Rotor Brake Flashcards
Rotor Brake
Brake disc bolted to No. 8 sync shaft at rear of c box
3 piston hydraulic brake caliper bolted to airframe over disc and manual operated hydraulic master cylinder is mounted to cockpit overhead panel. Hydraulic fluid is supplied from reservoir located aft of forward gearbox
Electrical interlocks on ECLs prevent brake application at high engine power, mechanical interlocks prevent ECLs from being moved forward when brake is engaged
Rotor Brake Arming Lever
Mounted on ECL quadrant, marked ROTOR BRAKE - ARM/DISARM
At ARM, lever inserts mechanical lock preventing ECL from being advanced beyond GROUND position. Lever also de energizes the depressurization valve, closing the valve and allowing master cylinder to pressurize the fluid.
At DISARM, depressurization valve is energized open and all fluid pressure is dumped to the reservoir. Mechanical lock in throttle quadrant is removed, allowing ECLs to move to FLIGHT
To remove rotor brake, place lever into stowed position (DISARM) which will release pressure in rotor brake, releasing the pucks
Rotor Brake Operation
Arming lever set to ARM
Depress squeeze grip on lever handle, move handle forward to apply brake pressure. I full forward position the handle will lock into place
Action of moving lever forward moves a piston within master cylinder, causing rotor brake hydraulic fluid to pressurize and operate brake caliper
2 pressure switches (one on brake caliper and another on master cylinder) illuminate ROTOR BRAKE ON light when pressure exceeds 15psi
Third mechanical switch illuminates ROTOR BRAKE ON light when handle is out of stowed position
Rotor Brake - Normal Application
Apply brake below 40% RRPM with light to moderate pressure. Set brake handle fully forward after rotors have come to a complete stop if rotors are to be locked. Rotor brake applications below 35% should not be rapid.
Rotor Brake - Alternate Application
May be used if ground bounce (padding) is experienced.
ECLs... STOP ROTOR BRAKE lever... ARM APPLY... brake at 70% RRPM RELEASE... at 60% RRPM RRPM at 25%... apply brake again until rotors stop.
following use of rotor brake, a minimum interval of 15 minutes must be allowed before subsequent application