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first officer primary flight display and the navigation display.
The GPWC sends caution, warning, and status discretes to the
flight data acquisition unit (FDAU). The FDAU sends the GPWC
data to the flight data recorder.
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The GPWC sends terrain display data on an ARINC 453 data bus
to the terrain weather relays. The display data then goes from
the terrain weather relays to the DEUs to show on the
navigation displays.
The terrain data is sent when TERR is selected on the EFIS
control panel or automatically for the pop-up mode. The pop-up
mode occurs when a terrain caution or warning is calculated
and the captain and the first officer navigation displays are not
selected to show terrain data.
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Purpose
The ground proximity warning computer (GPWC) and the
weather radar (WXR) receiver-transmitter send display data
that shows on the navigational displays (NDs). Two terrain
weather select relays control which data shows on each ND.
Relay Power
The terrain weather select relays get 28v dc from the terrain
display circuit breaker on the P18 circuit breaker panel.
Digital Relay Interfaces
The GPWC and WXR send data to both terrain weather select
relays on ARINC 453 data buses.
The terrain weather select relays send data to the display
electronics units on ARINC 453 data buses. The display
electronics units shows the data on the NDs.
Relay Control
When you push the WXR switch on the EFIS control panel, the
normal relay position lets the weather radar data show on the
NDs. When you push the TERR switch on either EFIS control
panel (CP), the on side DEU sends a discrete to the GPWC.
When the GPWC receives the DEU discrete, it sends a terrain
select ground discrete signal to energize the relay. This lets the
terrain data connect to the DEUs for display on the NDs. When
you push the TERR switch again, the relay deenergizes. The
relay now connects the WXR to the DEUs.
Relay Monitor
The terrain weather select relays send a signal to the GPWC
when it energizes. The GPWC uses these inputs to identify
which position the relays are in. When the relays are in the
normal position, the GPWC monitor senses no voltage. When
the relays are in the energized position, the GPWC monitor
senses 28v dc.
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Purpose
The ground proximity warning computer (GPWC) compares the
airplanes flight profile, flap and gear position, and terrain
clearance to find if there is a warning condition.
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