Airframe Systems & Components: Communication & Navigation Systems 🔊

Question 1

Name the basic components of a communication system.

Answer 1

Microphone, transmitter, transmitting antenna, receiving antenna, receiver, and headset or loud speaker

Question 2

What is the most common communication system in use today?

Answer 2

VHF (Very High Frequency) System

Question 3

Which radio system is used for long range communication?

Answer 3

HF (High Frequency) System

Question 4

What is a transceiver?

Answer 4

A self-contained transmitter and receiver which shares the same power supply, antenna, and tuning device.

Question 5

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

Answer 5

Coaxial cable

Question 6

Describe a BNC type connector.

Answer 6

A connector used with coaxial cables that takes one quarter turn to fully seat.

Question 7

What are the components of a typical VOR (Very High Frequency Omni-range Navigation Equipment) System?

Answer 7

A receiver, visual indicator, dipole antenna, and power supply

Question 8

What are the basic components of an autopilot system?

Answer 8

Gyros, servos, and amplifiers

Question 9

What are the sensing elements of an autopilot system?

Answer 9

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

Question 10

What are the output elements of an autopilot system?

Answer 10

Servos which actuate the control surfaces

Question 11

What are three types of servos used in autopilot systems?

Answer 11

Hydraulic, pneumatic, and electric

Question 12

What is the purpose of a bonding jumper/wire on a radio shock mount?

Answer 12

To provide a low-impedance ground return and minimize radio interference from static electricity

Question 13

What is the frequency of an ELT (Emergency Locator Transmitter)?

Answer 13

121.5, 243.0, and 406.0 MHz (121.5 x 2 = 243)

Question 14

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

Answer 14

It is determined by the manufacturer. The date must be marked on the outside of the transmitter

Question 15

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

Answer 15

Secure them firmly along the entire length in 2 foot intervals. They should not be tied to other wire bundles and should be as short as possible. When bending, be sure the bend is at least 10 times the cable diameter.

Question 16

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

Answer 16

The preferred location is on top of the forward part of the cabin with the apex of the “V” toward the front. An acceptable alternative is on top of the vertical stab.

Question 17

Where should antennas be located?

Answer 17

On the lower surface in a position not blanketed by the wings when the aircraft banks

Question 18

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

Answer 18

To prevent cracking in the skin

Question 19

What are marker beacons?

Answer 19

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

Question 20

What is the indication of the middle marker beacon?

Answer 20

It is an amber light and an audible tone.

Question 21

What is an ADF?

Answer 21

Automatic direction finder

Question 22

What does DME stand for?

Answer 22

Distance measuring equipment

Question 23

What two parts make up the ILS system?

Answer 23

Localizer and glideslope

Question 24

Explain how to determine the pressure altitude to an airfield and how to set it in an altimeter.

Answer 24

Listen to ATC or tune into ATIS (Automatic Terminal Information Service) to hear the barometric pressure altitude. Then dial that setting on the altimeter in the Kollsman window. You could also dial in the known field elevation and the altimeter will reflect the barometric pressure.

Question 25

When can you test an ELT?

Answer 25

The first five minutes of every hour

Question 26

What is the purpose of the VOR?

Answer 26

Provides azimuth information for high or low altitude routes and airport approaches