Garmin GNC 420W Pilot's Manual Addendum - Page 35

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Also for Garmin GNC 420W: Pilot's Manual Addendum (24 pages), Quick Reference (23 pages), Pilot's Manual Addendum (24 pages), Supplementary Manual (12 pages), Quick Reference Manual (25 pages)

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To change the display range:

Select the TAWS Page and press up or down

on the RNG key to select the desired range:

1 NM, 2 NM, 5 NM, 10 NM, 25 NM, 50 NM,

100 NM.

Aviation information such as airports, VORs, and

other navaids can be turned on or off on the TAWS

Page.

To show or hide aviation information:

Press MENU.

Select "Show (or Hide) Aviation Data?" and

press ENT. Pressing the CLR key when the

TAWS Page is displayed can also be used to

toggle aviation information on or off.

Aviation Data

Inhibit Mode

TAWS provides an "inhibit mode". This mode is

designed to deactivate PDA/FLTA aural and visual

alerts when they are deemed unnecessary by the

aircrew. Flying VFR into an area where unique terrain

exists could cause the system to annunciate a nuisance

alert. Pilots should use discretion when inhibiting

the TAWS system and always remember to enable the

system when appropriate. Only the PDA and FLTA

alerts are disabled in the inhibit mode. See section 3

for more information on TAWS alerts.

Inhibiting Terrain

To inhibit PDA and FLTA alerts:

Select the TAWS Page and press MENU.

"Inhibit Terrain?" is selected by default.

Press ENT. The PDA/FLTA alerts are inhibited.

The

annunciation is displayed in

the terrain annunciator ﬁeld whenever terrain

is inhibited.

To enable PDA and FLTA alerts:

Select the TAWS Page and press MENU.

"Enable Terrain?" is selected by default.

Press ENT. The PDA/FLTA alerts are functional

again.

External TAWS Inhibit Control

An optional installation is allowed for providing

an external TAWS Inhibit switch. Pressing the external

TAWS Inhibit switch toggles the TAWS inhibit on and

off in the same manner as using the Page Menu selec-

tion.

Part Three: Section 2

TAWS Operation