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compartment. Mode 5 arms when this data is true:
* Terrain clearance is less than 1000 feet
* Landing gear is down
* Glideslope signal is valid
* Airplane is not in a backcourse approach
* Localizer signal is captured.
Push the ground proximity Below G/S Switch/Light to inhibit or
cancel mode 5 aural and visual alerts. If you push the switch
before mode 5 alerts begin, you inhibit the aural message and
visual annunciations. If you push the ground proximity
glideslope inhibit switch during a mode 5 alert, you cancel the
aural message and visual annunciations.
When you inhibit or cancel the alert, you can not activate it
again unless the airplane leaves the mode 5 alert conditions or
you cycle the landing gear.
When the GPWC gives an aural message, a discrete goes to the
TCAS computer to inhibit TCAS advisories and aural messages.
GPWS - MODE 5 FUNCTIONAL DESCRIPTION
EFFECTIVITY
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GPWS - MODE 5 FUNCTIONAL DESCRIPTION
GPWS - MODE 5 FUNCTIONAL DESCRIPTION
EFFECTIVITY
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Purpose
The GPWC mode 6 supplies aural callouts when the airplane
descends through set altitudes with the landing gear down.
These are the options available for mode 6:
* Altitude callouts
* Minimums callout
* Approaching minimums callout
* Bank angle (roll alert) callout.
Altitude callouts start at 2500 feet. At 2500 feet, there is an option
to give the aural TWENTY FIVE HUNDRED or give the aural,
RADIO ALTITUDE.
The minimums callout option gives an aural callout when the
airplane descends through the decision height altitude set on
the EFIS control panels. These are the aural callouts the GPWC
can give for decision height:
* MINIMUMS
* MINIMUMS, MINIMUMS
* DECISION HEIGHT.
There is also an approaching minimums option callout that tells
the pilots when the airplane is near the decision height set on
the EFIS control panel. The callout normally comes on when the
airplane altitude is 80 feet above the decision height. The aural
callouts for this option are:
* APPROACHING MINIMUMS
* APPROACHING DECISION HEIGHT
* PLUS HUNDRED (for this callout the altitude selection is set
for decision height + 100 feet).
Mode 6 bank angle callouts occur when the airplane bank angle
is more than 10 degrees between 30 feet and 130 feet altitude.
Above 130 feet, the callout occurs at 35 degrees, 40 degrees,
and 45 degrees. The aural message is BANK ANGLE, BANK
ANGLE.
Description
The GPWC receives inputs from these units:
* Radio altimeter transceivers
* GPWS module
* Program switch module
* left and right ADIRUs
* DEU 1 and 2.
The GPWC uses this data to calculate mode 6 alerts:
* Radio altitude
* Landing gear position
* Program pin selection
* Roll attitude
* Decision height.
Mode 6 is armed when the airplane climbs through 1000 feet
radio altitude. To reset mode 6, the airplane must climb above
the radio altitude where the first altitude callout occurs.
GPWS - MODE 6 DESCRIPTION
EFFECTIVITY
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D633A101-SHZ1 Feb 10/2004
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
34-46-00-020
GPWS - MODE 6 DESCRIPTION
GPWS - MODE 6 DESCRIPTION
EFFECTIVITY
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D633A101-SHZ1 Feb 10/2004
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
34-46-00-020
Purpose
The GPWC gives mode 7 warnings when there are horizontal
and vertical windshear conditions during approach or takeoff.
Description
Windshear is the effect of large volumes of air that change
direction rapidly. The most dangerous type of windshear is the
microburst. When the airplane is near the terrain, a downward
microburst gives the pilots very little time to react to the
windshear effects.
The initial effects on an airplane when it encounters the
microburst are an increase in airspeed and lift. Because of the
increased lift, the airplane increases altitude.
As the airplane continues through the microburst, the effects
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