Honeywell MK VI - Manual (Page 57)

Honeywell
MK VI MK VIII EGPWS Installation Design Guide
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3.4 Category 2 – Air Data Input Select
Category 2 defines the Air Data interface. The Air Data input currently defines 4 analog and 6 digital air data
types.
Appendix E Table 5.3.2 defines the Air Data interface options and identifies the first MK VI/MK VIII EGPWS
version in which the option was available (see the Effectivity entry).
Appendix E Tables 5.3.2-x, where x is the Air Data Type number, define the electrical interfaces required to
support each Air Data Type.
3.4.1 Analog (Ca t. 2 ID 0, 3, 4, 11, 12)
Air Data Type 0 (CIC 04077 or equivalent) uses Uncorrected Barometric Altitude input scaled from –1500 feet
(+5 volts) to +30,000 feet (+15 volts) (see Appendix E section 6.1.3). Baro Altitude Rate and Computed
Airspeed are not required. Baro Altitude Valid is standard +28 volt discrete. Total Air Temperature is from a
dedicated (EGPWS) 500-ohm probe using +5 volt excitation from the MK VI/MK VIII EGPWC.
Air Data Type 3 (ADS-65 or equivalent) uses Uncorrected Barometric Altitude input scaled from -1500 feet (-
0.18 volts) to +46,000 feet (+5.52 volts), zero volts equals zero feet (see Appendix E section 6.1.10). Baro
Altitude Rate and Computed Airspeed are not required. Baro Altitude Valid is standard +28 volt discrete. Total
Air Temperature is from a dedicated (EGPWS) 500-ohm probe using +5 volts excitation from the MK VI/MK VIII
EGPWC.
Air Data Type 4 (CIC 02702 or equivalent) uses Uncorrected Barometric Altitude input scaled from -1000 feet (-
0.244 volts) to +40,000 feet (+9.756 volts) (see Appendix E section 6.1.14). Baro Altitude Rate and Computed
Airspeed are not required. Baro Altitude Valid is standard +28 volt discrete. Total Air Temperature is from a
dedicated (EGPWS) 500-ohm probe using +5 volt excitation from the MK VI/MK VIII EGPWC.
Air Data Types 11 and 12 (AZ-241, AZ-242, AZ-800, AZ-810 or equivalent) uses Uncorrected Barometric
Altitude input scaled from -3750 feet ( 0 volts) to +50,000 feet (+10.75 volts) (see Appendix E section 6.1.16).
Baro Altitude Rate and Computed Airspeed are not required. Baro Altitude Valid is standard +28 volt discrete. ID
11 requires a dedicated (EGPWS) 500-ohm Total Air Temperature probe using +5 volt excitation from the MK
VI/MK VIII EGPWC. ID 12 is configured without a connection to outside air temperature with temperature set not
available. As a result, when using ID 12 the EGPWS calculation of Geometric Altitude will be less accurate than
using ID 11.
NOTE: The analog air data interface for the MK VI / MK VIII EGPWS uses a dedicated 500-ohm temperature
probe. This may be an unused element in a dual element probe but must not be paralleled with any
other system. The EGPWS provides the 5 volt excitation for the element.