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Airframe O's and P's > communication and navigation systems > Flashcards

communication and navigation systems Flashcards

1
Q

Name the basic components of a communication system.

A

They are the microphone transmitter, transmitting antenna, receiving antenna, receiver,
And headset or loudspeaker.

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2
Q

What is the most common communication system in use today?

A

VHF (very high frequency) system.

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3
Q

Which radio system is used for long range communication?

A

The HF (high frequency) system.

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4
Q

What is a transceiver?

A

It is a self-contained transmitter and receiver which share the same power supply, antenna and
tuning device.

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5
Q

What type of conductor is used for transmitting information between antennas and receiver/transmitters?

A

Coaxial cable

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6
Q

Describe a BNC type connector.

A

It is a connector used with coaxial cables that is fully seated after one quarter turn.

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7
Q

What are the components of a typical VOR system?

A

A receiver, visual indicator, frequency selector, antennas, and power supply.

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7
Q

What are the sensing elements of an autopilot system?

A

The directional gyro, turn-and-bank gyro, attitude gyro, and altitude control.

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8
Q

What are the basic components of an autopilot system?

A

The gyros, servos, amplifier, and flight control.

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9
Q

What are the actuating(output) elements of an autopilot system?

A

The servos which operate (actuate) the control surfaces.

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10
Q

What is the frequency of an emergency locator transmitter (ELT)?

A

It is 121.5, 243.0, and 406.0 MHz.

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11
Q

What are three types of servos used in autopilot system?

A

Hydraulic, pneumatic, and electric.

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11
Q

how does bonding help reduce radio interference?

A

by providing a low-impedance ground return.

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12
Q

How can you determine when the batteries of an ELT should be replaced?

A

By the date must be marked on the outside of the transmitter

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13
Q

Where is the preferred location for mounting a VOR antenna on the small aircraft?

A

The preferred location is on top of the forward part of the cabin
with the apex of the ā€œVā€ toward the front. An acceptable alternate location is on top of the vertical
stabilizer.

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14
Q

Describe the proper method of routing coaxial cable from the antenna to the receiver.

A

When installing coaxial cables, secure them along their entire length at intervals of two feet. To assure optimum operation, coaxial cables should not be routed or tied to
other wire bundles and be as short as possible. When bending coaxial cable, be sure that the bend is at least 10 times the size of the cable diameter.

15
Q

what are marker beacons ?

A

It is part of the ILS system, and is used to indicate the aircraft position on the approach to the Runway.

16
Q

Where should DME antennas be located?

A

On the lower surface of the aircraft fuselage, centerline.

17
Q

What is the indication of the middle marker beacon?

A

It is an amber light and an audible tone.

17
Q

Why are doublers required to be installed under aircraft skin when an antenna is mounted on the aircraft skin?

A

To prevent cracking in the skin.

18
Q

What is an ADF?

A

An automatic direction finder.

19
Q

What is one method used to monitor the output signal during an ELT test?

A

A VHF communications receiver tuned to 121.5 MHz.

20
Q

What information does a glide slope radio beam provide?

A

Vertical guidance for correct angle of descent.

20
Q

What does DME stand for?

A

Distance measuring equipment.

21
Q

how often does the ATC transponder require certification?

A

Every 24 calendar months.

22
Q

Why are two antennas or a single multi-element antenna usually required for an ILS system?

A

One for the localizer, and one for the glide slope receivers.

23
Q

What time of day should you perform the maintenance testes of an installed ELT?

A

The test should be conducted during the first 5 minutes after the hour, at any other time they should be coordinated with the nearest control tower or flight service station.

24
Q

What is VOR equipment used for?

A

Navigation.

25
Q

What powers an emergency locator transmitter (ELT)?

A

A self-contained battery.

Airframe O's and P's (11 decks)

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