*
PWS warning discrete.
WES uses the PWS warning discrete to turn on the master warning lights.
EFFECTIVITY
BEJ ALL
WES sends a takeoff configuration arm discrete to PWS. PWS uses this discrete to turn on PWS when the engines get to takeoff thrust.
Traffic Alert and Collision Avoidance System
WXR sends an inhibit discrete to the traffic alert and collision avoidance system (TCAS) computer when there is a PWS alert. This discrete does these functions:
*
Changes resolution advisories (RAs) to traffic advisories (TAs)
*
Inhibits all TCAS audio alerts.
AIMS Cabinets
PWS receives this data from AIMS:
*
Attitude data
*
Air data
*
System test commands.
PWS sends windshear display data to AIMS.
Overhead Panel ARINC 629 System
PWS sends these discretes to the overhead panel ARINC 629 system (OPAS):
*
Windshear caution alert
*
Windshear warning alert
*
PWS fail.
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WXR SYSTEM -PREDICTIVE WINDSHEAR INTERFACES
OPAS changes these discretes to ARINC 629 data and sends the data to AIMS. AIMS makes the visual alert annunciations on the ND and PFD.
Landing Gear Control Lever Module
The landing gear control lever module sends an analog discrete to PWS. PWS uses this discrete in its takeoff/ approach alert logic.
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WXR SYSTEM -PREDICTIVE WINDSHEAR INTERFACES
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WXR SYSTEM -CONTROL AND DISPLAY INTERFACE
Control Inputs
The WXR panel supplies this data to the WXR RTs:
*
Transmit mode
*
Tilt
*
Gain control.
Range data and the on/off discretes go from the EFIS control panel or CDU through the AIMS cabinets to the WXR RTs.
WXR Output Data and Display
The selected WXR RT sends WXR display data to the left and right AIMS cabinets.
Display Relays
The weather radar (WXR) receiver-transmitters (RTs) and the ground proximity warning computer (GPWC) send display data that shows on the navigational displays (NDs). Four terrain select relays control which data shows on each ND.
Relay Power
The terrain select relays gets 28v dc from the TERRAIN DISPLAY circuit breaker on the P11 overhead circuit breaker panel.
EFFECTIVITY BEJ ALL
Relay Interfaces
The WXR RTs connect to the terrain select relays with weather display data buses. The GPWC connects to the terrain select relays with terrain display data buses.
The terrain select relays connect to the AIMS cabinets with data buses. The AIMS cabinets show the data on the NDs.
Relay Control
With weather radar selected, the normal relay position lets weather radar data show on the NDs. When you select TERR on either EFIS control panel (CP), a terrain select ground signal energizes the two on-side terrain select relays. This allows the terrain data to show on the on-side display. Push the TERR switch again and the on-side relays deenergize. The display then shows weather radar data.
Relay Monitor
The GPWC monitors the terrain select relay positions for faults.
Cross Cabinet Bus
The left AIMS cabinet supplies WXR display data to the right AIMS cabinet and the NDs.
The right AIMS cabinet supplies WXR display data to the left AIMS cabinet and the NDs.
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WXR SYSTEM -CONTROL AND DISPLAY INTERFACE
Status Display
The AIMS cabinets get WXR system mode and status data so the NDs can show WXR system mode of operation and system status.
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WXR SYSTEM -CONTROL AND DISPLAY INTERFACE
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WXR SYSTEM -ANTENNA CONTROL INTERFACE
Antenna Tilt
The WXR panel supplies antenna tilt control signals to the WXR RT.
Attitude Sources
The WXR RT uses ADIRS attitude data from AIMS for antenna stabilization.
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