AF Communication and Navigation Systems

What is the primary purpose of an autopilot?

To relieve the pilot of control of the aircraft during long periods of flight.
To allow for longer fights and more precise courses flown by the pilot.
To stabilize flight control in turbulent conditions.

Which of the following provides manual maneuverability of the aircraft while the autopilot is engaged?

Servo-amplifier.
Directional gyro indicator.
Flight controller.

In an autopilot, which signal nullifies the input signal to the ailerons?

Displacement signal.
Course signal.
Follow-up signal.

In which control element of an autopilot system is an attitude indicator?

Command.
Sensing.
Input.

What is the operating principle of the sensing device used in an autopilot system?

The reaction of the force 90 degrees away from the applied force in the direction of gyro rotation.
The relative motion between a gyro and its supporting ssytem.
The rate of change of motion between the gyro gimbal rings and the aircraft.

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?

Overshoot and oscillation.
Undershoot and oscillation.
Normal operation.

What component of an autopilot system applies torque to the control surfaces of an aircraft?

Servo.
Controller.
Gyro.

What is the main purpose of a servo in an autopilot system?

Correct for displacement of the aircraft about its axis.
Change mechanical energy to electrical energy.
Move the control surface as commanded.

Which channel of an autopilot detects changes in pitch attitude of an aircraft?

Elevator.
Aileron.
Rudder.

The elevator channel of an autopilot controls the aircraft about which axis of rotation?

Roll.
Longitudinal.
Lateral.

What component is the sensing device in an electromechanical autopilot system?

Servo.
Gyro.
Controller.

A fully integrated autopilot controls the aircraft around how many axes?

Two.
Three.
Four.

Dutch roll, a combination yawing and rolling oscillation that affects many sweptwing aircraft, is counteracted with

a flight director system.
an aileron damper system.
a yaw damper system.

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.
whenever the operator desires.
for only a few minutes at a time.

Installed radio equipment is protected from damage due to jolts and vibration by

shock mounts.
spring and/or viscous damper mounted racks.
rubber or foam cushioning material between circuit chassis and case.

Radio equipment is bonded to the aircraft in order to

provide a low-impedance ground.
minimize radio interference from static electrical charges.
provide a low-impedance ground and minimize radio equipment from static electrical charges.

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.
When the aircraft is returned to service.
When the aircraft is certified for IFR flight.

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 to or communicating with destinations out of the United States.
When flying or communicating within the United States.
When the radio equipment is operated in aircraft certified for VFR flight only.

Part of the ADF system used on aircraft includes

RMI indicator antenna.
marker beacon antenna.
sense and loop antennas.

When installing coaxial cable, it should be secured firmly along its entire length

at one-foot intervals.
wherever the cable sags.
at two-foot intervals.

What 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.
Must be replaced annually or if the five-G switch has been activated.
When the transmitter has been tested more than ten times.

An emergency locator transmitter (ELT) battery must be capable of furnishing power for signal transmission for at least

36 hours.
48 hours.
72 hours.

The preferred location of an ELT is

as far forward as possible but aft of the firewall.
at the lowest point possible in the fuelage.
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 a prescribed intensity and duration. It must activate when the force is applied

parallel to the longitudinal axis of the aircraft.
parallel to the vertical axis of the aircraft.
in any direction relative to the aircraft axis.

How may the battery replacement date be verified for an emergency locator transmitter (ELT)?

By removing the batteries and testing them under a measured load to determine if 50 percent of the useful life remains.
By observing the battery replacement date marked on the outside of the transmitter.
By activating the transmitter and measuring the signal strength.

How may the operation of an installed emergency locator transmitter (ELT) be verified during aircraft inspection?

By moving the deactivating switch from the DISARM position to the ARM position while monitoring the civil emergency frequency with a communications receiver at five minutes after the hour.
By activating the five-G switch and turning the unit on at five minutes after the hour.
By tuning a communications receiver to the civil emergency frequency and activating the ELT momentarily within five minutes after the hour.

Static dischargers help eliminate radio interference by dissipating static electricity into the atmosphere at

low current levels.
high voltage level.
high current levels.

Aircraft antennae must be grounded to the

airframe.
wing span.
bus bar.

VHF radio signals are commonly used in

ATC communications.
VOR navigation.
both VOR navigation and ATC communications.

On modern large aircraft, what electronic device typically monitors flight parameters and performs autopilot functions?

Flight management computer.
Transponder.
Control/display unit.

In the landing configuration GPWS typically monitors the radio (radar), altimeter, air data computer, instrument landing system, and

aileron, rudder, and elevator positions.
landing gear and flap positions.
spoiler, slat, and stabilizer positions.

In general, the purpose of an aircraft transponder is to

continually transmit heading, speed, and rate of climb/descent, etc.. information to ATC.
monitor aircraft speed, heading, altitude, and attitude whenever the autopilot system is engaged.
receive an interrogation signal from a ground station and automatically send a reply back.

When an antenna is installed, it should be fastened

to the primary structure at the appropriate intersection of the three aircraft axes.
with a reinforcing doubler on each side of the aircraft skin.
so that loads imposed are transmitted to the aircraft structure.

After an automatic direction finding antenna has been installed, the

antenna must be grounded.
loop must be calibrated.
transmission must be compensated.

Doublers are used when antennas are installed to

eliminate antenna vibration.
prevent oil canning of the skin.
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.
antenna is omnidirectional.
antenna length may be electronically adjusted.

What characteristics of the institution of a rigid antenna on a vertical stabilizer should be evaluated?

Polarization and impedance.
Impedance and interference.
Flutter and vibration.

A gasket or sealant is used between the antenna mast and fuselage skin

to prevent the entry of moisture.
for aircraft pressurization only.
to prevent abrasion between the antenna mast and fuselage skin.

The preferred location of a VOR antenna on light aircraft is on

the bottom of the fuselage and as far forward as possible.
top of the cabin with the apex of the V pointing forward.
top of the vertical stabilizer.

The purpose of a localizer is to

set the airplane on the proper approach angle to the runway.
indicate the distance the airplane is from the end of the runway.
align the airplane with the center of the runway.

Refer to Figure 15. What is the approximate drag load on an airframe with a frontal area of .125 square feet installed on an aircraft with a speed of 225 mph?

2.069 pounds.
2.073 pounds.
2.080 pounds.

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.
3.741 pounds.
3.592 pounds.

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.
not be blanked out by the vertical stabilizer.
facilitate cleaning, inspection, and maintenance.

When bending coaxial cable, the bend radius should be at least

10 times the diameter of the cable.
15 times the diameter of the cable.
20 times the diameter of the cable.

When installing a DME antenna, it should be aligned with the

VOR antenna.
chord line.
centerline on the airplane.

Refer to Figure 16. Which of the antennas shown is a typical DME antenna?

1.
2.
4.

Refer to Figure 16. Which of the antennas shown is a typical glideslope antenna?

2.
3.
4.

Refer to Figure 22. What kind of antenna is this?

This is a glide slope antenna.
This is a DME or a radar beacon transponder.
This is a loop and sense antenna.

Refer to Figure 23. What is this antenna used for?

This is an altitude encoder used with transponders.
This is a TCAS receiver used with monitoring and alterting systems.
This is an aircraft radar beacon transponder used for location identification.

Refer to Figure 24. What kind of antenna is this?

A dipole antenna.
A Marconi antenna.
A loop antenna.

Refer to Figure 25. What type of antenna is this?

A dipole antenna.
A canted antenna.
A Marconi antenna.

Refer to Figure 26. Where is the strongest signal for this antenna?

Below the antenna.
Above the antenna.
Ahead of the antenna.

Refer to Figure 27. What kind of antenna is this?

A glide slope antenna.
A VOR and localizer antenna.
A radar beacon transponder antenna.

Refer to Figure 28. What kind of antenna is this?

An ELT antenna.
A DME antenna.
A VHF communications antenna.

Refer to Figure 29. What kind of antenna is this?

A glide slope antenna.
A VOR and localizer antenna.
A radar beacon transponder antenna.

Refer to Figure 30. What kind of antenna is this?

A lightning detector system antenna
A VOR and localizer antenna.
A satellite weather antenna.

Refer to Figure 31. What kind of antenna is this?

A lightning detector system antenna.
A marker beacon receiver antenna.
A satellite weather antenna.

Refer to Figure 32. What kind of antenna is this?

A lightning detector system antenna.
A marker beacon receiver antenna.
A radar beacon transponder antenna.

Refer to Figure 33. What kind of antenna is this?

A VOR/glide slope antenna.
A marker beacon receiver antenna.
A radar beacon transponder antenna.

Refer to Figure 34. What kind of antenna is this?

A VOR/glide slope antenna.
A marker beacon receiver antenna.
A radar beacon transsponder antenna.

The addition of avionics and associated antenna systems forward of the CG limit will affect

empty weight and useful load.
CG limits and useful load.
useful load and maximum gross weight.

How much clearance from the seat bottom is required when installing radio equipment under a seat?

3 inches with the seat unoccupied.
No set minimum as long as the equipment receives adequate cooling and damage protection.
1 inch with the seat occupied and subjected to maximum downward seat spring deflection.

The purpose of a glideslope system is to

provide for automatic altitude reporting to air traffic control.
indicate the distance the airplane is from the end of the runway.
assist the pilot in making a correct angle of descent to the runway.

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