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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:
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3.15.2.12 Terrain Pop up Discrete
Terrain Pop Up discrete (J1-51) will activate when a Terrain/Obstacle Caution or Warning alert event has
occurred. This feature activates the pop up in an integrated display or will switch a relay to pop up Terrain
display over selected weather radar display. The Pop Up discrete can be used by a display system to
differentiate between a manual Terrain display selection or Terrain display selection due to a Terrain/Obstacle
Caution or Warning alert event.
WXR System R/T
J2-37
J2-36
J1-58
J1-59
J1-51
J1-32
A
B
A
B
ARINC 453 TERRAIN BUS #1
ARINC 429 RANGE BUS
J1-54
Terrain Display Select #1 Discrete Output
Terrain Pop-Up Discrete Output
Display Select
Discrete #1 Input
DSD #1 Gnd
Discrete
Range #1
Discrete
TERR
ON
Momentary
A
* Display relay specifications:
- 4PDT - Continuous Duty Cycle
- Pickup Voltage: 13.5 Vdc Max. - Dropout Voltage: 7.5 - 2.0 Vdc
- Coil Resistance: nominal 500 Ohms (~100mA @ 28 Vdc)
- Coil Rating: 26.0 Vdc (nominal) 34 Vdc (max.)
- Contact V drop: < 125mV @ rated load
- Contact current rating: 2 Amps resistive @ 28 Vdc
28 VDC
DISPLAY RELAY *
429 IN 453 OUT
453 #1
J1-56
J1-57
A
B
453 #2
J2-41
J2-40
A
B
Range #2
J1-31DSD #2 Gnd
453 WX /
TERR BUS
A
B
A
B
TERRAIN
POP-UP
TERRAIN
SELECTED
429 Range
Output Bus
J2-43
J2-42
A
B
429 Tx
Spare #2
Spare #2
Spare #2
WXR/TERR
Display
EM6-disp.vsd
FIGURE 3.15-2 Example of Terrain Display Interface
TERR DISPLAY
OFF ON
Amber Green
+28V
+28V
EGPWS
J1-32
EGPWS
J1-54
TerrDisSw.vsd
Figure 3.15-3 Example of Terrain Display switch with relay