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and autothrottle flare calculations.
The DEUs use radio altitude data to calculate the type of radio
altitude display and the radio altitude value to show on the
display units.
The weather radar R/T uses radio altitude to turn on or off the
predictive windshear function and to enable/disable display and
alert functions.
The GPWC uses radio altitude in its ground proximity alert and
warning logic calculations.
The FDAU records radio altitude values.
The TCAS computer uses radio altitude to set the sensitivity
levels for intruder advisory calculations and to find if an intruder
aircraft is on the ground.
EFIS Control Panel Interface
The EFIS control panels supply radio minimums values to the
DEUs. The DEUs use radio minimums and radio altitude to
calculate radio minimums alerts that show on the display units.
RA SYSTEM - DATA BUS OUTPUTS, DECISION HEIGHT INTERFACE
EFFECTIVITY
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RA SYSTEM - DATA BUS OUTPUTS, DECISION HEIGHT INTERFACE
EFFECTIVITY
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Purpose
The RA receiver/transmitter calculates radio altitude.
The RA receiver/transmitter has a non-volatile memory which
stores fault information from the last 63 flights. It can store up to
13 faults per flight. Only shop personnel read the non-volatile
memory information.
Description
These are the operation limits of the receiver/transmitter:
* Frequency = 4235 Mhz to 4365 Mhz
* Transmit power = 500 mw nominal
* Operating range = -12 to 2500 feet.
A test connector on the front panel connects test equipment for
shop tests.
Operation
These are the three LED status indicators on the front panel:
* Red or green LRU STATUS LED shows the receiver/
transmitter operational status. It comes on green when the
receiver/transmitter is OK. It comes on red when the
receiver/transmitter has a fault
* Red XMIT ANT FAIL LED shows a transmission antenna or
coax cable fault
* Red REC ANT FAIL LED shows a receive antenna or coax
cable fault.
You push the test switch to start a self-test.
RA SYSTEM - RA RECEIVER/TRANSMITTER
EFFECTIVITY
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RA SYSTEM - RA RECEIVER/TRANSMITTER
EFFECTIVITY
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Purpose
The RA system uses four antennas that transmit and receive RF
signals. Each RA receiver/transmitter has a transmit and
receive antenna. The transmit and receive antennas are the
same and interchangeable.
Physical Description
Four screws attach each antenna to the bottom of the fuselage.
There is an O-ring seal in a groove around the coax connector.
The O-ring seal gives moisture protection. The radiation side of
the antenna has red markings "FWD" and "DO NOT PAINT".
Training Information Point
Do not paint the radiation surface or the back plate of the
antenna. Paint does not permit the antenna to send or receive
RF signals.
RA SYSTEM - RA ANTENNA
EFFECTIVITY
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RA SYSTEM - RA ANTENNA
RA SYSTEM - RA ANTENNA
EFFECTIVITY
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RA SYSTEM - RA ANTENNA
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EFIS Control Panel
The EFIS control panel controls the radio minimums value and
　
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