Garmin GNC 420, Руководство по установке

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400 SERIES INSTALLATION MANUAL Page 4-21
190-00140-02 Rev Q
4.11 TERRAIN
Terrain Awareness and Warning System (TAWS) is meant to provide the flight crews with both aural and
visual alerts to aid in preventing an inadvertent Controlled Flight Into Terrain (CFIT) event. While the 400
Series unit cannot be fully TSO-C151b Class B TAWS capable due to hardware constraints, a TERRAIN
version is available. The 400 Series TERRAIN version is intended to provide a non-TSO-C151b-certified
TAWS-like capability.
The table below highlights the functional differences between TAWS, TERRAIN, and None.
Function TAWS TERRAIN None
TSO-C151b Class B Certified Yes No No
TAWS/TERRAIN Display
( Shows terrain elevations relative to the aircraft )
Yes Yes No
Visual Alerting
( Includes popup alerting )
Yes Yes No
Aural Alerting Yes No No
External Visual Alerting Capability Yes No No
Reduced Terrain Clearance (RTC) Avoidance
( Forward Looking Terrain Avoidance (FLTA) sub-
function )
Yes Yes No
Imminent Terrain Impact Avoidance
( Forward Looking Terrain Avoidance (FLTA) sub-
function )
Yes Yes No
Premature Descent Alert (PDA) Yes Yes No
Excessive Rates of Descent Alert
( Ground Proximity Warning System (GPWS) Alerting
sub-function )
Yes No No
Negative Climb Rate/Altitude Loss After Takeoff
( Ground Proximity Warning System (GPWS) Alerting
sub-function )
Yes No No
“Five Hundred” Voice Callout
( Ground Proximity Warning System (GPWS) Alerting
sub-function )
Yes No No
Inhibit Capability
( Inhibits FLTA and PDA visual and aural alerting )
Yes Yes No
TAWS Test System Capability Yes No No
Worldwide Terrain Database Yes Yes No
Airport Layer Database Yes Yes No
Obstacle Database Yes Yes No
400 Series TERRAIN functionality is a subset of TAWS functionality and has been certified as a non-TSO
function. As such, a subset of TSO-C151b specification is used as the requirement basis.
400 Series TERRAIN functionality is not designed nor approved for use in helicopters.