EGPWS Functions and Features
Rev 2
KTA 970/KMH 980 Pilot’s Guide
006-18273-0000
52
As the pilot adjusts the flight path of the aircraft and a positive rate of
climb is re-established, the voice alert “Don’t Sink” will cease and the yel-
low caution annunciator lamp will extinguish.
NOTE: It is important for the pilot not to over-react to this situation. While
it is important to react quickly and positively to re-establish a positive rate
of climb, the pilot should remember that in the take-off / initial climb seg-
ment, the margin above stall speed for many aircraft is fairly small, and
thus must be respected.
GA-EGPWS ALTITUDE MONITORING
The GA-EGPWS monitors the various altitude and temperature (if used)
inputs that it receives during flight for the computation of Geometric
Altitude. If there is an abnormal difference detected among these alti-
tude values, the system can provide visual and voice alerts to the pilot.
Normal differences that are the result of non-ISA temperature conditions
or are due to high or low-pressure systems will not normally activate the
altitude monitor. Large errors due to faulty equipment or malfunctioning
pitot-static systems will normally be detected by the monitor.
When an abnormal altitude discrepancy is detected by the system, there
will be a single voice callout of “Check Altitude”. There will also be the
text message Chk Alt shown on the Terrain Display as long as the condi-
tion that triggered the alert persists.
The pilot should check all aircraft altimeters to ensure that the correct
altimeter setting is set, that altimeter systems cross-check and that the
pilot’s altimeter is not stuck and indicating an erroneous altitude.
ALTITUDE CALLOUT
The GA-EGPWS provides an altitude callout for the pilot, to indicate a
position approximately 500 feet above the elevation of the runway being
approached. When the aircraft is within 5 nm of a known runway, the
altitude callout function is active, and is then triggered when Geometric
Altitude shows the aircraft 500 feet above the known runway elevation
(from the system database). Example: “Five-Hundred Above” or “Five-
Hundred” based on audio menu selected during installation.
This callout is not accompanied by any annunciator lamp indications and
will occur only once per approach. The Altitude Callout is reset when the
aircraft climbs more than 700 feet above the runway elevation.
