Aircraft Operations. Volume II - Construction of Visual and Instrument ...

I-3-2-2 Procedures — Aircraft Operations — Volume II
23/11/06
2.3 BEGINNING OF THE DEPARTURE PROCEDURE
2.3.1 Aeroplanes
2.3.1.1 For aeroplanes the departure procedure begins at the departure end of the runway (DER), which is the end
of the area declared suitable for take-off (i.e. the end of the runway or clearway as appropriate.)
2.3.1.2 Since the point of lift-off will vary, and in order to protect for turns prior to the DER, the protected area
begins at a point 600 m from the start of runway. This is based on the assumption that the minimum turn height of
120 m (394 ft) above the elevation of the DER could be reached 600 m from the start of runway.
Note.— The elevation of the DER is the elevation of the end of the runway or the elevation of the end of the
clearway, whichever is higher.
2.3.2 Helicopters
2.3.2.1 For helicopters, the departure procedure begins at the departure end of the runway (DER). The DER is the
end of the area declared suitable for take-off (i.e. end of the runway or clearway or the end of the final approach and
take-off (FATO) area).
2.3.2.2 To account for the climb performance of helicopters, and to protect for early turns, the protected area
commences at the beginning of the runway or area available for take-off based on the assumption that the minimum
turn height of 90 m (295 ft) above the elevation of the DER could be reached overhead the start of takeoff (see
Figure II-3-2-1).
Note.— The elevation of the DER is the higher of the elevations of the beginning and end of the runway/FATO.
2.4 END OF THE DEPARTURE PROCEDURE
The departure procedure ends at the point where the PDG reaches the minimum altitude/height authorized for the next
phase of flight (i.e. en-route, holding or approach).
2.5 MINIMUM OBSTACLE CLEARANCE (MOC)
2.5.1 The minimum obstacle clearance (MOC) in the primary area is 0.8 per cent of the distance flown from the
DER. The MOC is zero at the DER.
2.5.2 The MOC is provided above an obstacle identification surface or, where an obstacle penetrates the OIS,
above the elevation of the obstacle.
2.5.3 In addition to the above prior to the commencement of a turn of more than 15 degrees, MOC of 90 m
(295 ft) (Cat H, 80 m (265 ft)) is required.
2.5.4 Where mountainous terrain is a factor, consideration shall be given to increasing the minimum obstacle
clearance (see Section 2, Chapter 1, 1.7, “Increased altitudes/heights for mountainous areas”).