Chapter 12 - Aircraft Avionics Systems - Oral Questions

Question 1

What are the basic components of a radio communication system?

Answer 1

A microphone,

transmitter,

transmitting and receiving antennas,

receiver, and

speaker or headphones

Question 2

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

Answer 2

VHF band, 118.0 to 136.975

Question 3

What does the term ADF stand for?

Answer 3

Automatic Direction Finder

Question 4

What is the function of VOR equipment?

Answer 4

Navigation

Question 5

Name the components of a typical airborne VOR system

Answer 5

Receiver,

antennas,

frequency selector and

a visual display indicator

Question 6

What does DME stand for?

Question 7

At what interval must an ATC transponder system be certified?

Answer 7

Every 24 calendar months

Question 8

Why are two antennas usually required for an ILS system?

Answer 8

The localizer and glideslope signals are transmitted on different frequencies

Question 9

What information does the glideslope beam provide?

Answer 9

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

Question 10

What is the power source for an ELT

Answer 10

An internal battery

Question 11

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

Answer 11

Tune a comm receiver to 121.5

Question 12

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

Answer 12

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

Question 13

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

Answer 13

During the first 5 minutes after the hour and for no more than 3 sweeps

Question 14

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

Answer 14

Usually on the bottom of the fuselage so that it isn’t blocked by the wing during turns

Question 15

Describe the shape and location of a transponder antenna

Answer 15

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

Question 16

Name the basic components of an autopilot system

Answer 16

Gyros,

servos,

a controller, and

an amplifier or computer

Question 17

What are the sensing elements of an autopilot system?

Answer 17

Attitude,

directional,

and turning gyros,

and an altitude sensor

Question 18

What is the function of the servos in the autopilot system?

Answer 18

The servos actuate the flight controls

Question 19

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

Answer 19

To provide a low impedance ground return

Question 20

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

Answer 20

The cable should be supported every 2 feet,

bends should be 10 times the cable diameter, and

it should be routed separately (directly if possible)