Sandel ST3400H HeliTAWS, Руководство по установке

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1.4 Equipment Description
The Sandel ST3400H is a self-contained HTAWS (Terrain Awareness Warning System)
solution specifically for helicopters that includes an advanced HTAWS computer and an
integrated full-color screen built within a standard 3-inch instrument chassis.
The ST3400H uses Sandel’s patented rear-projection display technology. The projector uses a
miniature active-matrix LCD display that produces a high-resolution image that is rear-
projected directly to the face of the instrument. This technology allows the displayed image to
extend to the edges of the instrument’s bezel. The advantage of this edge-to-edge technology
is that it eliminates the unusable area surrounding conventional LCD and CRT displays. Even
though the Sandel display is in a 3-inch form factor, its image is near the size of a 4” primary
display, and can remain directly in the pilot’s field-of-view.
It can be used as a direct replacement for a currently installed Radar altimeter indicator. It
includes a MINS setter, MINS discrete output, and a Radalt Test discrete output.
The ST3400H includes built-in warning and caution annunciation. The unit also supports
optional external warning or caution annunciation as well as optional collective mounted
momentary switches to control certain functions such as alert muting and modes.
The ST3400H may be installed in a single or dual installation.
The ST3400H has an internal recorder that automatically records approximately twenty hours
of flight data. This data can be reviewed for content in the event of a system malfunction.
1.4.1 Features
HTAWS is the enhanced terrain warning technology for helicopters that uses GPS position
along with databases of terrain and obstacles to reduce or eliminate CFIT accidents. It is
similar to the Sandel ST3400 fixed-wing TAWS, with feature enhancements specific to
helicopter operations close to the ground.
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Increased vertical accuracy
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Separate obstacle database
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On-screen obstacle display
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3 arc-second terrain data
The following 5 standard GPWS functional modes (modified for helicopter) are provided for
when equipped with supported Radar altimeter and airdata computer:
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ERD (excessive rate of descent)
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ALAT (altitude loss after takeoff)
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FITNL (flight into terrain when not in landing configuration)
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EDGSD (excessive downward glide slope deviation).
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400 feet and below Voice Callouts
1.4.2 FAA HTAWS Requirement
The ST3400H exceeds the FAA requirements for HTAWS alerting, annunciation, and
display for installation in Part 27 and Part 29 helicopters
82046-IM-K ST3400H INSTALLATION MANUAL Page 1-2