– Landing distance : The horizontal distance from a
point where the helicopter is 50
ft (15.2 m) (25 ft for vertical
landings) above the landing
surface to the point where it is
brought to stop on the predeter-
mined area with one engine in-
operative.
– Balked landing : The interruption of a landing
approach and the start of a
climbout. Balked landing capa-
bility following an engine fail-
ure is assured at or before the
LDP.
– Balked landing distance : The horizontal distance from
the LDP to the point in the
balked landing profile at which
a minimum of 35 ft (10.6 m) is
attained at V
2
in a climbing
posture.
– Backup distance :
The horizontal distance from
the starting point of takeoff to
the TDP during vertical take-off
with backward flight procedure.
– Clear area : Any takeoff and landing sur-
face clear of obstacles where
the landing field length is not a
limiting factor.
– Short field :
Any takeoff and landing sur-
face clear of obstacles where
the landing field length is lim-
ited.
– Helipad :
Any identifiable surface on land
or structure used for the landing
and takeoff of helicopters.
RFM A109E
APPENDIX 12
E.A.S.A. Approved Page 9 of 88
Rev. 35
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