Airframe Systems & Components: Communication & Navigation Systems š Flashcards
Name the basic components of a communication system.
Microphone, transmitter, transmitting antenna, receiving antenna, receiver, and headset or loud speaker
What is the most common communication system in use today?
VHF (Very High Frequency) System
Which radio system is used for long range communication?
HF (High Frequency) System
What is a transceiver?
A self-contained transmitter and receiver which shares the same power supply, antenna, and tuning device.
What type of conductor is used for transmitting information between antennas and receiver/transmitters?
Coaxial cable
Describe a BNC type connector.
A connector used with coaxial cables that takes one quarter turn to fully seat.
What are the components of a typical VOR (Very High Frequency Omni-range Navigation Equipment) System?
A receiver, visual indicator, dipole antenna, and power supply
What are the basic components of an autopilot system?
Gyros, servos, and amplifiers
What are the sensing elements of an autopilot system?
The directional gyro, turn-and-bank gyro, attitude gyro, and altitude control
What are the output elements of an autopilot system?
Servos which actuate the control surfaces
What are three types of servos used in autopilot systems?
Hydraulic, pneumatic, and electric
What is the purpose of a bonding jumper/wire on a radio shock mount?
To provide a low-impedance ground return and minimize radio interference from static electricity
What is the frequency of an ELT (Emergency Locator Transmitter)?
121.5, 243.0, and 406.0 MHz (121.5 x 2 = 243)
How can you determine when the batteries of an ELT should be replaced?
It is determined by the manufacturer. The date must be marked on the outside of the transmitter
Describe the proper method of routing coaxial cable from the antenna to the receiver.
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.
Where is the preferred location for mounting a VOR antenna on a small aircraft?
The preferred location is on top of the forward part of the cabin with the apex of the āVā toward the front. An acceptable alternative is on top of the vertical stab.
Where should antennas be located?
On the lower surface in a position not blanketed by the wings when the aircraft banks
Why are doublers required to be installed under aircraft skin when an antenna is mounted on the aircraft skin?
To prevent cracking in the skin
What are marker beacons?
It is part of the ILS system and is used to indicate the aircraft position on the approach to the runway.
What is the indication of the middle marker beacon?
It is an amber light and an audible tone.
What is an ADF?
Automatic direction finder
What does DME stand for?
Distance measuring equipment
What two parts make up the ILS system?
Localizer and glideslope
Explain how to determine the pressure altitude to an airfield and how to set it in an altimeter.
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.
When can you test an ELT?
The first five minutes of every hour
What is the purpose of the VOR?
Provides azimuth information for high or low altitude routes and airport approaches
