Fixed+Rotary (aircraft, not washing lines)
Join Date: Jan 2005
Location: Peak District, Yorkshire, UK
Age: 56
Posts: 357
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As a PPL in training I've had this drummed into me from my instructor and also have been directed to the various authoritative texts on the subject...
Extracts from the CAA CAP413 Radiotelephony Manual
"An ATC route clearance is NOT an instruction to take-off or enter an active runway. The words 'TAKE-OFF' are used only when an aircraft is cleared for take-off. At all other times the word 'DEPARTURE' is used."
"Meticulous care has been taken to ensure that the phraseology which is to be
employed during the pre-departure manoeuvres cannot be interpreted as a take-off
clearance. This is to avoid any misunderstanding in the granting or acknowledgement
of take-off clearances and the serious consequences that could result."
"A take-off clearance shall be issued separately from any other clearance message."
"TAKE-OFF - these words are only used when an aircraft is cleared for TAKE-OFF."
"TAKE-OFF clearance requires readback."