Honeywell MK VI - Manual (Page 105)

Honeywell
MK VI MK VIII EGPWS Installation Design Guide
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MK VI EGPWS
COMPUTER
FIXED LANDING GEAR/FLOAT AIRCRAFT
ALTERNATE AIR SWITCH ARRANGEMENT
(Example Shown: Twin Otter)
W*
* KRA 405B Adjustable
Trip pins W,V, & F.
KRA 405B
Adjustable Trip
Landing Flap Discrete (Gnd)
Landing Gear Discrete
(+28)
Power Input: +28VDC
Landing Gear Discrete
On Ground = DC Gnd 16
40
60
35
18
P1 J1
FLAPS UP
APPROACH
FLAPS
APPROACH FLAP
POSITION (5°-7°)
EGPWS
3 AMP
AIRCRAFT +28VDC
Not LANDING
LANDING
FULL LANDING FLAP
POSITION (16°-18°)
The Honeywell KRA 405B provides 3 programmable Adjustable Trip outputs that can be used to supply a
ground to the Landing Gear input discrete when the aircraft is less than 5 to 20 feet Radio Altitude. See the
Honeywell KRA 405B Installation Manual (006-10536-0003) for details of the Adjustable Trip output. Use of
Adjustable Trip outputs of the KRA 405B requires CM2000 Configuration Module along with KPA900
Configuration Module Programmer, PC and software. The Collins ALT-55 (622-2855-001 only) also provides 4
shop adjustable Trip outputs, pins 41,43,46, and 48, contact Collins Avionics for details.
Landing Flap Discrete
(Gnd)
MK VI EGPWS
COMPUTER
FIXED LANDING GEAR/FLOAT AIRCRAFT
ALTERNATE AIR SWITCH ARRANGEMENT
(Example Shown: Twin Otter)
Landing Gear Discrete
(+28)
Power Input: +28VDC
Landing Gear Discrete
On Ground = DC Gnd 16
40
60
35
18
J1 P1
Not LANDING
LANDING
FULL LANDING FLAP
POSITION (16°-18°)
APPROACH FLAP
POSITION (5°-7°)
FLAPS UP
APPROACH
FLAPS
EGPWS
3 AMP
AIRCRAFT +28VDC
NC
NO
AIR SWITCH
RELAY
DIODE
AIR SWITCH
(SHOWN AS A/C ON GROUND) NO
OPTIONAL EQUIPMENT
EXISTING ON AIRCRAFT
HOUR METER
+28VDC
AIR STREAM
~40 KNOTS ~
Some aircraft (ex: Twin Otter) have an air switch (flapper on the wing) that can be used to provide a Landing
Gear discrete ground when the aircraft is less than approximately 40 knots airspeed (approach airspeed varies
by aircraft). Contact Honeywell EGPWS engineering for assistance in adapting this discrete input design to your
aircraft.