Honeywell
MK VI MK VIII EGPWS Installation Design Guide
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CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO: 060-4314-150 REV: SHEET 105
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 aground to the Landing Gear input discrete when the aircraft is less than 5 to 20 feet Radio Altitude. See theHoneywell KRA 405B Installation Manual (006-10536-0003) for details of the Adjustable Trip output. Use ofAdjustable Trip outputs of the KRA 405B requires CM2000 Configuration Module along with KPA900Configuration Module Programmer, PC and software. The Collins ALT-55 (622-2855-001 only) also provides 4shop 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
J1P1
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 LandingGear discrete ground when the aircraft is less than approximately 40 knots airspeed (approach airspeed variesby aircraft). Contact Honeywell EGPWS engineering for assistance in adapting this discrete input design to youraircraft.