Aircraft Operations

III-2-1-2
Procedures — Aircraft Operations — Volume I
1.2.1.3 Mode 4 — Segregated parallel approaches/departures
Mode 4, Segregated parallel operations: In this mode, one runway is used for approaches and one runway is used
for departures.
1.2.1.4 Semi-mixed and mixed operations
1.2.1.4.1 In the case of parallel approaches and departures, there may be semi-mixed operations. In this scenario:
a) one runway is used exclusively for departures while the other runway accepts a mixture of approaches and
departures; or
b) one runway is used exclusively for approaches while the other runway accepts a mixture of approaches and
departures.
1.2.1.4.2 There may also be mixed operations, i.e. simultaneous parallel approaches with departures interspersed
on both runways.
1.2.1.4.3 Semi-mixed or mixed operations may be related to the four basic modes listed in 1.2.1.1 through 1.2.1.3
as follows:
a) Semi-mixed operations: Mode
1) One runway is used exclusively for approaches while:
i) approaches are being made to the other runway; or 1 or 2
ii) departures are in progress on the other runway. 4
2) One runway is used exclusively for departures while:
i) approaches are being made to the other runway; or 4
ii) departures are in progress on the other runway. 3
b) Mixed operations:
All modes of operation are possible. 1, 2, 3, 4
1.2.2.1 Normal operating zone (NOZ)
1.2.2 Definitions
(see Figure III-2-1-1)
1.2.2.1.1 This is airspace of defined dimensions extending to either side of an ILS localizer course and/or MLS
final approach track centre line. It extends from the runway threshold to the point where aircraft are established on the
centre line.
1.2.2.1.2 Only the inner half of the normal operating zone is taken into account in independent parallel
approaches.
23/11/06