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Part Three: Section 2

TAWS Operation

lapse rates have ﬁxed values), it is common for the

baro-corrected altitude (as read from the altimeter)

to differ from the GPS-MSL altitude. This variation

results in the aircraft' s true altitude differing from the

baro-corrected altitude.

Power Up

During power-up of the 500W Series unit, the

terrain/obstacle database versions are displayed along

with a disclaimer to the pilot. At the same time,

TAWS self-test begins. TAWS gives the following aural

messages upon test completion:

• "TAWS System Test, OK", if the system passes the test

• "TAWS System Failure", if the system fails the test

A test failure is also annunciated for TAWS, as

shown in the TAWS Alert Summary table.

TAWS Page

The TAWS Page is in the NAV group of pages (see

the 500W Series Pilot' s Guide for detailed information

regarding page groups and pages).

The TAWS Page

To display the TAWS Page, select the NAV group

and turn the small right knob until the TAWS Page

is displayed. Terrain information, aircraft ground

track, and GPS-derived MSL altitude are displayed

on the page. Altitude is shown in increments of 20

feet or in increments of 10 meters, depending on unit

conﬁguration. The "G" to right of the MSL altitude

display reminds the pilot that altitude is GPS-derived.

The TAWS Page has two selectable view settings:

120

Viewing Angle on the TAWS Page

•360˚ View—View from above aircraft depicting

surrounding terrain on all sides

•120˚ View—View of terrain ahead of and 60˚ to

either side of the aircraft ﬂight path

NOTE: The TAWS Page gives a "Track Up" display

orientation, as indicated by the "TRK" label shown on

the display. This is the only orientation available for the

TAWS Page.

To display a 120˚ view:

Select the TAWS Page and press MENU. Select

"View 120˚?".

Press ENT. The TAWS Page displays the 120˚

view. To change to a 360˚ view, repeat step 1,

select "View 360˚?", and press ENT.

Seven display ranges are available, allowing for a

more complete view of the surrounding area.