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Terrain Pull Up
(FLTA warning)
FLTA Disengage
autopilot/immediately
level
wings.
Apply full power, establish a climb attitude.
Continue maneuver until alert ceases or
terrain clearance is assured.
Terrain, Terrain
(GPWS warning)
ECRTNL
ECRTL
Apply power, level wings, and establish a
climb attitude.
Too Low Flaps
(GPWS caution)
FITNLB Select
landing
flaps
Too Low Gear
(GPWS caution)
FITNLA
If conditions permit, extend the landing
gear.
Otherwise, execute go around.
Too Low Terrain
(caution)
FITNLC
PDA
Immediately arrest sink rate and fly out of
the alert area
Alert Circle
The Alert Area Indicator circle shows the location of the current alert for
FLTA alerts. No circle is shown for GPWS or PDA alerts. Do not assume
the terrain threat is in the exact center of the circle. Also, remember the
circle only represents the
closest
threat. Other real or potential threats may
exist but
will not
be circled.
Since the exact location of the aircraft and the exact location of the terrain
is subject to uncertainties and tolerances, the terrain threat may be
anywhere
inside the circle.
The visual alert annunciation is displayed at the bottom of the screen and a
simultaneous non-mutable audible alert will occur on the cockpit audio
system.
Warnings are shown in red, and Cautions are shown in amber. If external
annunciators are installed, they will display simultaneously with the on-
screen annunciations.
TAWS Inhibit
FLTA and PDA alerting, can be inhibited using the Pilot’s Menu TAWS
INHIBIT (or if installed the external TAWS INH pushbutton). This
function also inhibits REL and PRED displays. This is used for three
distinct purposes:
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ST3400 TAWS/RMI PILOT’S GUIDE
PAGE 49
a) Abnormal failure of FMS resulting in erroneous data. A
conventional (flagged) FMS failure will automatically fail alerts
and the terrain display. *
b) If a TAWS alert is previously determined to be erroneous and is
repetitive at a specific location, to eliminate the alert. A perceived
nuisance alert should be brought to the attention of Sandel for
analysis.
c) To perform an off-airport or a landing at an airport that is not in
the ST3400 database. The presence/absence of an airport in the
database can be visually confirmed by looking at the ST3400
screen in any terrain view. If the airport does not show as a circle
with identifier (or runways at lower ranges) within 20nm then it is
not in the database. If the airport is absent, you can expect to
receive more than one type of terrain alert on the descent to the
airport within 1000’-1500’ AGL. The Alert Inhibit function
provides the ability to cancel these alerts.
Be aware that the TAWS INH function cancels all FLTA and PDA alerts
but does not cancel basic GPWS alerting modes 1-6. By regulation, there
is no provision to disable GPWS modes except by pulling the TAWS CB.
* Note: If it is desired to fail the Taws Alerts and remove the on-screen
“X”, operate TAWS INH and place the ST3400 in RMI mode.