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Honeywell
MK XXII EGPWS Installation Manual
CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO: 060-4314-225 REV: C
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aircraft that do not have another compatible source of outside air temperature. Outside Air
Temperature is used by the EGPWS along with pressure altitude in computing Geometric
Altitude. If Outside Air Temperature is not available, Geometric Altitude is computed using
pressure altitude with a corresponding reduction in accuracy.
Geometric Altitude is computed by the EGPWS to reduce or eliminate errors potentially induced
in corrected barometric altitude by temperature extremes, non-standard altitude conditions, and
altimeter miss-sets. Geometric Altitude also allows continuous EGPWS operation in QFE
environments without crew intervention.
1.5.5 Smart Cable (PCMCIA Interface)
The EGPWS Smart Cable (part number 951-0386-001) is a removable PCMCIA card interface.
The Smart Card is compatible with any Honeywell supplied EGPWS PCMCIA style cards. The
purpose of the Smart Cable in the EGPWS system is for upload of software and databases and
also for download of EGPWS Flight History. The Smart Card loading operation will closely
emulate that of an ARINC 615 Data Loader.