Aircraft Avionics Systems Flashcards

1
Q

What are the basic components of a radio communication system?

A

Microphone.
Transmitter.
Transmitting and receiving antennas.
Receiver.
Speaker or headphones.

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2
Q

What frequency range is used by most modern voice communication systems?

A

The VHF band (118.0 to 136.975 MHz.)

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3
Q

What does the term ADF stand for?

A

airborne direction finder

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4
Q

What is the function of VOR equipment?

A

Navigation.

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5
Q

Name the components of a typical airborne VOR navigation system:

A

Receiver.
Antenna.
Frequency selector.
Visual display indicator.

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6
Q

What does DME stand for?

A

Distance measuring equipment.

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7
Q

At what interval must an ATC transponder system be certified?

A

Every 24 calendar months.

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8
Q

Why are two antennas usually required for an ILS (instrument landing system) system?

A

The localizer and glideslope signals are transmitted on different frequencies.

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9
Q

What information does the glideslope beam provide?

A

Vertical guidance to enable the aircraft to maintain the correct descent angle.

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10
Q

What is the power source for an ELT (emergency locator transmitter)?

A

An internal battery.

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11
Q

Describe one method of monitoring the signal output during an ELT test:

A

Tune a communications receiver to 121.5 MHz.

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12
Q

How would you determine if the batteries in an ELT are due for a recharge or replacement?

A

By looking for an expiration date for recharge or replacement on the battery and/or in the aircraft maintenance records.

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13
Q

At what time is a test of an installed ELT permitted?

A

During the first five minutes after the hour, and no more than three sweeps.

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14
Q

Where on the aircraft would you expect to find a DME antenna?

A

Generally, on the bottom of the fuselage in a location that isn’t blocked by the wing during turns.

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15
Q

Describe the shape and location of a transponder antenna.

A

Either a short blade or a short wire with a ball end located on the bottom of the fuselage.

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16
Q

Name the basic components of an autopilot system:

A

Gyros.
Servos.
A controller.
An amplifier or computer.

17
Q

What are the sensing elements of an autopilot system?

A

Attitude, directional, and turning gyros.
And an altitude sensor.

18
Q

What is the function of the servos in an auto pilot system?

A

The servos actuate the flight controls.

19
Q

What is the purpose of a bonding jumper from a radio shock mount to the air frame?

A

To provide a low impedance ground return.

20
Q

Describe the procedure used to route coaxial cable from an antenna to a receiver.

A

The cable should be supported every 2 feet.

Bends should be 10 times the cable diameter.

It should be routed separately from other wires.