82046-PG-B1
ST3400H PILOT’S GUIDE
Page 3-1
3
WELCOME TO THE ST3400H HELITAWS
3.1 Description
Sandel HeliTaws is a self-contained Helicopter Terrain Awareness
Warning System and which both meets the FAA C194 requirements and
exceeds these requirements with additional display and protection modes
and features. It includes an advanced HTAWS computer, a GPWS
computer, graphics symbol generator and Sandel’s high brightness display
engine built within a standard 3-inch instrument chassis. It includes Radar
Altimeter features and can be used to directly replace an existing Radar
Altimeter indicator. It has the optional capabilities of acting as a primary or
secondary traffic indicator, showing traffic either in standard TCAS format
or overlaid on terrain when connected to an external traffic detection
system.
Terrain protection is enabled during all airborne phases of flight -
Departure, Enroute, Terminal, and Approach and in any selected display
mode.
Pilot selection of low-sensitivity and off-airport operational modes, allows
nuisance-free protection in very demanding missions.
The terrain display features a new plan-view 3D shaded format with
industry leading terrain resolution, providing an unmatched understanding
of the terrain surrounding the helicopter and its contours.
3.2
What it is
The ST3400H is a situational awareness tool and an alerting and warning
device. It is designed to reduce the incidence of CFIT accidents by
providing increased situational awareness of the surrounding terrain and
obstacles, both in VMC and in IMC under Instrument Flight Rules.
The unit supports optional external caution and warning annunciators and
optional external mounted momentary switches to control certain functions
such as alert muting and modes.
The ST3400H uses Sandel’s patented rear-projection display technology.
This technology allows the displayed image to extend to the edges of the
instrument’s bezel. Therefore, even though the Sandel display is in a 3-
inch form factor, its image is approximately the size of a 4” primary
display.
