Airframes, Engines and Systems Flashcards
Bleed air systems on turbine powered helicopters are used for?
Reducing back pressure for starting
N1 accessory drive, drives?
Compressor, oil pump, fuel pump, and starter/ generator
The igniter plug
ignites the fuel/air mixture during start
Hydraulic accumulators are?
Used on some helicopters to store pressure in case of hydraulic pump failure
What is the primary purpose of the freewheeling unit?
To allow main rotor and tail rotor blades to continue spinning in event of engine failure
A tail rotor gearbox is used for providing
a right angle drive or has gearing for optimum tail rotor RPM
Tail rotors are driven by?
One or more drive shafts with flexible couplings
Do free turbine engines use a clutch unit?
No
Turbine powered helicopters use?
a.Alternators for electrical power and a separate starter for starting.
b.Generators for electrical power and a separate starter for starting.
c.Starter/alternator system for electrical power and for starting.
d.Starter/generator system for electrical power and for starting.
D
Alternators produce electrical power/current even at low RPM settings.
True or false?
True
The _____ shows the rate of flow being produced in the electrical system.
Loadmeter
How many times can a breaker be reset?
Once before engineer
In the event of an _____ failure, the ____ will provide power to the electrical system… for a limited time only!
generator, battery
Helicopters use chip detectors to
alert a pilot of abnormal wear in the engine, transmission, and gearboxes
Why do some helicopters have fuel pumps?
Fuel tank location does not have gravity to assist in feeding fuel to the engine.
To ensure a reliable flow of fuel regardless of manoeuvre.
- If the correct grade of fuel is NOT available
What will happen if you use higher octane?
What will happen if you use lower octane?
Decreased fuel efficiency
Risk of detonation
Hot fueling from drums should be done only:
a. under controlled conditions in compliance with CAR 602.09
b. during an emergency.
c. if it is approved in the Company Operations Manual.
d. All of the above.
D
What is the major hazard in fueling from a drum during winter operations?
Possibility of water from condensation in half filled drums (best practise to never leave a partial drum).
Possibility of rust contamination from seals
