AeroNav 900/880 Series Pilot’s Guide
89000039-010
Rev 1 May 2019
Map Subsystem
4-37
TERRAIN ALERTING WARNING SYSTEM (TAWS)
NOTE
AeroNav TAWS Does Not Hold TSO C-151c
TSO C-151c functionality is all present in the AeroNav,
however, the AeroNav does not hold the TSO C-151c
approval and therefore may not take credit in aircraft
where TSO C-151c compliance is required.
The optional TAWS-B functionality does not require any external
equipment. For those aircraft equipped with TAWS-B, the function is
always running in the background and does not have a dedicated
display page. TAWS-B contains the following sub-functions:
Forward Looking Terrain Alerting (FLTA)
– includes
Reduced Required Terrain Clearance and Imminent Terrain
Impact alerts exactly as described above;
500’ Callout
– exactly as described above;
Premature Descent Alert (PDA)
– the PDA function uses
the aircraft’s current position and flight path information as
determined from the FMS/GPS and nav database to
determine if the airplane is hazardously below the normal
(typically 3 degree) approach path for the nearest runway;
Excessive Rates of Descent (EDR)
– this function is
designed to alert when excessive rates of descent are being
experienced during any phase of flight;
Negative Climb Rate (NCR) or Altitude Loss After
Takeoff/Go-Around
– this function is designed to alert when
the aircraft develops a negative climb rate immediately after
takeoff or go-around or when an altitude loss is detected in
that phase.
The aural alerts for the TAWS functions are listed below prioritized
from highest to lowest:
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