IFD500 Series Pilot Guide
Map Subsystem 4-55
HELICOPTER TAWS (HTAWS)
When both the TAWS and HELO options are enabled (see page 5-
88), the IFD provides an HTAWS function. HTAWS includes only
FLTA and Altitude Callout functions.
When an HTAWS warning condition is active, the associated aural
alert cannot be muted.
HTAWS has a “reduced protection” (RP) mode that reduces the
protection limits in order to prevent nuisance alerts. The lower
protection limits cause the IFD to generate alerts as late as possible,
while still meeting the regulatory requirements.
When HTAWS is enabled, and HTAWS is in an other than nominal
state, the HTAWS status overlays the upper left position in the data
strip, as illustrated below.
HTAWS Status Annunciation
The status is displayed on a background indicating the severity of the
condition; red for warnings, yellow for cautions, and cyan for
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