– Takeoff decision point (TDP) : It is the last point in the take off
path at which, as result of
power unit failure, a rejected
takeoff can be assured, and the
first point at which a completed
takeoff can be assured.
– Landing decision point (LDP) : It is the last point on landing
path that permits, if a single
engine failure is experienced,
either to land on a predetermi-
nated area or to maintain a
single engine forward flight.
– Takeoff distance : The horizontal distance from
the start of the prescribed take-
off procedure to a point at least
35 ft (10.6 m) above the take-
off surface where V
2
and a
positive rate of climb are at-
tained following an engine fail-
ure occuring at or after TDP.
– Rejected takeoff distance : The horizontal distance from
the start of takeoff procedure to
the point where the helicopter
lands and stops safely follow-
ing an engine failure occuring
at or prior to TDP.
– Takeoff flight path : The distance travelled from
where the helicopter reaches V
2
at or above 35 ft (10.6 m) AGL
to 1000 ft (305 m) AGL.
– Takeoff safety speed or balked land-
ing safety speed (V
2
) : The airspeed that assures the
required climb performance in
OEI condition.
RFM A109E
APPENDIX 12
Page 8 of 88 E.A.S.A. Approved
Rev. 35
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