Comms and Navs System Flashcards
What is the operating principle of the sensing device used in an autopilot system?
The relative motion between a gyro and its supporting system.
What is the primary purpose of an autopilot?
To relieve the pilot of control of the aircraft during long periods of flight.
(Refer to figure 27.) What kind of antenna is this?
A radar beacon transponder antenna.
In an autopilot, which signal nullifies the input signal to the ailerons?
Follow-up signal
(Refer to figure 31.) What kind of antenna is this?
A marker beacon receiver antenna.
When operationally checking an autopilot system on the ground, after the aircrafts main power has been switched on, the autopilot should be engaged
Only after the gyros come up to speed and the amplifier warms up.
Doubles are used when antennas are installed to
Reinstate the structural strength of the aircraft skin.
(Refer to Figure 33.) What kind of antenna is this?
A VOR/glide slope antenna
1) Use solder to attach bonding jumpers on radio equipment.
2) Radio equipment is bonded to the aircraft in order to provide a low-impedance ground and to minimize radio interference from static electrical charges.
Regarding the above statements,
Only no.2 is true
What component of an autopilot system applies torque to the control surfaces of an aircraft?
Servo
(Refer to Figure 25.) What kind of antenna is this?
A canted antenna.
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 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.
An emergency locator transmitter (ELT) battery must be capable of furnishing power for signal transmission for at least
48 hours
Which of the following provides manual maneuverability of the aircraft while the autopilot is engages?
Flight controller
(Refer to Figure 23.) What is this antenna used for?
This is an altitude encoder used with transponders
The elevator channel of an autopilot controls the aircraft about which axis of rotation?
Lateral
After an automatic direction finding antenna has been installed, the
loop must be calibrated.
What characteristics of the installation of a rigid antenna on a vertical stabilizer should be evaulyated
Flutter and vibration
(Refer to Figure 15.) What is the approximate drag load on an antenna with a frontal area of .137 square feet installed on an aircraft with a speed of 275 mph?
3.387 pounds
The purpose of a localizer is to
Align the airplane with the center of the runaway.
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 bending coaxial cable, the bend radius should be at least
10 times the diameter of the cable.
When must the radio station license be displayed in an aircraft equipped with a two-way radio?
When the aircraft is operated outside the U.S.
On modern large aircraft, what electronic device typically monitors flight parameters and performs autopilot functions?
Flight management computer.
What component is the sensing device in an electromechanical autopilot system?
Gyro
(Refer to Figure 16.) Which of the antennas shown is a typical DME antenna?
1
How may the battery replacement date be verified for an emergency locator transmitter (ELT) ?
By observing the battery replacement date marked on the outside of the transmitter.
When must the emergency locator transmitter (ELT) battery be replaced (Other than reading the replacement date)?
When the transmitter has been in use for more than one cumulative hour.
(Refer to Figure 28.) What kind of antenna is this?
An ELT antenna.
When an antenna is installed, it should be fastened
So that loads imposed are transmitted to the aircraft structure.
The preferred location of an ELT is
As far aft as possible but forward of the empennage.
The addition of avionics and associated antenna systems forward of the CG limit will
affect
Empty weight and useful load.
How may the operation of an installed emergency locator transmitter (ELT) be verified during aircraft inspection?
By tuning a communications receiver to the civil emergency frequency and activating the ELT momentarily within five minutes after the hour.
(Refer to Figure 29.) What kind of antenna is this?
A VOR and localizer antenna.
In the landing configuration GPWS typically monitors the radio (radar) altimeter; air data computer; instrument landing system; and
Landing gear and flap positions
When installing a DME antenna, it should be aligned with the
Center line on the airplane.
VHF radio signals are commonly used in
Both VOR navigation and ATC communications.
Static dischargers help eliminate radio interference by dissipating static electricity into the atmosphere at
Low current levels
When would a U.S. resident not be required to hold a Federal Communications Commission (FCC) restricted Radio Telephone Operator permit to operate two-way aircraft VHF radio equipment?
When flying or communicating within the United States.
The preferred location of a VOR antenna on light aircraft is on
Top of the cabin with the apex of the V pointing forward.
(Refer to Figure 22.) What kind of antenna is this?
This is a loop and sense antenna.
What will occur if an aircraft altitude is changed by its autopilot system in order to correct for an error and the involved control surfaces are returned to streamline by the time the aircraft has reached its correct position?
Normal operation.
(Refer to Figure 15.) What is the approximate drag load on an antenna with a frontal area of .125 square feet installed on an aircraft with a speed of 225 MPH?
2.069 pounds
One antenna can be used for the radio range and standard broadcast bands in light aircraft because the
Two ranges are close together.
Installed radio equipment is protected from damage due to jolts and vibration by
Shock mounds
Dutch roll, a combination yawing and rolling oscillation that affects may swept wing aircraft, is concentrated with
A yaw damper system
Part of the ADF system used on aircraft includes
Sense and loop antennas
What is the main purpose of a servo in an autopilot system?
Move the control surface as commanded.
When installing coaxial cable, it should be secured firmly along its entire length
At 2-foot long intervals
(Refer to Figure L6.) Where is the strongest signal for this antenna?
Above the antenna.
The purpose of a glideslope system is to
Assist the pilot in making a correct angle of descent to the runway.
(Refer to Figure 30.) What kind of antenna is this?
A lightning detector system antenna.
(Refer to Figure 24.) What kind of antenna is this?
A lightning detector system antenna.
(Refer to Figure 16.) Which of the antennas shown is a typical glideslope antenna?
2
A gasket or sealant is used between the antenna mast and fuselage skin
To prevent the entry of moisture
In which control element of an autopilot system is an attitude indicator?
Sensing
(Refer to Figure 34.) What kind of antenna is this?
A VOR/ glide slope antenna
(Refer to Figure 32.) What kind of antenna is this?
A radar beacon transponder antenna.
In general, the purpose of an aircraft transponder is to
Receive an interrogation signal from a ground situation and automatically send a reply back.
A fully integrated autopilot controls the aircraft ground how many axes?
Three
Aircraft antenna must be grounded to the
Airframe
Which channel of an autopilot detects changes in pitch attitude of an aircraft?
Elevator
