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12 Communication and

QuestionAnswer
(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.
After an automatic direction finding antenna has been installed, the loop must be calibrated.
The purpose of a glideslope system is to assist the pilot in making a correct angle of descent to the runway.
An emergency locator transmitter (ELT) battery must be capable of furnishing power for signal transmission for at least 48 hours.
(Refer to Figure 29.) What kind of antenna is this? A VOR and localizer antenna.
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.
Radio equipment is bonded to the aircraft in order to provide a low-impedance ground and minimize radio interference from static electrical charges.
One antenna can be used for the radio range and standard broadcast bands in light aircraft because the two ranges are close together.
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.
On modern large aircraft, what electronic device typically monitors flight parameters and performs autopilot functions? Flight management computer.
What component of an autopilot system applies torque to the control surfaces of an aircraft? Servo.
The elevator channel of an autopilot controls the aircraft about which axis of rotation? Lateral.
In an autopilot, which signal nullifies the input signal to the ailerons? Follow-up signal.
What component is the sensing device in an electromechanical autopilot system? Gyro.
When installing a DME antenna, it should be aligned with the centerline on the airplane.
An emergency locator transmitter (ELT) is normally activated by an inertial switch or equivalent mechanism if subjected to a force of a prescribed intensity and duration. It must activate when the force is applied parallel to the longitudinal axis of the aircraft.
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.
Dutch roll, a combination yawing and rolling oscillation that affects many sweptwing aircraft, is counteracted with a yaw damper system.
(Refer to Figure 26.) Where is the strongest signal for this antenna? Above the antenna.
(Refer to Figure 16.) Which of the antennas shown is a typical glideslope antenna? 2
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.
Installed radio equipment is protected from damage due to jolts and vibration by shock mounts.
Aircraft antenna must be grounded to the airframe
(Refer to Figure 16.) Which of the antennas shown is a typical DME antenna? 1
(Refer to Figure 23.) What is this antenna used for? This is an altitude encoder used with transponders.
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.
(Refer to Figure 24.) What kind of antenna is this? A dipole antenna.
Which of the following provides manual maneuverability of the aircraft while the autopilot is engaged? Flight controller.
(Refer to Figure 31.) What kind of antenna is this? A marker beacon receiver antenna.
What is the main purpose of a servo in an autopilot system? Move the control surface as commanded.
When must the radio station license be displayed in an aircraft equipped with a two-way radio? When the aircraft is operated outside the United States.
A fully integrated autopilot controls the aircraft around how many axes? Three.
(Refer to Figure 32.) What kind of antenna is this? A radar beacon transponder antenna.
(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.
Doublers are used when antennas are installed to reinstate the structural strength of the aircraft skin.
When operationally checking an autopilot system on the ground, after the aircraft's main power has been switched on, the autopilot should be engaged only after the gyros come up to speed and the amplifier warms up.
The preferred location of a VOR antenna on light aircraft is on top of the cabin with the apex of the V pointing forward.
What is the primary purpose of an autopilot? To relieve the pilot of control of the aircraft during long periods of flight.
What is the operating principle of the sensing device used in an autopilot system? The relative motion between a gyro and its supporting system.
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.
The addition of avionics and associated antenna systems forward of the CG limit will affect empty weight and useful load.
(Refer to Figure 33.) What kind of antenna is this? A VOR/glide slope antenna.
Part of the ADF system used on aircraft includes sense and loop antennas.
Static dischargers help eliminate radio interference by dissipating static electricity into the atmosphere at low current levels.
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 34.) What kind of antenna is this? A VOR/glide slope antenna.
(Refer to Figure 28.) What kind of antenna is this? An ELT antenna.
The purpose of a localizer is to align the airplane with the center of the runway.
A gasket or sealant is used between the antenna mast and fuselage skin to prevent the entry of moisture.
When an antenna is installed, it should be fastened so that loads imposed are transmitted to the aircraft structure.
What will occur if an aircraft attitude 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.
When installing coaxial cable, it should be secured firmly along its entire length at two-foot intervals.
What characteristics of the installation of a rigid antenna on a vertical stabilizer should be evaluated? Flutter and vibration.
The preferred location of an ELT is as far aft as possible but forward of the empennage.
In which control element of an autopilot system is an attitude indicator? Sensing.
VHF radio signals are commonly used in both VOR navigation and ATC communications.
(Refer to Figure 22.) What kind of antenna is this? This is a loop and sense antenna.
(Refer to Figure 30.) What kind of antenna is this? A lightning detector system antenna.
(Refer to Figure 25.) What kind of antenna is this? A canted antenna.
When bending coaxial cable, the bend radius should be at least 10 times the diameter of the cable.
Which channel of an autopilot detects changes in pitch attitude of an aircraft? Elevator.
(Refer to Figure 27.) What kind of antenna is this? A radar beacon transponder antenna.
Created by: Jack Mollohan
 

 



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