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31 Cards in this Set
- Front
- Back
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On what two frequencies does the Emergency Locator Transmitter operate? |
121.5 and 243.0 megahertz.
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Where is the ELT transmitter normally located on an aircraft?
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In the tail of the aircraft or as far aft as possible, so it will be least likely to be damaged in a crash.
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How often should ELT batteries be replaced or recharged?
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When the transmitter has been in use for more than 1 cumulative hour, or when 50% of their useful life or charge has expired.
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How can you know when an ELT battery must be replaced or recharged?
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By the date marked on the outside of the transmitter.
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How often must ELTs be inspected for proper installation, battery corrosion, operation of the controls and sensor, and the presence of the radiated signal?
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Every 12 calendar months.
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What causes an ELT to actuate?
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An inertia switch that detects an impact parallel to the longitudinal axis of the aircraft as would occur in a crash.
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How is an ELT tested to determine that it is working?
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Actuate the test switch and listen on 121.5 or 243.0 MHz. Make the test during the first five minutes of the hour and do not allow the ELT to operate for more than 3 sweeps. If the ELT is operated outside of this time frame, you should contact the control tower before conducting the test.
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What kind of conductor is used to connect a VHF or UHF antenna to the receiver or transmitter?
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Coaxial cable.
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What is a coaxial cable?
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A type of two–conductor electrical cable in which the center conductor is encased in insulation inside a braided shield that serves as the outer conductor. Coaxial cables are normally used for attaching radio receivers and transmitters to antennas.
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How can you determine the proper coaxial cable and connectors to use in an aircraft radio installation?
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Refer to the radio installation instructions for the correct part number for the cable and connectors.
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What precautions should be taken when installing coaxial cable between a radio transmitter and its antenna?
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The routing should be as direct as possible, there should be no sharp bends in the coax, and it should be kept away from heat that could soften the insulation.
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What is a BNC connector?
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A coaxial cable connector that is connected by inserting the guide pins on the male connector into slots in the female connector and twisting the connector one quarter turn.
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What is the preferred location for a VOR antenna on an airplane?
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On top of the aircraft, along the center line of the fuselage.
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Which component of the Instrument Landing System shares the antenna with the VOR?
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The ILS localizer.
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What is the preferred location for a DME antenna?
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Along the center line of the belly of the aircraft, as far from any other antenna as is practical.
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What kind of antenna is used for VHF communications?
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A vertically polarized whip antenna.
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What kind of antenna is used for the ATC transponder?
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A UHF stub antenna.
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What is the preferred location for the ATC transponder antenna?
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On the center line of the belly of the aircraft as far from any other antenna as is practical.
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What two types of antenna are used with most ADF receivers?
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A directional loop antenna and a nondirectional sense antenna.
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Why is it necessary to install a doubler on the inside of the aircraft skin when antenna is mounted on the skin?
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The doubler reinforces the skin so wind loads on the antenna will not cause the skin to flex and crack.
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What is the basic purpose of an autopilot?
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It frees the human pilot from continuously having to fly the aircraft, and flies with a high degree of precision. It also couples with various electronic navigational aids.
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What are the basic subsystems of an automatic flight control system?
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Command, error–sensing, correction, and follow–up.
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What type of device is normally used in the error–sensing subsystem?
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Gyros.
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What are three types of servos that are used in the correction subsystem?
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Hydraulic, pneumatic, and electric.
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What is the purpose of the follow–up subsystem in an autopilot?
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It stops the control movement when the surface has deflected the proper amount for the signal sent by the error sensor.
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Is a certificated airframe mechanic allowed to adjust a communications transmitter?
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No, this requires a license issued by the Federal Communications Commission.
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Which frequency band is used for most aircraft communications?
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The VHF band, between 30 and 300 megahertz.
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In which frequency band does the VOR equipment operate?
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In the VHF band, between 108.0 and 117.95 megahertz.
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In what frequency band does the DME equipment operate?
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In the UHF band, between 962 and 1,024 megahertz, and between 1,151 and 1,213 megahertz.
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Which frequency band is used for long–range communications from an aircraft?
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The high frequency band (2 to 25 megahertz).
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What is meant by a transceiver?
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It is a piece of radio communications equipment in which all of the circuits for the receiver and the transmitter are contained in one housing. |
