I can not understand the term”cruise” perfectly. I know I should request ATC clearance to return to cruise altitude, if I leave cruise altitude to out side of the block.
Ex) Cleared cruise altitude 6000, MEA is 4000. The block is between 4000 to 6000. So I can descent or climb within the block without clearance. if I leave to out of block, i need ATC clearance for return to the block altitude
There are two which I am confused. First, Can I descent/climb several times without clearance within the block or just once is possible?
Second, When I leave assigned within the block, still should I request an