Display select discrete #2, Terrain awareness & tcf inhibit discrete, Autopilot engaged discrete #1 – Honeywell MK VI User Manual
Page 301: Barometric altitude validity discrete, Magnetic heading validity discrete, Attitude validity discrete
Honeywell
MK VI MK VIII EGPWS Installation Design Guide
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6.6.19 Display Select Discrete #2
Type: Supplied by momentarily actuated cockpit manual switch.
Signal Status:
Terrain Awareness Display (TAD) activated if not active or TAD canceled if currently active.
Level 6 Audio readout
Display Select Discrete #2
True =>
False =>
“Display Discrete 2 True”
“Display Discrete 2 False”
6.6.20 Terrain Awareness & TCF Inhibit Discrete
Type: Supplied by an alternate action (latching) and self indicating cockpit switch for inhibit of Terrain Awareness &
TCF functions
Signal Status:
Terrain Awareness & TCF Inhibit or Not Inhibit
“Terrain Inhibited” will be enunciated during cockpit Self Test if inhibited.
Level 6 Audio readout
Terrain Awareness & TCF Inhibit
Inhibit =>
Not Inhibit =>
“Terrain Off”
“Terrain On”
6.6.21 Autopilot Engaged Discrete #1
An Autopilot Engaged Discrete may be used by EGPWS for the Bank Angle mode computation.
Type: Discrete from the Autopilot system.
Signal Status:
Engaged or Not Engaged
Level 6 Audio readout
Autopilot Engaged Discrete
Engaged =>
Not Engaged =>
“Autopilot On”
“Autopilot Off”
6.6.22 Barometric Altitude Validity Discrete
A Barometric Altitude Validity Discretes may be used by EGPWS for the barometric rate sensor.
Type: Validity from barometric altitude sensor.
Signal Status:
Valid or Invalid
Level 6 Audio readout
Barometric Altitude Validity Discrete
Valid =>
Invalid =>
“Altitude Valid”
“Altitude Invalid”
6.6.23 Magnetic Heading Validity Discrete
A Magnetic Heading Validity Discrete may be used by EGPWS for the Mag Heading sensor.
Type: Validity from Magnetic Heading sensor.
Signal Status:
Valid or Invalid
Level 6 Audio readout
Magnetic Heading Validity Discrete
Valid =>
Invalid =>
“Magnetic Heading Valid”
“Magnetic Heading Invalid”
6.6.24 Attitude Validity Discrete
A Attitude Validity Discretes may be used by EGPWS for the Pitch and Roll signals.
Type: Validity from vertical gyro or attitude computer.
Signal Status:
Valid or Invalid
Level 6 Audio readout
Attitude Validity Discrete
Valid =>
Invalid =>
“Attitude Valid”
“Attitude Invalid”