Garmin GPS 500 Bedienungsanleitung PDF herunterladen (Seite 173)

GPS 500 Pilot’s Guide and Reference

10-7

SECTION 10

TERRAIN

Premature Descent Alerting

A Premature Descent Alert (PDA) is issued when the

system detects that the aircraft is signiﬁcantly below the

normal approach path to a runway (Figure 10-5).

PDA alerting begins when the aircraft is within 15 nm

of the destination airport. PDA alerting ends when the

aircraft is either:

• 0.5 nm from the runway threshold

• at an altitude of 125 feet AGL while within 1.0

nm of the threshold.

700

600

500

400

300

200

100

Height Above Terrain (Feet)

Distance From Destination Airport (nm)

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

“Too Low Terrain”“Too Low Terrain”

Runway

Threshold

Figure 10-5 PDA Alerting Threshold

TERRAIN Inhibit

TERRAIN also has an inhibit mode that deactivates the

FLTA/PDA visual alerts. Pilots should use discretion when

inhibiting TERRAIN and always remember to enable the

system when appropriate.

Inhibiting TERRAIN:

1) Select the TERRAIN Page and press the MENU

Key. ‘Inhibit Terrain?’ is selected by default

(Figure 10-6).

Figure 10-6 TERRAIN Page Menu

2) Press the ENT Key. The ‘TER INHB’ annunciation

is displayed in the TERRAIN annunciator ﬁeld

when TERRAIN is inhibited (Figure 10-7).

Annunciator Field

Figure 10-7 Annunciator Field

Enabling TERRAIN:

1) Select the TERRAIN Page and press the MENU

Key. ‘Enable Terrain?’ is selected by default.

2) Press the ENT Key. The TERRAIN system is

functional again.

190-00181-60 Rev. G

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