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B
This feature compares barometric altitude with GPS altitude and generates a
"Check Altitude" message when an error is detected.
This is a highly recommended option, which can alert a pilot to problems such
as a stuck altimeter or plugged static port. This option requires no additional
hardware and is enabled during the system installation by programming the
configuration module. This feature can provide both audio and display mes-
sages.
3. Outside Air Temperature (OAT) (Recommended)
The EGPWS supports an OAT probe for aircraft operated in cold environ-
ments. Very cold air temperatures cause an increase in the density of the air
mass and can result in barometric altimeter errors, both in sensitive altime-
ters/encoders and blind encoders. Aircraft normally operated in very cold cli-
mates can benefit from the addition of an OAT probe interfaced to the
EGPWS. If the aircraft is equipped with an Air Data Computer which outputs
Digital data with Corrected Altitude on an ARINC 429 port, this can be used
instead of an encoder and external OAT Probe. OAT is programmed into the
configuration module during system installation
1.4
TECHNICAL CHARACTERISTICS
TSO COMPLIANCE:
PHYSICAL DIMENSIONS:
WEIGHT:
Installation Kit
POWER REQUIREMENTS:
Table 1-4 KMH 820 w/o GPS Multi-Hazard Awareness Unit Technical Specifications
Rev 3, August/2002
KMH 820 w/o GPS MULTI-HAZARD AWARENESS UNIT
P/N 066-01175-0101
10609I03.CDL
See
Appendix E
See
Figure 2-1
See
Figure 2-1
050-03361-0000
Voltage
Nominal:
+28 Vdc
Range:
Current
Nominal:
Max Operating 1.65 ± 0.2 A
Bootup:
46 ± 2.3 Watts
Power
KMH 880/KTA 870
+22 to +30 Vdc
1.3 ± 0.2 A
3.3 ± 0.5 A
Page 1-9
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