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MK VI MK VIII EGPWS Installation Design Guide
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SHEET 299
6.6.9 +28V ILS Tuned Discrete #1
Type: Supplied by ILS/VOR Mode Selector.
Signal Status: ILS tuned or VOR tuned
Level 6 Audio readout
+28 V ILS Tuned Discrete #1
ILS Tuned =>
ILS Not Tuned =>
“28 Volts ILS 1 Tuned”
“28 Volts ILS 1 Not Tuned”
6.6.10 Glideslope Validity Discrete #1
A Glideslope Validity Discrete may be used by EGPWS, for the ARINC 547 Glideslope Receiver input.
Type: Validity from ARINC 547 Glideslope receiver.
Signal Status: Valid or Invalid
Note: Analog Glideslope monitoring requires that this input discrete (or the Analog Low Level Glideslope Validity
Discrete) is always true whenever ILS is not tuned . In other words that the flag is biased out of view.
Level 6 Audio readout
Glideslope Validity Discrete #1
Valid =>
Invalid =>
“Glideslope 1 Valid”
“Glideslope 1 Invalid”
6.6.11 GND Glideslope Inhibit Discrete
Type: Switch for inhibit of Glideslope mode
Signal Status: Glideslope Inhibit or Not Inhibit
Mode 5 will be disabled and “Glideslope” will not be enunciated during cockpit Self Test and the long vocabulary test if
inhibited.
Level 6 Audio readout
Glideslope Inhibit Discrete
Inhibit =>
Not Inhibit =>
“Glideslope Inhibit True”
“Glideslope Inhibit False”
6.6.12 +28 V Glideslope Inhibit Discrete
Type: Supplied by an alternate action latching cockpit switch for inhibit of Glideslope mode.
Signal Status: Glideslope Inhibit or Not Inhibit
Mode 5 will be inhibited and “Glideslope” will not be enunciated during cockpit Self Test and the long vocabulary test if
inhibited.
Level 6 Audio readout
+28V Glideslope Inhibit Discrete
Inhibit =>
Not Inhibit =>
“28 Volts Glideslope Inhibit True”
“28 Volts Glideslope Inhibit False”
6.6.13 Glideslope Cancel Discrete
Type: Supplied by a momentary actuated cockpit Glideslope mode manual inhibit switch.
Signal Status: Glideslope is canceled if Glideslope function is active
Fault monitoring: Activation of this input for more than 15 seconds will result in the ‘Glideslope Cancel Invalid’ fault
which will cause a GPW INOP indication. Typically the Glideslope cancel can only be selected below
2000 feet AGL.
Level 6 Audio readout
Glideslope Cancel Discrete
Cancel =>
Normal =>
“Glideslope Canceled”
“Glideslope Enabled”