Bell Jet ranger rotor brake to be applied below 38% NR (Rotor speed)
Tend to find the smooth application of the brake to full on at this speed is enough to warm the disks and allows the rotor to stop nice and smooth without judder or vibration. If the brake is applied at around 30% and below the cold disks catch and bind causing a horrible judder and shudder from the MRGB. Then its a case of small applications to bring the speed down.
Bell 206 does not have Lead/lag dampers so no for and aft movement of the blades.
Rotor brake on 206 is Hydralic and just like a car brake. Sometimes Hydralic pressure is low/fluid is low so you pump the lever to build the pressure.
Im not an engineer but i treat the aircraft like its made of glass, wish others would too!
