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

I-4-6-6 Procedures — Aircraft Operations — Volume II
23/11/06
6.3.4 Alignment
Wherever practical the missed approach track should be a continuation of the final approach track. Missed approaches
involving turns are permitted (see 6.4, “Turning missed approach”), but should only be employed when an operational
advantage may be obtained.
6.3.5 Obstacle clearance for the straight missed approach
The general criteria apply as stated in 6.2, “Climb gradient and MOC”.
6.4 TURNING MISSED APPROACH
6.4.1 This section contains the criteria for a turning missed approach for turns of more than 15 degrees. For turns
less than or equal to 15 degrees, the criteria for a straight missed approach apply. See 6.3, “Straight missed approach”,
above. Turns may be defined as occurring at:
a) an altitude/height;
b) a fix or facility; or
c) the MAPt.
6.4.2 General
If a turn from the final approach track is specified, turning missed approach areas must be constructed. The criteria in
6.3, “Straight missed approach” above remain in effect until the following:
a) the turning point (TP) for turns specified by altitude/height (see 6.4.5, “Turn initiated at a designated
altitude/height”); and
b) the earliest TP for turns at a designated TP (see 6.4.6, “Turn initiated at a designated turning point”). To obtain
the minimum OCA/H it may be necessary to adjust the designated turn altitude or turning point (TP). The
number of variables is such that this may involve a trial and error process.
Note.— All calculations in this chapter are made for the 2.5 per cent nominal gradient. See 6.2.2 for use of
gradients other than 2.5 per cent.
6.4.3 Turn parameters
This section shows the parameters on which the turn areas are based, together with the variables which represent them
in the drawings.
a) Altitude: Aerodrome altitude plus 300 m (1 000 ft) or the defined turn altitude.
b) Temperature: ISA + 15°C corresponding to a) above.