Aircraft Operations

I-5-1-2
Procedures — Aircraft Operations — Volume I
1.2.4 Maximum area width
There is no maximum area width for routes within the coverage of the facilities defining the route. Outside the
coverage of the facilities defining the route, the area splays at 15°, as specified in 1.2.3, “Area without track guidance”.
1.3 CHARTING ACCURACIES
Charting accuracies are taken into account when establishing minimum en-route altitudes by adding both a vertical and
a horizontal tolerance to the depicted objects on the chart, as specified in PANS-OPS, Volume II, Part 1, Section 2,
Chapter 1, 1.8.
1.4 OBSTACLE CLEARANCE
1.4.1 The MOC value to be applied in the primary area for the en-route phase of an IFR flight is 300 m (1 000 ft).
In mountainous areas, this shall be increased depending on:
Variation in terrain elevation
Between 900 m (3 000 ft) and 1 500 m (5 000 ft)
Greater than 1 500 m (5 000 ft)
MOC
450 m (1 476 ft)
600 m (1 969 ft)
1.4.2 The MOC to be applied outside the primary area is as follows:
a) simplified method: in the buffer area, the MOC is equal to half the value of the primary area MOC; and
b) refined method: in the secondary area, the obstacle clearance is reduced linearly from the full clearance at the
inner edge to zero at the outer edge.
1.4.3 A minimum altitude is determined and published for each segment of the route.
1.5 TURNS
Turns can be executed overhead a facility or at a fix.
1.5.1 Protection areas associated with turns
1.5.2 Turn parameters
The parameters which are common to all turns appear in Table I-2-3-1 in Section 2, Chapter 3, “Turn Area
Construction”. The following parameters are specific to en-route turns:
23/11/06