Honeywell MK VI - Manual (Page 289)

Honeywell
MK VI MK VIII EGPWS Installation Design Guide
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25 – 28 Navigation data source currently displayed on the
Primary Flight Display (PFD). The table below
show decimal values with bit 25 the LSB
* = Values currently used by EGPWC
00 = Not Used
01 = Not Used
* 02 = VOR/LOC #1
* 03 = VOR/LOC #2
04 = FMS #1
05 = FMS #2
06 = FMS #3
07 = Not Used
* 08 = MLS #1
* 09 = MLS #2
* 10 = ILS #1
* 11 = ILS #2
12 = NOTE 1
13 = NOTE 1
14 = Not Used
15 = Not Used
NOTE 1: Code 12 and Code 13 are currently assigned to TACAN Data source. Neither of these states are used
by the EGPWC to select or evaluate input data.
6.2.48 FWC & GP Discrete Word (171)
DISCRETE WORD – FWC & GP Source: FWC or GP (#1 & #2)
LABEL (Octal) 171 Units: N/A Max. Range: N/A Approx. LSB: N/A
Data Bits: Discrete word, see below + = N/A Sign Bit: N/A Pad Bits: none
Transmit Interval (mSec): 100 Data Type: Discrete SDI Bits: 9, 10
See below
Note: Several formats exist for this label. Format 1: is the default format. Format 2: will be specified if required in the
Display Input Control Group.
FWC or GP WORD BIT ASSIGNMENTS (Format 1)
Bit No. DEFINITION
Note: Not all of the following bits are necessarily used on a given aircraft, but all will be
processed. The usage depends on the aircraft avionics. For example, Steep
Approach is only supported in a limited number of installations, however, the bits
for Steep Approach are always monitored.
9, 10 SDI: 1/0 = Left Display Range; 0/1 = Right Display Range; 0/0 & 1/1 = No Range
11-14 Self Test command codes
BIT
11 12 13 14
0 0 0 0 = No Test command
0 0 1 0 = Short Level 1 Test command
0 1 0 0 = Long Level 1 Test command
0 1 1 0 = Level 2 Test command
1 0 0 0 = Level 3 Test command
1 0 1 0 = Level 4 Test command
1 1 0 0 = Level 5 Test command
1 1 1 0 = Level 6 Test command
0 0 0 1 = Self Test Cancel command
0 0 1 1 = Skip command
15 Glideslope Cancel (momentary)
16 Flap Override (alternate action)
17 Terrain Awareness & TCF Inhibit
18 Auto Range confirm (alternate action)
19 Landing Gear Down
20 Weight on Wheels
21 Low Altitude (momentary)