Originally Posted by
wellcamp_spud_7500
climbing to is the only phrase to exist within AIP there is no such thing as "on climb"
But why do you need the 'to' in there anyways? You should never say "turn right heading to three five zero". 'To' is a word that adds nothing to the message trying to be communicated, yet has the potential to cause confusion as 'To' could mean 'Two'.
"Alpha Bravo Charlie, climbing to 5000". Is it 5000 or 25000?