Chinook Rotor Brakes
Bomber,
In the foggy recesses of my alcohol ravaged brain lurks a thought the Chinook originaly had rotor brakes but they had a very bad tendency to turn the disks into sickles suitable for harvesting grain and starting fires, thus they were removed very early on and were not used. That may be a prior to the latest models or the Spec Ops MH series however but I know they were not on the A,B,or C models.
The prototype aircraft in the fleet that we used at Fort Rucker for conversion training (serial numbers...1-10) as I recall had a wee On-Off toggle switch for the rotorbrake down on the center console. (no promise that is the case but that is my recollection). One of the first few Chinooks is now in the Fort Rucker Museum....reminds me of my own Sell by Date situation. They also had the small dual aft wheels vice the single large aft wheel configuration.
During shutdown, the APU powers the aircraft systems and upon shutting the APU off, a lot of additional drag is applied to the rotor system which assists in slowing the rotors to a stop.
I do not know of any cases of ground resonance with the Chinook although I can imagine it did happen. I do remember what we call Thrust Bounce which resulted from a weak Magnetic Brake on the Thrust (Collective for you single rotor guys) Lever. That could give every resemblence to Bronco Busting rides if not corrected in a timely fashion. Broncs can give a fun ride but get 45,000 pounds of Chinook hopping about could prove entertaining to bystanders trying to figure out what kind of stunt you were trying to pull off.