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31 Cards in this Set
- Front
- Back
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On what two frequencies does the emergency locator transmitter (ELT) operate? |
121.5 and 243.0 megahertz |
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Where is the ELT transmitter normally located on the aircraft? |
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 the ELT batteries be replaced or recharged? |
When the transmitter has been in use for more than one 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? |
By the date marked on the outside of the transmitter. |
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What causes an ELT to actuate? |
Through 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 often must an ELT be inspected for proper installation, battery corrosion, operation of the controls and sensor, and presence of radiated signal? |
Every 12 calendar months. |
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How is an ELT tested to determine that it is working? |
Activate the test switch and listen on the 121.5 or 243.0 megahertz. Make the test during the first 5 minutes of the hour and do not allow the ELT to operate for more than three sweeps. If 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/UHF antenna to the receiver or transmitter? |
Coaxial cable |
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What is a coaxial cable? |
A type of dual-conductor electrical cable in which the center conductor is encased and insulation inside a braided shield that serves as the outer conductor. Coaxial cables are normally used for attaching radio receivers and transmitter antennas |
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How can you determine the proper coaxial cable and connector to use in an aircraft radio installation? |
Refer to the radio installation instructions for the correct part number, cable, and connectors. |
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What precautions should be taken when installing coaxial cables between a radio transmitter and it's antenna? |
The routing should be as direct as possible, and there should be no sharp bends in the coax, and keep away from heat that could soften the insulation. |
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What is a BNC connector? |
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? |
On top of the aircraft along the center line of the fuselage. |
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Which components of the instrument Landing system shares the antenna with the VOR? |
The ILS localizer |
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What is the preferred location for a DME antenna? |
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? |
Vertically polarized whip antenna. |
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What kind of antenna is used for ATC transponder? |
A UHF stub antenna |
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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 practical. |
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What two types of antenna are used with most ADF receivers? |
Directional loop antenna Nondirectional antenna |
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Why is it necessary to install a doubler on the inside of the aircraft skin when an antenna is mounted on the skin? |
To reinforce 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? |
Frees the human pilot from continuously having to fly the aircraft as it flies with high degree of precision with the help of various electronic navigational aid. |
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What are the basic subsystems of an automatic flight control system? |
Command Error-sensing Correction Follow-up |
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What type of device is normally used in the error-sensing subsystem? |
Gyros |
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What are three types of servos that are used in the correction subsystem? |
Hydraulic Pneumatic Electric |
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What is the purpose of the follow-up subsystem in an autopilot? |
Stops 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 mechanic allowed to adjust a communications transmitter? |
No. It needs a license issued by the Federal communications commission (FCC). |
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Which frequency band is used for most aircraft communications? |
The VHF band, 30 to 300 Mhz |
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In which frequency band does the VOR equipment operate? |
VHF band, between 108.0 and 117.95 Mhz |
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In what frequency band does the DME equipment operate? |
UHF band between 962 and 1,024 MHz and between 1,151 and 1,213 megahertz |
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Which frequency band is used for long range communications from an aircraft? |
High frequency band 2 to 25 megahertz. |
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What is meant by a transceiver? |
A radio communication equipment in which all of the circuits for the receiver and the transmitter are contained in one housing. |
