Utility Flashcards
What is the function of the blade de-ice system?
The blade de-icing system provides for de-icing of the main and tail rotor blades and droop stops.
What relay prevents the windshield anti-ice from being activated while the back-up pump is operating on priority two power? Where is it located?
The system is also automatically shut off if the auxiliary power unit (APU) generator is the only source of electrical power and the backup hydraulic pump is on. Under these conditions, 28 vdc from the APU is applied through the normally closed contacts of No. 2 and No. 1 ac generator contactors K2 and K1, through the energized contacts of APU/external power contactor K3, and the energized contacts of hydraulic emergency relay K19 to energize automatic cutout relay K21. With K21 energized, the 28 vdc is removed from the anti-ice controller and the system shuts off. Located on the RH Relay Panel.
How does the windshield anti-ice system prevent ice accumulation?
The anti-ice system applies three-phase, 115 vac power to heater elements within the windshield to keep a temperature of 70°F to 115°F (21.1°C to 46.1°C) on the windshield surface.
How many windshield anti-ice controllers are there?
3 total. One on each windshield.
What occurs when pulling the ENG EMER OFF T-handles?
Pulling a T-handle arms the fire extinguisher circuit for the engine compartment selected. It also shuts off fuel to the affected engine.
Each windshield is made up of _____________ and ____________.
The system consists of heater elements and temperature sensors in the pilot’s and copilot’s windshields, pilot’s and copilot’s anti-ice controllers on the right and left sides of the cabin overhead, and control switches on the upper console. The system also consists of heater elements and temperature sensors in the center windshield and center anti-ice controller on the left side of the cabin overhead, and a control switch on the upper console.
BONUS QUESTION: There are two heating zones on each windshield, true or false?
False 3
Power to the wiper system is supplied by what?
The No. 1 primary AC bus through the WSHLD WIPER circuit breaker on the copilot circuit breaker panel.
The Windshield Anti-ice System is designed to prevent ice accumulation by utilizing what?
Three phase heating elements attached to the laminated glass windshield.
The heating and ventilation system consists of what?
A heating system with a winterized subsystem, a ventilation system, heat and ventilation controls
Electrically heated pitot static tubes are located where?
On the cockpit roof above and aft of the pilot and copilot door.
The fire detection system consists of what?
Consists of three control amplifiers; five radiation sensing fire detectors sensors; No. 1 and No. 2 engine T-handle fire warning lights, an APU T-handle fire warning light, and a Test.
The Inertia Impact Switch is what?
A crash-actuated system is part of the fire extinguisher system. An Omni-directional inertia switch is hard-mounted to the airframe to sense crash forces
The blade de-icing system provides?
De-icing of the main and tail rotor blades and droop stops
