Rotor Brake System Flashcards
(26 cards)
With both engines off or disconnected, what speed is considered normal before the rotor brake can be applied?
Below 47% NR
Which aircraft systems provide the interlock inputs for the rotor brake?
Engine Mode Select Switches (EMSS), accessory drive system and Weight On Wheels (WOW) switch
Which electrical power supply is required to operate the rotor brake control and display functions?
28 Vdc essential busbar
Which component installed on the rotor brake control manifold opens when hydraulic pressure exceeds 180 bar and the brake lever is set in the PARK position?
Thermal relief valve
How long is the rotor brake system designed to hold the rotor head in the parked position with a full charge of nitrogen pressure in its accumulator?
8 hours
Where is the rotor brake disc located?
On the tail rotor drive take-off flange of the main rotor gearbox
What is the purpose of the self-adjustment pins incorporated into the rotor brake calliper assembly?
To provide an easy visual indication of rotor brake pad wear
Where is the rotor brake operating lever located?
On the right side of the engine control panel
Which two mechanical interlocks must be simultaneously made before the rotor brake lever can be moved into the “PARK” position?
“PARK” button depressed and rotor brake lever collar lifted
What prevents the rotor brake from being activated ON when the aircraft is in flight?
Weight On Wheels (WOW) relay (the brake off solenoid is energised via the WOW regardless of rotor brake lever position, which de-energisies the other three solenoids in the RBCV - preventing the remote possibility of an uncommanded rotor brake application)
With no electrical power applied to the aircraft, or if the rotor brake does not electrically release how can the rotor brake pressure be released safely?
By operation of the manual pressure release valve on the rotor brake control manifold
What will cause the CHK RBK warning to appear?
Incompatible switch selection between Eng Drive switch, EMSS and rotor brake lever - immeditae action is to undo the previous action.
What indication is displayed on the Warnings, Cautions and Advisories (WCA) when hydraulic pressure above 3.5 bar is applied to the rotor brake calliper?
The yellow “RTR BRK ON” (Rotor Brake On) caution illuminates
What type of rotor brake is on the Wildcat?
Electrically initiated, hydraulically operated
Which aircraft systems provide the interlock for the roto brake?
EMSS, ACC drive and WOW
Electrical power for the rotor brake comes from what source?
28Vdc Essential Busbar
How many pressure switches within the rotor brake control manifold?
2
If the rotor brake is at park and the electrical power is off what maintains the pressure at the rotor brake calipher?
The rotor brake accumulator
If 140 bar has been applied to the 1/3 Hydraulic system prior to the battery being switched off how long will the rotor brake hold the rotors at ‘PARK’
Minimum of 8 hours
What is the location of the rotor brake lever?
Right hand side of the engine control panel
What is the location of the rotor brake control manifold?
Bolted to the front face of the No.1 hydraulic system manifold on the left side of the cabin roof.
When the rotor brake has been selected to the ‘ON’ position what pressure is supplied to the rotor brake calliper?
55 bar
What conditions must be met for the rotor brake to be slected to the ON position?
No engines driving. NR must be below 47%
What is the purpose of the manual pressure release valve on the rotor brake control manifold?
To release the rotor brake in the event it is unsafe to apply electrical power or the rotor brake does not electrically release.
