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MK VI MK VIII EGPWS Installation Design Guide
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6 CONFIGURABLE INPUT DATA DEFINITION
This section defines the EGPWS input signal characteristics or data word formats for input signals commonly used in
MK VI and VIII EGPWS applications. See Section 5 for specific information on signal usage.
6.1 Analog Input Data
6.1.1 ARINC 552 Radio Altimeter
Data Item Value
Signal Name: Radio Altitude, ARINC 552
AIC Algorithm: ARINC 552A Radio Altitude
Signal Dynamic Range: –100 to +3566 Feet
Signal Reasonable Range: –30 to +2800 Feet
Signal Open Wire Threshold –50 Feet
Reference Dynamic Range: None
Reference Reasonable Range: None
Scale:
For Radio Altitude
≤ 480 feet:
Volts
in
= (0.02 * RALT (ft)) + 0.4
For Radio Altitude > 480 feet:
Volts
in
=
))
500
20 + (ft) RALT
(Ln + (110 ×
Input Signal Connection: (+) = J1-64, (–) = J1-45
Input Reference Connection: None
AIC Name: D1 (DC1)
External Validity Flag Connection: J1-29
AIC LSB: 0.25 Feet
AIC Status Mask: 0000200C
External Validity Type: Discrete Validity
6.1.2 ALT 55 Radio Altimeter
Data Item Value
Signal Name: Radio Altitude, ALT 55
AIC Algorithm: DC Absolute
Signal Dynamic Range: –100 to +3200 Feet
Signal Reasonable Range: –30 to +2800 Feet
Signal Open Wire Threshold –50 Feet
Reference Dynamic Range: None
Reference Reasonable Range: None
Scale:
For Radio Altitude
≤ 500 Feet (≤ 10.4 VDC):
Volts
in
= (0.02 * RALT) + 0.4 or
RALT (ft) = 50 ft/VDC * Volts
in
– 20 ft
For Radio Altitude > 500 feet (> 10.4 VDC):
Volts
in
= 0.003 * (RALT –500) + 10.4 or
RALT (ft) = 333.3333 ft/VDC * Volts
in
– 2966.7
Input Signal Connection: (+) = J1-64, (–) = J1-45
Input Reference Connection: None
AIC Name: D1 (DC1)
External Validity Flag Connection: J1-29
AIC LSB: 0.25 Feet
AIC Status Mask: 0000200C
External Validity Type: Discrete Validity