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OP avionics

QuestionAnswer
What are the basic components of a radio communication system? Microphone, Speakers, transmitter, receiver, transmitter/receiver antenna.
What frequency range is used by most modern voice communication systems? VHF very high frequency band 118-136.975 mhz.
What does the term ADF stand for? Airbourne direction finding (finder).
What is the function of the VOR equipment? Navigation.
Name the components of a typical airborne navigation system? Receiver, antennas, frequency selector, visual display indicator.
What does DME stand for? Distance Measuring Equipment.
At what interval must an ATC transponder system be certified? Every 24 calendar months.
Whay are two antennas usually required for an ILS system? The localizer and glide scope are transmitted on different frequencies.
What information does the glide slope beam provide? Vertical guidance for aircraft to maintain the correct descent angle.
What is the power source for the ELT? An internal battery?
Describe one method of monitoring the signal output during the ELT test. Tune a communication receiver to 121.5 MHz.
How would you tell if the batteries in an ELT are due for recharge or replacement? By looking for a recharge or replacement date on the unit or checking the aircraft log book.
At what time is a test of an installed ELT permitted? During the first 5 minutes after the hour and for no more than 3 sweeps.
Where on the aircraft would you expect to find a DME antenna? On the bottom of the fuselage in a place where the wings will not block the signal during turns.
Describe the shape and location of a transponder antenna? Either a short blade or wire with a ball located on the bottom of the fuselage.
Name the basic components of an autopilot system? Gyros, Servos, Controller, amplifier or computer.
What are the sensing elements of an autopilot system? Attitude, directional, turning gyros and altitude sensor.
What is the function of the servos in an autopilot system? The servos actuate the flight controls.
What is the purpose of a bonding jumper from a radio shock mount to the airframe? To provide a low impedance ground return.
Describe the procedure used to route coaxial cable from an antenna in a receiver? Supported every 2 feet, bends should be 10 times the cable diameter and routed separately from other wires.
Is a certificated airframe mechanic allowed to adjust a communications transmitter? No, this requires a license issued by the Federal Communications Commission.
In which frequency band does the VOR equipment operate? In the VHF band, between 108.0 and 117.95 megahertz.
What is the preferred location for a VOR antenna on an airplane? On top of the aircraft on the center line of the aircraft.
Which component of the Instrument Landing System shares the antenna with the VOR? The ILS localizer.
In what frequency band does the DME equipment operate? In the UHF band, between 962 and 1,024 megahertz and between 1,151 and 1,213 megahertz
On what frequency is the marker beacon signal transmitted? 75 megahertz.
What do the three marker beacon lights indicate to the pilot? The blue light indicates the outer beacon the amber light indicates the middle beacon and the whit light indicates any other location specified on the approach.
What precautions should be observed when working around aircraft radar? aircraft radar should never be operated when there are people or buildings within 100 yards of the antenna sweep, and it must not be operated when the aircraft is being fueled or defueled.
What is meant by a transceiver? A piece of radio communications equipment in which all of the circuits for the receiver and the transmitter are contained in one housing.
What three components of an instrument landing system are installed on an aircraft? The receivers for the localizer, glideslope and marker beacons.
What kind of antenna is used for VHF communications? A vertically polarized whip antenna.
What kind of antenna is used for the ATC trans­ponder? A UHF stub antenna.
What is the preferred location for the ATC transponder antenna? On the center line of the belly of the aircraft as far from any other antenna as is practical.
What kind of conductor is used to connect a VHF or UHF antenna to its receiver or transmitter? Coaxial cable.
What two types of antenna are used with most ADF receivers? A directional loop antenna and a nondirectional sense antenna.
Why is it necessary to install a doubler on the inside of the aircraft skin when antenna is mounted on the skin? The doubler reinforces the skin so wind loads on the antenna will not cause the skin to flex and crack.
Created by: g153511
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