Aircraft Operations

I-3-3-2
Procedures — Aircraft Operations — Volume I
3.3.3 The omnidirectional departure procedure is designed using any one of a combination of the following:
a) Standard case: Where no obstacles penetrate the 2.5 per cent obstacle identification surface (OIS), and 90 m
(295 ft) of obstacle clearance prevails, a 3.3 per cent climb to 120 m (394 ft) will satisfy the obstacle clearance
requirements for a turn in any direction (see Figure I-3-3-1 — Area 1).
b) Specified turn altitude/height: Where obstacle(s) preclude omnidirectional turns at 120 m (394 ft), the
procedure will specify a 3.3 per cent climb to an altitude/height where omnidirectional turns can be made (see
Figure I-3-3-1 — Area 2).
c) Specified procedure design gradient: Where obstacle(s) exist, the procedure may define a minimum gradient of
more than 3.3 per cent to a specified altitude/height before turns are permitted (see Figure I-3-3-2 — Area 3).
d) Sector departures: Where obstacle(s) exist, the procedure may identify sector(s) for which either a minimum
gradient or a minimum turn altitude/height is specified (e.g. “climb straight ahead to altitude/height ... before
commencing a turn to the east/the sector 0°–180° and to altitude/height ... before commencing a turn to the
west/the sector 180°–360°”).
C/L
Area 2
30°
Area 1
15° 15°
3.5 km
(1.9 NM)
or less
d r
d r
= distance where the aircraft climbing at the minimum
gradient (3.3% or the gradient specified in the procedure,
whichever is the higher) will have reached the specified
turn altitude/height. If the turn height is 120 m (394 ft)
above the DER, this distance is 3.5 km (1.9 NM)
for a 3.3% gradient.
DER
150 m
Runway
150 m
Area bounded by the dotted line
is the turn initiation area.
600 m
Figure I-3-3-1.
Areas 1 and 2 and turn initiation area for omnidirectional departures
23/11/06