400/500 Series Garmin Optional Displays
400/500 Series Garmin Optional Displays
400/500 Series Garmin Optional Displays
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Section 1: Introduction<br />
Overview<br />
PART FOUR<br />
TAWS INTERFACE<br />
<strong>Garmin</strong>’s Terrain Awareness Warning System (TAWS) is an optional feature for the GPS <strong>500</strong> and<br />
GNS 530/530A to increase situational awareness and aid in reducing controlled flight into terrain (CFIT)<br />
(Figure 1-1). <strong>Garmin</strong> TAWS satisfies TSO-C151b Class B requirements for certification. Class B TAWS is<br />
required for all Part 91 aircraft operations with 6 or more passenger seats and for Part 135 turbine aircraft<br />
operations with 6 to 9 passenger seats (FAR Parts 91.223, 135.154).<br />
Operating Criteria<br />
<strong>Garmin</strong> TAWS requires the following to operate properly:<br />
• The system must have a valid 3D GPS position solution<br />
• The system must have a valid terrain/obstacle database<br />
GPS Position and GPS-MSL Altitude<br />
<strong>Garmin</strong> TAWS uses information provided from the <strong>500</strong> <strong>Series</strong> GPS receiver to provide a horizontal<br />
position and altitude. GPS altitude is derived from satellite measurements. GPS altitude is converted to a<br />
Mean Sea Level (MSL)-based altitude (GPS-MSL Altitude) and is used to determine TAWS alerts. GPS-<br />
MSL Altitude accuracy is affected by factors such as satellite geometry, but is not subject to variations<br />
in pressure and temperature that normally affect pressure altitude devices. GPS-MSL Altitude does not<br />
require local altimeter settings to determine MSL Altitude. Therefore GPS altitude provides a highly<br />
accurate and reliable MSL altitude source to calculate terrain and obstacle alerts.<br />
Section 1<br />
Introduction<br />
Figure 1-1: <strong>Garmin</strong> TAWS satisfies TSO-C151b Class B<br />
requirements for certification<br />
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