One reference is in AIM Chapter 7, Safety of Flight, Section 5, Potential Flight Hazards, paragraph 7, "Use of Runway Half-way Signs at Unimproved Airports"
Assuming that the runway length is appropriate for takeoff (considering runway condition and slope, elevation, aircraft weight, wind, and temperature), typical takeoff acceleration should allow the airplane to reach 70 percent of lift-off airspeed by the midpoint of the runway. The "rule of thumb" is that should airplane acceleration not allow the airspeed to reach this value by the midpoint, the takeoff should be aborted, as it may not be possible to liftoff in the remaining runway.
One reference is in AIM Chapter 7, Safety of Flight, Section 5, Potential Flight Hazards, paragraph 7, "Use of Runway Half-way Signs at Unimproved Airports"
ReplyDeleteAssuming that the runway length is appropriate for takeoff (considering runway condition and slope, elevation, aircraft weight, wind, and temperature), typical takeoff acceleration should allow the airplane to reach 70 percent of lift-off airspeed by the midpoint of the runway. The "rule of thumb" is that should airplane acceleration not allow the airspeed to reach this value by the midpoint, the takeoff should be aborted, as it may not be possible to liftoff in the remaining runway.