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GPS 500 Pilot’s Guide and Reference

11-6

SECTION 11

TAWS

Table 11-3 shows system status annunciations that may also be issued:

Alert Type

TAWS Page

Annunciation

Pop-Up Alert Aural Message

TAWS System Test Fail None “TAWS System Failure”

TAWS Alerting is disabled None None

No GPS position or excessively degraded

GPS signal

None “TAWS Not Available”

“TAWS Available” is generated when sufﬁcient

GPS signal is re-established.

System Test in progress None None

System Test pass None None “TAWS System Test OK”

Table 11-3 Additional System Annunciations

Forward Looking Terrain Avoidance

The Forward Looking Terrain Avoidance (FLTA) alert is used by TAWS and is composed of:

• Reduced Required Terrain Clearance (RTC) and Reduced Required Obstacle Clearance (ROC) -These alerts are

issued when the aircraft ﬂight path is above terrain, yet is projected to come within the minimum clearance

values in Table 11-4. When an RTC or ROC alert is issued, a potential impact point is displayed on the TAWS

Page.

• Imminent Terrain Impact (ITI) and Imminent Obstacle Impact (IOI) - These alerts are issued when the

aircraft is below the elevation of a terrain or obstacle cell in the aircraft’s projected path. ITI and IOI alerts are

accompanied by a potential impact point displayed on the TAWS Page. The alert is annunciated when the

projected vertical ight path is calculated to come within minimum clearance altitudes in Table 11-4.

Phase of Flight Minimum Clearance

Altitude Level Flight (ft)

Minimum Clearance

Altitude Descending (ft)

Enroute 700 500

Terminal 350 300

Approach 150 100

Departure 100 100

Table 11-4 Minimum Terrain and Obstacle Clearance Values for FLTA Alerts

During the nal approach phase of ight, FLTA alerts are automatically inhibited when the aircraft is below 200

feet AGL while within 0.5 nm of the approach runway or below 125 feet AGL while within 1.0 nm of the runway

threshold.

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Garmin GPS 500 Bedienungsanleitung Seite 182