Communication and Navigation Systems Flashcards

1
Q

What are the basic components of a radio communication system?

A

A microphone, a transmitter, Transmitting and receiving antennas, receiver, and speakers or headphones

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2
Q

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

A

The VHF (very high frequency) Band (118.0 to 136.975 MHZ)

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3
Q

What does the term ADF stand for?

A

Automatic direction finding (finder)

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4
Q

What is the function of a VOR equipment?

A

Navigation

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5
Q

Name the components of a typical airborne VOR navigation system?

A

A receiver, antennas, frequency selector and 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 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 of 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 communication receiver to 121.5MHZ

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12
Q

How would you know if the batteries in an ELT are due for 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 5 minutes after the hour and for no more than 3 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, servo, a controller and 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 autopilot system?

A

the servo actuates the flight controls

19
Q

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

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 2ft, bends should be 10 times the cable diameter, and it should be routed separately from other wires.