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when Mach number technique is applied, minimum longitudinal separation between turbojet aircraft on the same track, whether in level, climbing or descending flight shall be:
i)  10 minutes; or
ii)  between 9 and 5 minutes inclusive, provided:
the preceding aircraft is maintaining a Mach number greater than the following aircraft in accordance with the following table:
—  
9 minutes, if the preceding aircraft is Mach 0.02 faster than the following aircraft;

—  
8 minutes, if the preceding aircraft is Mach 0.03 faster than the following aircraft;

No. 2

III. Area Control Service

Figure III-22A (see 8.3.1.1.2)

Figure III-22B (see 8.3.1.1.2) Figure III-23A (see 8.3.1.2 c))

Figure III-23B (see 8.3.1.2 c))
No. 1

III. Area Control Service
—  
7 minutes, if the preceding aircraft is Mach 0.04 faster than the following aircraft;

—  
6 minutes, if the preceding aircraft is Mach 0.05 faster than the following aircraft;

—  
5 minutes, if the preceding aircraft is Mach 0.06 faster than the following aircraft.

 

8.4.4 When the 10-minute longitudinal separation minimum with Mach number technique is applied, the preceding aircraft shall maintain a Mach number equal to or greater than that maintained by the following aircraft.
8.5 Longitudinal separation minima based on distance using RNAV

Note.— Guidance material on RNAV operations is contained in the Manual on Required Navigation Performance (RNP) (Doc 9613).
8.5.1 Separation shall be established by maintaining not less than the specified distance between aircraft positions as reported by reference to RNAV equipment. Direct controller-pilot communications should be maintained, while such separation is used. Where high frequency or general purpose extended range very high frequency air-ground communication channels are used for area control service and are worked by air-ground communicators, suitable arrangements shall be made to permit direct controller-pilot communications, or monitoring by the controller of all air-ground communications.
8.5.1.1 To assist pilots to readily provide the required RNAV distance information, such position reports should, wherever possible, be referenced to a common way-point ahead of both aircraft.
8.5.2 RNAV distance-based separation may be applied between RNAV-equipped aircraft when operating on desig-nated RNAV routes or on ATS routes defined by VOR.
8.5.3 A 150 km (80 NM) RNAV distance-based separation minimum may be used on same-direction tracks in lieu of a 10-minute longitudinal separation minimum. When applying this separation minimum between aircraft on same-direction track, the Mach number technique (MNT) shall be applied, and the preceding aircraft shall maintain a Mach number equal to or greater than that maintained by the following aircraft.
8.5.4 Turbo-jet aircraft shall adhere to the Mach number approved by ATC and shall request ATC approval before making any changes thereto. If it is essential to make an immediate temporary change in the Mach number (e.g. due to turbulence), ATC shall be notified as soon as possible that such a change has been made.
8.5.4.1 If it is not feasible, due to aircraft performance, to maintain the last assigned Mach number during en-route climbs and descents, pilots of aircraft concerned shall advise ATC at the time of the climb/descent request.
8.5.5 RNAV distance-based separation minima shall not be applied after ATC has received pilot advice indicating navigation equipment deterioration or failure.
8.5.6  Aircraft at the same cruising level
8.5.6.1 Aircraft on the same track. (See Figure III-24.) A 150 km (80 NM) RNAV distance-based separation minimum may be used provided:
a)  each aircraft reports its distance to or from the same “on-track” way-point; and
　
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