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BLOCK LEVELS
On request from the pilot, a flightmay be cleared tooperatewithin controlled
airspacewithin a block level provided that other aircraft are not denied the
useof that airspace containedwithin that Block. Aglider or balloon cleared to
operate in controlled airspacewill be assignedblock levels.
Thepilot shall have complete freedom to change levelswithin the block,
provided that the upper and lower levels arenot exceeded. However, a
clearance to operatewithin a block level shall be cancelled or amended if
another aircraft requests the use of a level within the block.
When cancelling or amending a block level clearance, the aircraft operating
in a block level shall be instructed to climbor descend to an appropriate level
or block level in order to provide vertical separation from the other aircraft
requestingone of the levels. Aircraft at standard flight levelswill be afforded
priority over aircraft using non-standard flight levels.
enroute
3 – control l ed a i rspace