The ST3400 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 it remains directly in the pilot’s field-of-view.
The ST3400 includes built-in warning and caution annunciation. The unit also
supports optional external warning or caution annunciation.
The ST3400 may be installed in a pilot-only or dual pilot/copilot configuration.
The ST3400 has an internal recorder that automatically records ten hours of flight
data. This data can be reviewed for content in the event of a system malfunction.
1.2.2 TAWS Description
TAWS is the enhanced terrain warning technology that replaces the older GPWS
(Ground Proximity Warning System) technology. It is also known as EGPWS
(Enhanced GPWS).
TAWS adds two new and critical capabilities, FLTA (Forward Looking Terrain
Avoidance) and PDA (Premature Decent Alert) to the standard GPWS functions.
The six standard GPWS functional modes are:
• ERD (excessive rate of descent)
• ECRT (excessive closure rate to terrain)
• ALAT (altitude loss after takeoff)
• FITNL (flight into terrain when not in landing configuration)
• EDGSD (excessive downward glide slope deviation).
• 500’ Voice Callout
The ST3400 can be configured either as a Class A TAWS compliant system or as
a Class B TAWS compliant system depending on the availability of radar
altimeter and airdata.
When configured as a Class B TAWS system, the ST3400 exceeds Class B
TAWS requirements. Even in Class B mode without radar altimeter, the ST3400
has additional Class A features such as a display and an excessive glide slope
deviation alert. See the POH for additional information
CLASS A TAWS FUNCTIONAL REQUIREMENTS
Forward Looking Terrain Alert
Excessive Rate of Descent
82002-IM-L ST3400 INSTALLATION MANUAL
1-11
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