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EGPWS LINE MAINTENANCE MANUAL
CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO.: 060-4199-180 REV: G SHEET 47 of 68
3.8.33 MAGNETIC HEADING VALIDITY DISCRETE
A Magnetic Heading validity discrete may be used by EGPWS for the Magnetic 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”
3.8.34 AOA VANE HEATER DISCRETE
An AOA Vane Heater Discrete may be used by EGPWS for indication of vane heat for flight history recording.
Type: Heater Flag from AOA vane.
Signal Status: Vane Heater On or Vane Heater off
Level 6 Audio readout
AOA Vane Heater Discrete
True =>
False =>
“AOA Vane Heater On”
“AOA Vane Heater Off”
3.8.35 PLI DESELECT SWITCH DISCRETES (MK V AND MK VII ONLY)
PLI deselect switch discretes may be used by EGPWS for de-activating the PLI select relays to remove EGPWS PLI
indication from the ADI.
Type: momentary make/break switch
Signal Status: EGPWS PLI deselected
Level 6 Audio readout
PLI Deselect Switch #1
Pressed =>
Not Pressed =>
“PLI Deselect Switch 1 True”
“PLI Deselect Switch 1 False”
PLI Deselect Switch #2
Pressed =>
Not Pressed =>
“PLI Deselect Switch 2 True”
“PLI Deselect Switch 2 False”
3.8.36 AUTOPILOT DISCONNECT DISCRETES
Autopilot Disconnect discretes may be used by EGPWS for indication that the Autopilot has been disconnected.
Type: Autopilot Disconnected
Signal Status: Autopilot Connected or Not Connected
Level 6 Audio readout
Autopilot Disconnect #1
Connected =>
Not Connected =>
“Autopilot 1 Selected”
“Autopilot 1 Not
Selected”
Autopilot Disconnect #2
Connected =>
Not Connected =>
“Autopilot 2 Selected”
“Autopilot 2 Not
Selected”