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* GPWM.
GPWS cautions and warnings go to the flight data acquisition
unit (FDAU).
Aural messages go to the remote electronics unit (REU).
GPWS - GENERAL DESCRIPTION
EFFECTIVITY
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EFFECTIVITY
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Flight Compartment Locations
These are the GPWS components in the flight compartment:
* Capt and F/O Below G/S Switch/Light
* Ground proximity warning module.
These are the components in the flight compartment that
interface with the GPWS:
* Capt and F/O display units
* Capt and F/O EFIS control panels
GPWS - FLIGHT COMPARTMENT COMPONENT LOCATION
EFFECTIVITY
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GPWS - FLIGHT COMPARTMENT COMPONENT LOCATION
EFFECTIVITY
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General
The ground proximity warning computer (GPWC) and the GPWS
program switch module are on the electronic equipment
compartment on the E1-1 shelf.
The terrain weather relay 745 is in the J24 box. The J24 box is in
the nose wheel well on the right side and behind the forward
access panel.
The terrain weather relay 746 is in the J22 electrical junction
box. The J22 box is in the nose wheel well on the left side and
behind the forward access panel.
GPWS - COMPONENT LOCATION - 2
EFFECTIVITY
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EFFECTIVITY
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General
The ground proximity warning computer (GPWC) receives 115v
ac from the GND PROX WARN circuit breaker on the P18 circuit
breaker panel.
The terrain weather relays receive 28v dc from the TERRAIN
DISPLAY circuit breaker on the P18 circuit breaker panel.
The GPWC provides a ground discrete (terrain select) to
energize the terrain weather relays. This discrete energizes the
TERR/WXR relays to connect the GPWC to the DEUs so that
terrain data shows on the navigation displays.
The terrain select discrete can be set manually with the TERR
switch on the EFIS control panel or automatically by the pop up
function. The pop up function lets terrain data show
automatically on the navigation displays when there is a
terrain awareness caution or warning. This function only occurs
when both of the navigation displays are not currently showing
terrain data.
When the terrain weather relays energize, they send 28v dc to
the GPWC relay monitors to show relay position.
Gear position from the landing gear lever switch module on P2-
3 goes to the gear inhibit switch in the ground proximity warning
module (GPWM). The GPWM sends the landing gear position
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