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* fwd - forward
* gnd - ground
* GS - ground speed
* hPa - hectopascals
WEATHER RADAR SYSTEM - INTRODUCTION
EFFECTIVITY
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* in - inch
* intlk - interlock
* IRS - inertial reference system
* kg - kilograms
* L - left
* LED - light emitting diode
* lb - pounds
* mag - magnetic
* max - maximum
* MDA - minimum descent altitude
* MHz - megahertz
* MINS - minimums
* MTRS - meters
* nav - navigation
* NCD - no computed data
* ND - navigation display
* NM - nautical miles
* OK - good or pass
* PFD - primary flight display
* pos - position
* PRF - pulse repetition frequency
* PWS - predictive windshear
* R - right
* rad - radio
* RF - radio frequency
* R/T - receiver/transmitter
* sta - station
* stab - stabilization
* stb - stabilization
* std - standard
* TAS - true air speed
* TCAS - traffic alert and collision avoidance
* trk - track
* TRU - true
* V - volts
* VOR - very high frequency omnidirectional range
* wpt - waypoint
* WX - weather
* WX/TURB - weather/turbulence
* WX+TURB - weather+turbulence
* WXR - weather radar
* Z - zulu (universal coordinated time)
WEATHER RADAR SYSTEM - INTRODUCTION
EFFECTIVITY
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WEATHER RADAR SYSTEM - INTRODUCTION
WEATHER RADAR SYSTEM - INTRODUCTION
EFFECTIVITY
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Control
These components supply weather radar (WXR) system control:
* Left and right EFIS control panels
* Weather radar control panel.
System Inputs
These components supply signals to the WXR transceiver for
predictive windshear:
* Air data inertial reference system sends air data for the PWS
function
* Radio altimeters send altitude to enable or disable PWS
during takeoff and approach
* Autothrottle switch packs enable PWS during takeoff
* Landing gear lever switch sends a landing gear down
discrete to enable PWS during approach
* An air/ground relay sends an air/ground discrete for flight
leg counting.
System Outputs
The weather radar transceiver sends these signals out for
predictive windshear:
* PWS video to the WXR/TERR relays
* PWS warnings or cautions to the GPWS to prioritize any
callouts
* Audio inhibit to TCAS when there is a PWS warning
* Audio to the REU for PWS.
Display
WXR data shows on the navigation displays (NDs). The weather
data from the WXR receiver/transmitter (R/T) goes to the
weather radar/terrain (WXR/TERR) relays.
The ground proximity warning computer (GPWC) controls and
switches the relays. If TERR is selected on the EFIS control
panel or there is a Terrain Awareness/Terrain Clearance Floor
warning from the GPWC, then the EGPWS terrain data shows on
the navigation display (ND). If TERR is not selected and there
are no EGPWS warnings, WXR data shows on the ND.
Antenna
The WXR antenna sends the RF pulses and receives the RF
returns. The R/T gets air data inertial reference unit (ADIRU)
pitch and roll data for antenna stabilization.
Receiver/Transmitter (R/T)
The primary component of the WXR system is the weather radar
R/T. The WXR R/T does these functions:
* Transmits RF pulses
* Processes the RF returns
* Detects windshear events and sends warnings and cautions
to the flight crew
* Supplies the WXR display data.
WXR SYSTEM - GENERAL DESCRIPTION
EFFECTIVITY
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WXR SYSTEM - GENERAL DESCRIPTION
WXR SYSTEM - GENERAL DESCRIPTION
EFFECTIVITY
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34-43-00-002
WXR SYSTEM - GENERAL DESCRIPTION
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