EGPWS LINE MAINTENANCE MANUAL
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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”
3.8.7 SELF-TEST DISCRETE
Type: Supplied by momentary actuated cockpit self-test switch
Signal Status: Self-Test or Normal
Fault monitoring: Activation of this input continuously for more than 60 seconds will result in the "Self-Test Invalid”
fault which will cause a GPWS INOP indication.
Note: This input is used to start and stop the Level 6 Self-Test, there is no audio output for this discrete in Level 6.
3.8.8 STEEP APPROACH DISCRETES
To activate Steep Approach, both of the Steep Approach discretes must be selected. Discrete #1 should be enabled
if Steep Approach is to be used, and can be permanently enabled. Discrete #2 should be selected in flight when
starting a steep approach, it should not be permanently selected. On ground Self-Test is inhibited if Steep Approach
is active.
3.8.8.1 STEEP APPROACH DISCRETE #1 (MK V AND MK VII ONLY)
Type: Steep Approach Enabled
Signal Status: Steep Approach Enabled or Disabled
Level 6 Audio readout
Steep Approach Discrete #1
Enabled =>
Disabled =>
“Steep Approach Enabled”
“Steep Approach Disabled”
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