Honeywell MK XXII Manuale Utente

EGPWS LINE MAINTENANCE MANUAL 

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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” 

 

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. 

 

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. 

 

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”