"Equivalent"
might be too strong a word to describe this. If you are using the term "parking brake" to help a layman understand what an RTO braking system does, then the analogy may help. But you may also be in danger of confusing someone in to thinking that we try to get airborne with the parking brake on! Obviously, we would never make it in to the air get if we tried that little stunt!
RTO can be considered as a 'switch' that is set, ready to automatically apply maximum braking following the decision to discontinue a takeoff,
when certain conditions are met. In the Boeing 777, for example, these conditions occur when the Autobrake selector is set to RTO (armed) and:
- the aircraft is on the ground
- groundspeed is above 85 knots, and
- both thrust levers are retarded to idle.
It is worth bearing in mind that an RTO braking system will also incorporate the antiskid system, to prevent individual wheels locking up during the braking process. A parking brake would likely
not incorporate antiskid, because there is no need to when the aircraft is parked and static!
I hope this helps!
