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in case of the critical power-unit failure occurring before
the TDP;
b) it is possible to continue the flight if the critical powerunit
failure occurs at or after the TDP. In this case, the
flight path of the helicopter may descend below the
height of the FAT0 in order to achieve VToSs if the
following conditions are satisfied:
1) A clearance margin is established in relation to the
elevated heliport or helideck itself and to all obstacles
located on the elevated heliport or helideck. 4.5 m
(15 ft) has been found appropriate to a wide range of
helicopters.
2) The vertical clearance above all obstacles not located
on the elevated heliport or helideck is at least equal to
10.7 m (35 ft). An obstacle is considered if its distance
from the flight path does not exceed 30 m or 1.5 times
the maximum dimension of the helicopter, whichever
is greater.
4.1.2 Initial climb
4.1.2.1 The take-off mass is such that the climb path
provides a vertical clearance af not less than 10.7 m (35 ft) for
VFR operations and 10.7 m (35 ft) -t 0.01 DR for IFR
operations above all obstacles located in the climb path, the
critical power-unit failure occurring at the TDP.
4.1.2.2 An obstacle is considered if its lateral distance
from the nearest point on the surface below the intended flight
path does not exceed 30 m or 1.5 times the over-all length of
the helicopter, whichever is greater, plus:
111 110 1 ATT A-2
Attachment A Annex 6 - Operation of Aircmfl
0.10 DR for VFR day operations
0.15 DR for VFR night operations
0.30 DR for IFR operations without electronic guidance
0.15 DR for IFR operations with electronic guidance
0.10 DR for IFR operations with ILS or MLS guidance
except obstacles may be disregarded if they are situated
beyond:
a) 7 R* for day operations if it is assured that navigational
accuracy can be achieved by reference to suitable visual
cues during the climb;
An obstacle is considered if its lateral distance from the
nearest point on the surface below the intended line of flight
does not exceed 30 m or 1.5 times the over-all length of the
helicopter, whichever is greater, plus:
0.10 DR for VFR day operations
0.15 DR for VFR night operations
0.30 DR for IFR operations without electronic guidance
0.15 DR for IFR operations with electronic guidance
0.10 DR for IFF! operations with ILS or MLS guidance
except obstacles may be disregarded if they are situated
beyond:
b) 10 R* for night operations if it is assured that
navigational accuracy can be achieved by reference to e) 7 R* for day operations if it is assured that navigational
suitable visual cues during the climb; accuracy can be achieved by reference to suitable visual
cues duhng the climb;
c) 300 m if navigational accuracy can be achieved by
navigation aids; and f) 10 R* for night operations if it is assured that
navigational accuracy can be achieved by reference to
d) 900 m in the other cases. suitable visual cues during the climb;
4.1.2.3 Where a change of direction of more than 15" is
made, obstacle clearance requirements are to be increased by g) 300 rn if navigational accuracy can be achieved by
5 m (15 ft) from the point at which the turn is initiated. This navigation aids; and
turn is not to be initiated before reaching a height of 30 m
(100 ft) above the take-off surface. h) 900 m in the other cases.
4.1.4.2 In case of a landing on an elevated heliport or
4.1.3 En route helideck, the flight path may descend below the height of the
landing surface in order to achieve VToss if the following
The take-off mass is such that it is possible, in case of the conditions are satisfied:
critical power-unit failure occumng at any point of the flight
path, to continue the flight to an appropriate landing site and a) A clearance margin is established in relation to the
achieve the minimum flight altitudes for the route to be flown. elevated heliport or helideck itself and to all obstacles
located on the elevated heliport or helideck. 4.5 m
4.1.4 Approach, landing and balked landing
(Figures A-7 and A-8)
(15 ft) has been found appropriate to a wide range of
helicopters.
b) The vertical clearance above all obstacles not located on
4.1.4.1 The estimated landing mass at the destination or the elevated heliport or helideck is at least equal to that
alternate is such that: specified in 4.1.4.1.
a) it does not exceed the maximum landing mass specified
in the flight manual, taking into account the parameters 4.2 Performance Class 2 helicopters
specified in 2.1;
b) the landing distance required does not exceed the 4.2.1 Take-08
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