The phrase “unable to comply” is used _______ ．
Aby the controller before he amends the clearance or instruction
Bby the pilot to advise the controller he cannot carry out the clearance or instruction received
Cby the pilot before he takes action on the clearance or instruction received
Dby the controller to inform that he cannot comply with the pilot’s requirement
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eed (CAS)is to be used only as necessary to comply with any applicable requirements of the certific
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