Fokker 50 - EGPWS;TAWS Alerts and Annunciations Table; EGPWS;TAWS Alerts and Annunciations

NOTE: The Obstacle Database provides only limited obstacle information, i.e.
data that is declassified by the authorities.
NOTE: The TAWS Terrain Database, Terrain Ahead Alerting and the TAWS
display do not account for man made obstacles.
• Geometric Altitude
Based on GPS Altitude, Geometric Altitude is a computed pseudobarometric altitude
Above Sea Level (ASL) designed to reduce or eliminate errors potentially induced in
Corrected Barometric Altitude by temperature extremes, nonstandard pressure altitude
conditions, and altimeter miss-sets. This ensures an optimal terrain display and alerting
capability.
•
EGPWS/TAWS Alerts and Anuciations
Mode Boundary Aural alert Visual
High barometric sinkrate
1.
Excessive Descent
Rate
Severe barmetric sinkrate
‘SINK RATE, SINK
RATE’
GPWS
Warning Light
2A.
Excessive closure to
terrain
Excessive RA descent
‘TERRAIN,
TERRAIN’
or
‘PULL UP’
GPWS
Warning Light
2B.
Excessive closure to
terrain in landing
configuration
RA descent in landing
configuration
‘TERRAIN,
TERRAIN’
or
‘PULL UP’
GPWS
Warning Light
3.
Altitude loss after
take-off or go-around
Excessive inertial altitude loss
‘DON’T SINK, DON’T
SINK’
GPWS
Warning Light
Airspeed < 178 kts and RA
below 500 ft
‘TOO LOW GEAR’
GPWS
Warning Light
4A.
Inadvertent proximity
to terrain with landing
gear not down
Airspeed < 178 kts and RA
below 1000 ft
‘TOO LOW
TERRAIN’
Airspeed < 148 kts and RA
below 200 ft
‘TOO LOW FLAPS’
GPWS
Warning Light
4B.
Inadvertent proximity
to terrain with flaps
not in landing
configuration
Airspeed < 148 kts and RA
below 1000 ft
‘TOO LOW
TERRAIN’
GPWS
Warning Light
4C.
Inadvertent proximity
to terrain
RA decrease during take-off
‘TOO LOW
TERRAIN’
GPWS
Warning Light
Below 1000 ft RA and deviation
in excess of 1.3 dots.
Below 150 ft RA deviation
threshold increases to 2 dots.
‘GLIDE SLOPE’
Soft alert
GS Warning
Light
5.
Excessive deviation
from the ILS glide
slope (BELOW)
Below 300 ft RA and deviation in
excess of 2 dots
‘GLIDE SLOPE’
Hard alert
GS Warning
Light
6.
Call-out during
approach for selected
DH
Descent below DH and RA
between 1000ft and 30 ft and
gear down.
‘MINIMUMS,
MINIMUMS’
Fokker 50 - Flight Navigation Instruments
Page 82