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* Auto throttle switch packs
* Radio altimeters.
The PWS CPU controls the antenna scan and pulse repetition
frequency of the transmitter to detect windshear events directly
in front of the airplane. The area is limited to a very small range
because of the high pulse repetition frequency.
When the PWS CPU detects a windshear, it sends the warning
or caution to the GPWS. The GPWS has the priority logic for
warnings and cautions. If there is no higher priority warning or
caution, the PWS CPU sends the windshear display to the DEUs
and sends the aural signal to the REU. Also, the PWS CPU
sends an aural inhibit to the TCAS computer to inhibit any aural
signals from TCAS.
Oscillator/Transmitter Circuits
The oscillator/transmitter circuit makes RF pulse patterns and
sends them out through the WXR antenna.
RF Transmit
The RF pulses go from the transmitter circuits through the
circulator. The circulator connects the antenna to the
transmitter during RF transmission. It also connects the
antenna to the receiver circuits to get the return RF pulses.
From the circulator, the RF goes to the WXR antenna.
WXR SYSTEM - WXR R/T FUNCTIONAL DESCRIPTION
EFFECTIVITY
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RF Receive
The antenna receives the RF return signals. Then the RF goes
through the circulator to the receiver circuits. The receiver
circuits process the return signals and send them to the CPU.
The CPU uses the strength of the RF return signals to calculate
the intensity of the precipitation and to make the WXR display
data.
When the PWS is on, the return signals may also contain
windshear information. The PWS CPU processes the windshear
returns and makes the aural signals and display signals.
WXR Display Data
The CPU puts this data into the ARINC 453 format:
* WXR display data
* Range processed
* System mode
* Status data.
The CPU sends the output data to the ARINC 453 transmitters.
The 453 transmitters send the data on the high speed ARINC
453 DATA BUS 1 and DATA BUS 2 to the DEUs.
System Status Data
The BITE module continuously gets system status data. The
system status and the faults show on the ND alert lines.
WXR SYSTEM - WXR R/T FUNCTIONAL DESCRIPTION
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
34-43-00-017
WXR SYSTEM - WXR R/T FUNCTIONAL DESCRIPTION
WXR SYSTEM - WXR R/T FUNCTIONAL DESCRIPTION
EFFECTIVITY
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Page 57
D633A101-SHZ1 Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
34-43-00-017
Antenna Control
The CPU in the WXR R/T controls and monitors the antenna
operation.
Antenna Stabilization
The WXR R/T uses attitude inputs from the ADIRU for antenna
stabilization. The CPU uses the attitude inputs to calculate and
control the scan and elevation movements. It sends the scan
and elevation drive signals to the antenna.
Antenna Operation
The antenna power supply gets 115v ac from the WXR R/T. The
antenna power supply sends 26v dc power to the antenna motor
driver. The motor driver sends 26v dc power to the scan and
elevation stepper motors. The motor driver also sends power to
the antenna position monitors.
Antenna Drive
The antenna has one scan motor and one elevation motor.The
scan motor drives a geartrain which moves the antenna
horizontally. It moves the antenna |90 degrees from the
centerline of the airplane. The elevation motor drives a gear
train which moves the antenna vertically. It moves the antenna
up and down |40 degrees. This elevation range includes |15
degrees for the manual tilt.
Antenna Position Feedback
There are two zero and two incremental monitors in the
antenna assembly. Each stepper motor has one zero monitor
and one incremental monitor. The zero monitors read the zero
or center position of the stepper motor. The incremental
monitors count the number of steps the motor moves from the
center position. The monitors send antenna position data to the
WXR R/T.
Antenna Position Compare
The WXR R/T CPU uses the position information from the
monitors to compare the actual antenna position with the
desired antenna position. When the two are not the same, the
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