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22 Cards in this Set
- Front
- Back
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Is a certificated mechanic allowed to adjust the communications transmitter? |
No, an FCC license is required |
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Which frequency band is used for most aircraft communications? |
VHF 30 to 300 MHz |
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In what frequency band does the VOR equipment operate? |
VHF 108.0 and 117.95 MHz |
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What is the preferred location for a VOR antenna on an airplane? |
On the 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? |
ILS Localizer |
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In what frequency band does the DME equipment operate? |
UHF band between 960 and 1215 MHz also known as lower L-band |
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What is the preferred location for a DME antenna? |
On the belly of the aircraft along the center line as far from any other antenna as practical |
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On what frequency is the marker beacon signal transmitted? |
75 MHz |
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What do the three marker beacon lights indicate to the pilot? |
Blue indicates passage over the outer marker, Amber indicates passage over the middle marker, White indicates passage over any other location specified on instrument approach
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What precautions should be observed when working around aircraft radar? |
They should never be operated within 100 yards of people and buildings because pulses of electrical energy transmitted from the radar antenna are strong enough to seriously injure a person struck by them, and can also destroy the receiver circuitry when reflected by nearby buildings. Not to be operated when an aircraft is being fueled |
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Which frequency band is used for long range communication from an aircraft? |
High frequency band 2 to 25 MHz |
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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. |
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On what 2 frequencies does an emergency locator transmitter operate? |
121,5 and 243.0 MHz |
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Where is the ELT transmitter normally located on the aircraft? |
As far aft as possible so it is least likely to be damaged in a crash |
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What three components of an instrument landing system are installed in an aircraft? |
Receivers for the localizers, the glide slope, and the marker beacons |
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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 the ATC transponder? |
UHF stub antenna |
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What is the preferred location for the ATC transponder antenna? |
On the centerline of the belly of the aircraft far from any other antenna as practical |
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What kind of conductor is used to connect the VHF or UHF antenna to its receiver or transmitter? |
Coaxial cable |
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What two types of antenna are used with most ADF receivers? |
Directional loop antenna and non-directional sense antenna |
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Why is it important that all shock-mounted electronic equipment be connected to the aircraft structure with a bonding braid? |
The bonding braid carries the return current into the aircraft structure |
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Why is it necessary to install a doubler on the inside of an aircraft skin when the 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 |
