Communication and Navigation Systems Flashcards
Installed radio equipment is protected from damage due to jolts and vibrations by
shock mounts
Radio equipment is bonded to the aircraft in order to
provide a low impedance ground and to minimize radio interference from static electrical charges
When must the radio station licence be displayed in an aircraft equipped with a two-way radio?
When the aircraft is operated outside the US
When would a U.S. resident NOT be required to hold a Federal Communication Commision (FCC) Restricted Radio Telephone Operated Permit to operate two-way aircraft VHF radio?
When flying or communicating within the United States
Part of the ADF system used on coaxial cable, it should be secured firmly along its entire length
at 2 foot intervals
When must the emergency locator transmitter (ELT) battery be replaced (other than reading the replacement date)?
When the transmitter has been used for more than one cumulative hour
An emergency locator transmitter (ELT) battery must be capable of furnishing power for signal transmission for at least
48 hours
The preferred location of an ELT is
as far aft as possible but forward of the empennage
An emergency locator transmitter (ELT) is normally activated by an inertial switch or equivalent mechanism if subjected to a force of prescribed intensity and duration. It must activate when the force is applied
parallel to the longitudinal axis of the aircraft
How may the battery replacement date be verified for an emergency locator transmitter
By observing the battery replacement date marked on the outside of the transmitter
How may the operation of an installed emergency locator transmitter (ELT) be verified during aircraft inspection?
By tuning a communication receiver to the civil emergency frequency and activating the ELT momentarily at five minutes after the hour
How long can an aircraft fly without an ELT?
90 days
Static dischargers help eliminate radio interference by dissipating static electricity into the atmosphere at
low current levels
Long range Navigation (LORAN) systems determine aircraft location by
means of pulsed signals transmitted from ground stations
Aircraft antenna must be grounded to the
airframe
VHF radio signals are commonly used in
both VOR and ATC communications
On modern large aircraft, what electronic device typically monitors flight parameters and performs autopilot functions?
Flight management computer
In the landing configuration, GPWS typically monitors the radio (radar) altimeter, air data computer, instrument landing system and
landing gear and flap positions
In general, the purpose of an aircraft transponder is to
receive an interrogation signal from a ground station and automatically send a reply back
When an antenna is installed, it should be fastened
so that loads imposed are transmitted to the aircraft structure
After an automatic direction finding antenna has been installed, the
loop must be calinratedq
Doublers are used when antennas are installed to
reinstate the structural strength of the aircraft skin
One antenna can be used for the radio range and standard broadcast bands in light aircraft because the
two ranges are close together
What characteristics of the installation of a rigid antenna on a vertical stabilizer should be evaluated?
Flutter and vibration
A gasket or sealant is used between the antenna mast and fuselage skin
to prevent the entry of moisture
The preferred location of a VOR antenna on light aircraft is on
top of the cabin with apex of the V pointing forward
The purpose of a localizer is to
align the plane with the centre of the runway
A DME antenna should be installed on the aircraft in a position that will
not be blanked out by the wing when the aircraft is banked
When bonding coaxial cable, the bend radius should be atleast
10 times the diameter of the cable
When installing a DME antenna, it should be aligned with the
centreline of the airplane
The addition of avionics and associated systems forward of the CG limit will affect
empty weight and useful load
How much clearance from the seat bottom is required when installing radio equipment under a seat?
1 inch with the seat occupied and subjected to maximum downward seat spring deflection
The purpose of the glidescope system is to
assist the pilot in making a correct angle of descent to the runway
