(2)
In terms of altitude (QNH), if the flight is to be conducted in the vicinity of an airport or between adjacent airports at or below the Transition Altitude or altitudes concerned.

h.
FLIGHT LEVELS - The Flight Level or levels selected for a flight should:

(1)
Ensure adequate Terrain Clearance.

(2)
Satisfy Air Traffic Control requirements.

(3)
Be compatible with the cruising level requirements of the airway, or if off airway the magnetic tracks shown in the "Table of Cruising Levels" in the Enroute Supplement.

7-15 HOLDING PROCEDURES -
a. Pilots will not exceed the following maximum airspeeds when entering or established in the holding pattern.
Levels(1)  Normal conditions  Turbulence conditions 
Up to 4,250 m (14,000 ft) inclusive  425 km/h (230kt)(2) 315 km/h(170 kt)(4)  520 km/h (280 kt)(3) 315 km/h (170 kt)(4) 
Above 4,250 m (14,000 ft) to 6,100 m (20,000 ft) 
inclusive  445 km/h 
(240 kt)(5)  520 km/h (280 kt) or 
490 km/h  0.8 Mach, 
Above 6,100 m (20,000 ft) to 10,350 m (34,000 ft) inclusive  (265 kt)(5)  whichever is less(3) 
Above 10,350 m (34,000 ft)  0.83 Mach  0.83 Mach 
(1) The levels tabulated represent altitudes or corresponding Flight Levels depending upon the altimeter setting in use. (2) When the holding procedure is followed by the initial segment of an Instrument Approach Procedure promulgated at a speed higher than 425 km/h (230 kt), the holding should also be promulgated at this higher speed wherever possible. (3) The speed of 520 km/h (280 kt) (0.8 Mach) reserved for turbulence conditions shall be used for holding only after prior clearance with Air Traffic Control, unless the relevant publications indicate that the holding area can accommodate aircraft flying at these high holding speeds. (4) For holdings limited to CAT A and B aircraft only. (5) Wherever possible, 520 km/h (280 kt) should be used for holding procedures associated with airway route structures. 

b. Having entered the holding pattern, on the second and subsequent arrivals over the fix the aircraft is turned to fly an outbound track which will most approximately position the aircraft for the turn onto the inbound track.
c. CONTINUE OUTBOUND:
(1)
For 1 minute if at 4250 meters (14,000 feet) or below or for 1 1/2 minutes if above 4250 meters (14,000 feet) where timing is specified, or

(2)
Until the appropriate limiting DME is attained where distance is specified, then

d. Turn to realign the aircraft on the inbound track.
7-16 IDENTIFICATION OF AIR TRAFFIC SERVICE ROUTES - The ICAO has recommended adoption of a system of route designators to be used to identify controlled, advisory and uncontrolled Air Traffic Service routes worldwide through the recommended use of a combination of basic designators (alphanumeric), and supplementary prefixes and suffixes (alpha only). The system provides a uniform method of route identification which relates to regional, airborne navigation capability (i. e., RNAV versus non-RNAV equipped), airspace vertical structure, or aircraft category usage limitation considerations as follows:

a. BASIC DESIGNATORS
(1)
The letters A, B, G and R are used to identify routes which form part of the regional Air Traffic Service networks, but which are not RNAV routes.

(2)
The letters L, M, N and P identify RNAV routes which form part of the regional Air Traffic Service networks.

(3)
The letters H, J, V and W identify routes which do not form part of the regional Air Traffic Service networks, and which are not RNAV routes.
　
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