Explanations: Communication and Navigation Systems Flashcards
What is dutch roll?
an undesirable, low amplitude oscillation about both the yaw and roll axes. These oscillations are sensed by a rate gyro. Signals are sent to the rudder servo that provides the correct rudder movement to cancel these oscillations.
What is a ADF system?
Automatic direction finder (ADF) is an aircraft navigation product that automatically calculates the relative bearing of the aircraft to the radio station.
In what frequency band does and ADF system operate?
low- and medium- frequency bands.
The airborne equipment consists of a receiver, a loop (directional) antenna, a sense (nondirectional) antenna, and indicator, and a control unit.
What is the empennage of an aircraft?
The tail stabilizers
What is VOR navigation?
Very high frequency omni-directional range
What are ATC comunications?
Air traffic control coms.
In what range to WHF transmissions operate?
118.000 to 135.975 MHz.
What does the Flight Management Computer regulate?
the movement of the control surface actuators which control the stabilizers, elevators, rudders, speed brakes, and spoilers.
What is the GPWS?
Ground Proximity Warning System. It sense the nearness of the ground and warns the pilot if the aircraft has gotten too near the ground when it is not in a configuration for landing. It does this by monitoring the radar altimeter to determine the actual height above ground level.
It also monitors the air data computer, instrument landing system, and landing gear and flap position to determine if the aircraft is properly configured for its distance from the ground. If it is too near the ground for its location or configuration, the system will warn the pilot.
What does the auto response sent by the transponder allow the ATController to identify?
the aircraft itself.
What must be done when an ADF antenna is installed?
It is important that the loop antenna be checked for quadrantal error, which is the error caused by the metal in the aircraft structure distorting the electromagnetic field of the received signal. It causes azimuth inaccuracies, which are greatest between the four cardinal points with respect to the center line of the aircraft.
What function does a VOR antenna serve?
It is used for navigation. It receives signals from VOR ground stations, allowing aircraft to determine their radial position and navigate along specific airways.
What is the purpose of a DME antenna?
Distance measuring equipment: it aids in navigation, measuring the distance to the station.
What does an altitude encoder do?
it converts the aircraft pressure altitude into a code sent by the transponder to ATC.
