3.8.5 +28V LANDING FLAP OR FLAP OVERRIDE DISCRETE
Type: Supplied by Flap or Flap selector handle switch. This input can be paralleled with, or used exclusively by a Flap Override Switch if an alternate source of Flap Position is used.
Signal Status: Landing Flaps or Not Landing Flaps
Fault monitoring: Indication of landing flaps selected for more than 60 seconds at airspeeds above 250 knots will result in a flap switch fault which will cause a GPWS INOP indication.
Note: This can be caused either by a flap switch fault or by the Flap Override switch being left in the on position.
Level 6 Audio readout
+28 V Landing Flaps Discrete
Selected => “28V Flaps Selected”
or Flap Override
Not Selected => “28V Flaps Not Selected”
Note: If Flap Reversal Program Pin is enabled for MK VII EGPWC, the Audio readout will be:
Level 6 Audio readout
GND Landing Flaps Discrete Selected => “Flaps Selected”
or Flap Override Not Selected => “Flaps Not Selected”
3.8.6 FLAP POSITION DISCRETES
Up to four flap position discretes are typically supplied from the flap selector handle switch.
Type: Supplied by Flap selector handle switch.
Signal Status: Flap position selected.
Fault monitoring: Depending on the installation, activation of more than one, or none of these discretes for more than
30 seconds will result in a Flap Unreasonable indication.
Level 6 Audio readout
Flap Position Discrete #1 Selected => Not Selected => “Flap 1 True” “Flap 1 False”
Flap Position Discrete #2 Selected => Not Selected => “Flap 2 True” “Flap 2 False”
Flap Position Discrete #3 Selected => Not Selected => “Flap 3 True” “Flap 3 False”
Flap Position Discrete #4 Selected => Not Selected => “Flap 4 True” “Flap 4 False”
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