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Why do helicopters have green windows?
These windows reduce the amount of light that gets through to the cockpit by 30 percent. That in turn lowers cockpit temperatures. Installation of the windows is still the same as called out in both TM 1-1520-280-23&P and TM 1-1520-237-23&P.
What is the purpose of the free wheeling unit in a helicopter drive system?
The freewheeling unit automatically disengages the engine from the main rotor when engine revolutions per minute (rpm) is less than main rotor rpm. [Figure 4-12] This allows the main rotor and tail rotor to continue turning at normal in- flight speeds.
How do helicopters Yaw?
Yaw control is achieved by increasing the blade pitch on one rotor while decreasing the pitch on the other. The result is a differential in torque, resulting in a yawing motion.
Do police helicopters have mounted guns?
But while police officers have been trained to use helicopter-mounted . 50-caliber machine guns against light planes, there was no intention to take down commercial passenger jets with such weaponry, said the official, who asked not to be identified.
Why do helicopters circling at night?
If the police helicopter is flying overhead in circles, they are working some sort of mission. The spotlight, called a Night Sun, is just one of many tools the helicopter has to complete a mission.
What must be done after a helicopter is statically rigged?
After completion of the static rigging, a functional check of the flight control system must be accomplished.
How does a helicopter fuel system work?
Most non-gravity feed fuel systems contain both an electric pump and a mechanical engine-driven pump. The electrical pump is used to maintain positive fuel pressure to the engine pump and may also serve as a backup in the event of mechanical pump failure. The electrical pump is controlled by a switch in the cockpit.
Why does a helicopter have a wind vane?
Many helicopters “wind vane” pretty well, that is that they stay aligned with the relative wind at high speed. It could be that the helicopter you were in was travelling at a high enough rate of speed that a large (or any) correction was not needed to maintain proper alignment.
Is it dangerous to fly a helicopter uncoordinated?
The main risk of uncoordinated flight in an airplane is the possibility of entering a spin. But helicopters don’t spin, and uncoordinated flight is not dangerous in them in the same way as in fixed-wings. This means that helis can fly at any angle to the direction of flight, which is one of the main benefits of flying them.
Do you need to use yaw pedals to yaw?
It is this yawing affect that would be compensated by pedal input. Helicopters effectively tilt the lift vector to the side where they need to go to, there is no adverse yaw effect that requires compensation from the pedals.
What does the yaw string on a Helis mean?
This means that helis can fly at any angle to the direction of flight, which is one of the main benefits of flying them. That being said, helis are equipped with a flight instrument invented by the Wright Brothers — the yaw string.