82002-PG-F
ST3400 TAWS/RMI PILOT’S GUIDE
PAGE 26
DIRECTIONAL SOURCE READOUT
Display Indicator
Description
TRK
Aircraft’s magnetic track. When TRK is not available,
as when stationary on the ramp, changes to HDG.
HDG
Aircraft’s magnetic heading. Displayed when
aircraft’s track is not available or in RMI mode.
NO DIR
Displayed when both aircraft track and aircraft
heading are not available or invalid.
DIRECTIONAL SOURCE READOUT AND DISPLAY ORIENTATION
Input Data
TRK HDG
Readout Display
Orientation
No
No
NO DIR
No Display
Yes No
TRK
Trk,
unsmoothed
Yes Yes
TRK
Trk,
smoothed
TRK = Magnetic ground track HDG = Magnetic heading
Range Ring
The Range Ring displays the current terrain or TFC range in NM (Nautical
Miles). The Range Ring is a full circle in the FULL view mode and a 70°
arc in the ARC view mode. Switching between FULL and ARC view
maintains the terrain cells the same size during range changes. Range is
not displayed in the RMI display mode.
Press the [
] button to increase the current range.
Press the [
] button to decrease the current range.
RANGE RING
View
Ranges (Terrain)
FULL
1, 1.5, 2.5, 5, 10, 20, 40
ARC
2, 3, 5, 10, 20, 40, 80 (not available for TFC)
The TFC display maintains its own range memory. Thus when switching
between terrain and TFC, two different ranges may be pre-selected. The
maximum range for TFC is dictated by the type of equipment installed; it
may be less than 40 miles. ARC mode is not available on the TFC screen.
82002-PG-F
ST3400 TAWS/RMI PILOT’S GUIDE
PAGE 27
Display During Alerts
Unless TAWS INH has been selected, if an alert occurs the REL terrain
view is displayed in ARC view at an appropriate range to put the terrain
conflict on the screen.
If TAWS INH has been previously selected, classic GPWS alerts are still
enabled but terrain is not shown and is replaced by a yellow ‘X’ in the
REL and PRED display modes.
External Switch/Annunciators
External Switch/Annunciators may be installed, if required or desired.
The supported external annunciators are CAUT, WARN and GPWS FAIL.
The support external switch/annunciators are TAWS INH, GS OVRD and
FLAP OVRD.
CAUT illuminates simultaneously whenever an amber caution is
present on the ST3400 display.
WARN illuminates simultaneously whenever a red warning is
present on the ST3400 display.
GPWS FAIL illuminates whenever the GPWS FAIL indication is
shown on the ST3400 display.
TAWS INH illuminates whenever TAWS INH is shown on the
ST3400 display. It also illuminates when TAWS alerts are
inhibited for any other reason, such as loss of GPS signal, no
terrain data, etc. This will correspond with a flagged terrain
display. (Expect this condition on initial power-up while the
terrain database is being initialized.)
GS OVRD illuminates whenever GS OVRD is shown on the
ST3400 display.
FLAP OVRD illuminates whenever FLAP OVRD is shown on the
ST3400 display.
Pressing
external
TAWS INH, GS OVRD, or FLAP OVRD has the same
function as the Pilot’s Menu TAWS INH, GS OVRD, or FLAP OVRD,
respectively.
Note: External annunciators for CAUT and WARN are only required for a
two pilot aircraft equipped with a single ST3400. Please refer to the
AFMS for details on the specific installation in your aircraft.
