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APPENDIX A
INTERMEDIATE FLIGHT PREPARATION WORKBOOK
Distance to 50-Foot Obstacle
Distance to 50-foot obstacle is defined as the sum of the takeoff ground run distance to lift-off,
plus the airborne horizontal distance needed to accelerate and climb to arrive at the 50-foot
obstacle height at or above the obstacle Climbout Speed (VCO).
Takeoff Speed
Takeoff speed is defined as that speed which permits attaining the obstacle VCO at or before
reaching the 50-foot obstacle height above the runway.
Stall Speed
Stall Speed (VS) is the higher of:
1.  The airspeed at which the aircraft will cease to fly due to the loss of aerodynamic lift during
the application of slow smooth control inputs.
2.
The minimum steady flight speed at which the aircraft is controllable.
Climbout Speed
Climbout Speed (VCO) is the scheduled single-engine climbout speed and should be obtained at
or prior to reaching the 50-foot obstacle height. Due to the excess thrust available with two
engines operating, the 2-engine climbout speed is 10 knots greater or VCO + 10 knots.
Final Segment Climb Speed
The climbout speed from 400 feet above the airfield elevation to the end of the takeoff flightpath
(2200 feet above the airfield elevation for 1 engine inoperative) is 125% of VS at the takeoff
weight. This is approximately VCO + 15 knots.
Climbout Factor
Climbout Factor is the variable used to determine takeoff/climb performance and obstacle
clearance. Minimum climbout factor for all takeoffs is 2.5.
Rate of Climb
Rate of Climb is the time rate of change of geometric altitude. This is also sometimes referred to
as Tapeline Rate of Climb. Charts which schedule performance based on rate of climb are
calculated on actual (gross) rate of climb.
A-6 GLOSSARY


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