Discrete word \(273\) – bendix weather radar v, Discrete word \(275\) – ic600 only, Radio altitude (164) – Honeywell MK VI User Manual
Page 285: Glideslope deviation (174 or 117)
Honeywell
MK VI MK VIII EGPWS Installation Design Guide
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Bits 14 to 16 = Mode, format as follows
Bit 16
Bit 15
Bit 14
MODE
0
0
0
Standby
0
0
1
Weather Only
0
1
0
Map Only
0
1
1
Windshear Hazard Factor
1
0
0
Test
1
0
1
Windshear and Turbulence
1
1
0
Weather and Turbulence
1
1
1
Windshear Icon
6.2.27 Discrete Word (273) – Bendix Weather Radar Vertical Profile Mode
Discrete Word
Source: EFIS/Weather Radar
LABEL (Octal) 273
Units: N/A
Max. Range: N/A
Approx. LSB: N/A
Data Bit: 11
+ = N/A
Sign Bit: N/A
Pad Bits: N/A
Transmit Interval (mSec): 100 ms
Data Type: Discrete
SDI Bits: 9, 10
Some display systems support a vertical profile WXR display where the radar scans up and down. This mode can not
support a terrain display. Therefore when this mode bit is set (indicating that the profile mode is active) the EGPWS is to
treat this as a non-displayable mode.
Mode
bit 11
Displayable
Vertical Profile On
1
No
Vertical Profile Off
0
Yes
6.2.28 Discrete Word (275) – IC600 only
Discrete Word - (IC600 Packed Discrete Word 4)
Source: IC
LABEL (Octal) 275
Units: N/A
Max. Range: N/A
Approx. LSB: N/A
Data Bits: Bit 17: See TABLE
+ = N/A
Sign Bit: N/A
Pad Bits: N/A
Transmit Interval (mSec): 500 ms
Data Type: Discrete
SDI Bits: 9, 10
BIT ASSIGNMENTS
Discrete Data
Bit Definition
IC outputting MFD format
(its range is displayed)
Bit 17 = 1: IC Driving Display
Bit 17 = 0: IC not Driving Display
6.2.29 Radio Altitude (164)
RADIO ALTITUDE
Source: ARINC 707 LRRA or IOC
LABEL (Octal) 164
Units: Feet
Max. Range:
±
8,192 Feet
Approx. LSB: 0.125 Foot
Data Bits: 13 to 28 = 16
+ = Above Ground Level (AGL)
Sign Bit: 29
Pad Bits: 11, 12
Transmit Interval (mSec): 25 to 50
Data Type: 2’s Complement Binary
SDI Bits: 9, 10
6.2.30 Glideslope Deviation (174 or 117)
GLIDESLOPE DEVIATION
Source: ARINC 710 ILS or IOC
LABEL (Octal) 174 or 117
Units: See NOTE
Max. Range:
±
0.8 DDM
Approx. LSB: 0.000195 DDM
Data Bits: 17 to 28 = 12
+ = Fly Down = Above Beam C/L
Sign Bit: 29
Pad Bits: 11 to 16
Transmit Interval (mSec): 33.3 to 66.6
Data Type: 2’s Complement Binary
SDI Bits: 9, 10
NOTE: Units = Difference in Depth of Modulation (DDM) 0.0875 DDM = 1 ‘Dot’.