3.8.36 TACTICAL SELECT DISCRETE
Tactical Select discrete may be used by EGPWS for an indication that the Tactical Select switch has been pressed. Type: momentary make/break switch Signal Status: Tactical Select Selected or Not Selected
Level 6 Audio readout
Selected => “Tactical Selected”
Tactical Select Discrete
Not Selected => “Tactical Not Selected”
3.8.37 ALTITUDE ALERT DISCRETE
Altitude Alert discrete may be used by EGPWS for an indication that the Altitude Alert is selected.
Type: Discrete for activating the Altitude Alert tone.
Signal Status: Altitude Alert Selected or Deselected
Level 6 Audio readout
True => “Altitude Alert Selected”
Altitude Alert Discrete
False => “Altitude Alert Deselected”
3.8.38 CORRECTED BAROMETRIC ALTITUDE VALIDITY DISCRETE
Corrected Barometric Altitude Validity Discrete may be used by EGPWS to determine when the Corrected Altitude input is invalid. Type: Validity from Corrected Barometric Altitude computer. Signal Status: Valid or Invalid Level 6 Audio readout
Valid => “Corrected Altitude Valid”
Corrected Barometric Alt Valid
Invalid => “Corrected Altitude Invalid”
3.8.39 MOMENTARY FLAP OVERRIDE DISCRETE
Flap Override Discrete may be used by EGPWS to determine when Flap Override has been selected.
Type: Momentary make/break switch.
Signal Status: Selected or Not Selected
Level 6 Audio readout Selected => “Flap Override”
Momentary Flap Override Discrete Not Selected => “Not Flap Override”
3.8.40 WEIGHT ON WHEELS DISCRETE
Weight On Wheels Discrete may be used by EGPWS to determine if the aircraft is on the ground. Type: Weight On Wheels Status Signal Status: On Ground or Not On Ground
Level 6 Audio readout
Selected => “On Ground”
Weight On Wheels Discrete
Not Selected => “Not On Ground”
3.8.41 GPWS INHIBIT DISCRETE
This discrete inhibits all audio and visual except for Windshear, Terrain Awareness and TCF. Type: Analog discrete input from a flight deck mounted switch Signal Status: GPWS enabled or disabled Fault monitoring: Activation of this input for more than 5 seconds will result in the ‘GPWS Inhibit’ fault which will
cause a GPW INOP indication. The functionality of this input is not affected by the 'EGPWS Suppress' configuration
data item activated via the selected Category 5 ID (refer to section 5.2.5)
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