I’ve seen the situation countless times:
(and too many times at the event I just departed from in Boston)
An aircraft has exited the runway from landing, they have one or more runways to cross to get to parking.
They exit the runway from landing
“[Airport name] Unicom, [callsign] is clear of all runways”
They approach their first runway to cross
"[Airport name] Unicom, [callsign], crossing runway XX]
They clear the runway
"[Airport name] Unicom, [callsign] is clear of all runways]
They approach their second runway to cross
The above process repeats until they have cleared all the runways they will cross
This is NOT what should be happening. Clear of all runways has a key word in it, “all.”
Definition of “All”
all
/ôl/
predeterminer · determiner · pronoun
Used to refer to the whole quantity or extent of a particular group or thing.
This is the first definition, however, seeing that means the entirety of a group, it should mean, given the context “Clear of ALL Runways”, it means that once the pilot has no more runways to cross, they should use this command.
Using it every time you exit a runway clogs up the frequency, blocking any important transmissions on UNICOM. The only time it should be used multiple times at one airport by one user is in the event of a rejected takeoff, then it should only be sent twice, but I’ve heard it sent 16 times by one person before, however they were weaving through a runway, so without a troll, I’ve heard it 4 times by one user.
A Correct Example:
The user exits the runway
The user approaches the first runway to cross
“[Airport name] Unicom, [callsign] is crossing runway XX”
The user exits the runway and taxis to the next one to cross
“[Airport name] Unicom, [callsign] is crossing runway XX”
The user exits the runway
The process is continued until the user exits the last runway they will cross
“[Airport name] Unicom, [callsign] is clear of all runways”
It is not a difficult concept to understand, as “all” is a word many of us learned in pre-school, or kindergarten.
Summary
Clear of all runways is a message that should be sent on UNICOM only once, when the pilot is clear of all of the runways they will enter.