (POH), the landing distance decreases by 10% for every 9 knots of headwind. For the Cessna 172, landing distance increases by 10% for every 2 knots of tailwind. Temperature An increase in temperature will increase the density altitude.
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