take-off distance required (TODR)

‘take-off distance required (TODR)’ means:

(a)for helicopters (TODRH), the horizontal distance required from the start of the take-off to the point at which the take-off safety speed (VTOSS), the selected height and a positive climb gradient are achieved, following failure of the critical engine being recognised at the TDP, the remaining engines operating within approved operating limits;

(b)for VCA (TODRV), the horizontal distance required from the start of the take-off to the point at which the safe obstacle clearance and a positive climb gradient are achieved, following a critical failure for performance (CFP) recognised at the TDP;