Steep approach discrete #2, Timed audio inhibit discrete, Gpws inhibit discrete – Honeywell MK VI User Manual
Page 302: Localizer validity discrete #1
Honeywell
MK VI MK VIII EGPWS Installation Design Guide
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6.6.25 Steep Approach Discrete #2
Activates steep approach biasing if Steep Approach Enabled is true (see Category 7, Section 5.3.7).
Alt. Action Type: Supplied by an alternate action (latching) and self indicating cockpit switch .
Momentary Type: Supplied by a momentary (non-latching) switch with switch lamp driven by EGPWS Steep Approach
Discrete output.
Signal Status:
Steep Approach Selected or not Selected
Fault monitoring: None if Steep Approach Enabled is false. EGPWS Self-Test is inhibited if Steep Approach Enabled is
true and Steep Approach Discrete #2 is “Selected” on the ground. For momentary switch inputs,
activation of this switch input for more than 15 seconds will result in the “Steep Approach Invalid”
fault which will cause a GPWS INOP indication.
Level 6 Audio readout
Steep Approach Discrete #2
Selected =>
Not Selected =>
“Steep Approach Selected”
“Steep Approach Not Selected”
6.6.26 Timed Audio Inhibit Discrete
Type:
Supplied by a momentary action (internally latching) and indicating cockpit switch for inhibit of audio functions.
Signal Status:
Audio Inhibit or not Inhibit
Fault monitoring: The Audio Inhibit function does not inhibit Self Test, therefore, “Timed Audio Inhibited Fault” will be
enunciated during cockpit Level 2 Self Test.
Level 6 Audio readout
Timed Audio Inhibit Discrete
Selected =>
Not Selected =>
“Timed Audio Inhibit”
“Timed Audio Not Inhibit”
6.6.27 GPWS Inhibit Discrete
This discrete inhibits all audio and visual except for Windshear, Terrain Awareness and TCF.
Type:
Supplied by an alternate action (latching) and self indicating cockpit 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 GPWS INOP indication.
Level 6 Audio readout
GPWS Inhibit Discrete
Selected =>
Not Selected =>
“GPWS Inhibit”
“GPWS Not Inhibit”
6.6.28 Localizer Validity Discrete #1
A Localizer Validity discrete may be used by the EGPWS for localizer input from an ARINC 547 Nav Receiver.
Type:
Validity from ARINC 547 Nav Receiver
Signal Status:
Valid or Invalid
Level 6 Audio readout
Localizer Validity Discrete #1
Valid =>
Invalid =>
“Localizer 1 Valid”
“Localizer 1 Invalid”