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GPWS - EFIS CONTROL PANEL
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General
The ground proximity warning module (GPWM) is the interface
between the flightcrew and the GPWS. The GPWM has an
amber GPWS INOP light. The panel also has these switches:
* Test switch
* Flap inhibit switch
* Gear inhibit switch.
* Terrain inhibit switch.
INOP light
The amber INOP light on the GPWM comes on when there is a
failure of the GPWC or if there is a failure of a critical input to the
GPWC. The INOP light also comes on if the GPWC can not
calculate windshear conditions. During a GPWC self test, the
INOP light comes on.
Test Switch
The test switch is a momentary action switch that lets you do a
self-test of the GPWC from the flight compartment.
Momentarily push the test switch to start a self-test. There are
six levels of self-tests that can be done from the GPWM. To
make navigation of self-test levels faster, the test switch can be
used to cancel self-test sequences and self-test levels. A short
cancel stops a test sequence and a long cancel stops a self-test
level. Push the test switch for less than two seconds for a short
cancel and push the test switch for more than two seconds for a
long cancel.
Inhibit Switches
The flap, gear, and terrain inhibit switches supply discrete
signals to the GPWC.
The flap inhibit switch simulates a flaps down condition to the
GPWC. The use of this switch prevents warnings when the flight
crew makes a flaps up approach. When selected, the mode 4
warning TOO LOW FLAP is inhibited.
The gear inhibit switch simulates a gear down condition to the
GPWC. The use of this switch p[revents warnings when the
flight crew makes a gear up approach. When selected, the
mode 4 warning TOO LOW GEAR is inhibited.
GPWS - GROUND PROXIMITY WARNING MODULE
EFFECTIVITY
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The terrain inhibit switch sends a discrete ground to the GPWC.
The discrete ground inhibits the terrain clearance floor (TCF)
function and the terrain awareness (TA) function. When the
switch is in the inhibit position, TCF and TA cautions and
warnings do not show on the navigation displays and are not
heard over the flight deck speakers. Also, when the terrain
inhibit switch is in the inhibit position, the amber TERR INHIBIT
message shows on both navigation displays.
GPWS - GROUND PROXIMITY WARNING MODULE
EFFECTIVITY
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GPWS - GROUND PROXIMITY WARNING MODULE
GPWS - GROUND PROXIMITY WARNING MODULE
EFFECTIVITY
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Purpose
Mode 1 supplies alerts and warnings for large descent rates
when the airplane is near the terrain. This mode is independent
of flap or gear positions.
Description
The alert condition gives the aural message, SINK RATE and
makes the PULL UP display on the attitude indication (AI). If the
descent rate does not decrease, the alert condition changes to a
warning condition.
The warning condition makes the red PULL UP warning on the
AI and gives the aural message, WHOOP WHOOP PULL UP.
GPWS - MODE 1 DESCRIPTION
EFFECTIVITY
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GPWS - MODE 1 DESCRIPTION
GPWS - MODE 1 DESCRIPTION
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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General
Mode 1 alert conditions and warning conditions can occur
　
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