Short-field takeoff and takeoff traps
Short-field takeoff: needed when runway is short. Match technique to the actual limit. Aircraft Flight Manual (AFM) gives configuration and flap setting for each case.
Short field (firm surface, reduced length):
- Configure for slowest safe liftoff speed (AFM flap setting: sometimes up, sometimes part-extended). Accelerate to it as fast as possible.
- Before brake release: run to full power, compare with manufacturer's static power figures. Shortfall: reduced performance, do not take off.
- Hold least-drag, near-cruise attitude through the roll.
- Do not raise nose until correct liftoff speed. Early rotation risks control trouble or a stall.
Two traps not about the surface:
| Trap | Mechanism | Effect |
|---|---|---|
| Tailwind aloft | Surface friction can leave "no wind" at ground, but enough wind a few feet up to hurt the climb | Tailwind: may not clear obstacles |
| Rolling takeoff | Roll started without stopping to line up; in some types, centrifugal force throws fuel to one side of tank | Outlet momentarily dry: engine-failure risk at a critical point |
- Tailwind aloft: plan for it whenever surface wind is calm or light and variable.
- Tailwind also reduces initial climb gradient (AWH 10.7.3).
Trap: a rolling takeoff can starve the engine via fuel slosh alone, unrelated to runway surface.
References
- TP 1102 Take-off: Take-offs From Firm Surfaces With Reduced Field Length
- TP 1102 Take-off: Tail Wind After Take-off
- TP 1102 Take-off: Performance
- FAA AWH 10.7.3 (Tailwind)