Garmin Cirrus Perspective SR20 Pilot's Manual page 408

HAZARD AVOIDANCE
PDA and FLTA aural and visual alerts can be manually inhibited. Discretion should be used when inhibiting
TAWS-B and the system should be enabled when appropriate. When TAWS-B is inhibited, the alert
annunciation 'TAWS INH' is shown on the PFD and MFD (Figure 6-117).
Inhibiting/enabling TAWS-B alerting:
1) Select the TAWS-B Page.
2) Press the INHIBIT Softkey to inhibit or enable TAWS-B (choice dependent on current state).
Or :
a) Press the MENU Key.
b) Select 'Inhibit TAWS' or 'Enable TAWS' (choice dependent on current state) and press the ENT Key.
If TAWS-B alerts are inhibited when the Final Approach Fix is the active waypoint in a GPS SBAS approach,
a 'LOW ALT' annunciation may appear on the PFD next to the Altimeter if the current aircraft altitude is at
least 164 feet below the prescribed altitude at the Final Approach Fix. See the Flight Instruments Section for
details.
FIVE-HUNDRED AURAL ALERT
The purpose of the aural alert message "Five-hundred" is to provide an advisory alert of when the aircraft
descends to within 500 feet above the terrain or runway threshold. When the aircraft is within 5 nm of an
airport, the "Five Hundred" aural alert is based on the nearest runway threshold elevation. When the aircraft
is more than 5 nm of the nearest airport, the "Five Hundred" aural alert is based on the height above terrain
as determined using the GSL altitude and terrain database.
NEGATIVE CLIMB RATE AFTER TAKEOFF ALERT (NCR)
The Negative Climb Rate (NCR) After Takeoff alert (also referred to as "Altitude Loss After Takeoff")
provides alerts when the system determines the aircraft is losing altitude (closing upon terrain) after takeoff.
The aural message "Don't Sink" is given for NCR alerts, accompanied by an annunciation and a pop-up terrain
alert on the display. NCR alerting is only active when departing from an airport and when the following
conditions are met:
• Height above the terrain is less than 700 feet
• Distance from the departure airport is 5 nm or less
• Heading change from the departure heading is less than 110 degrees
Figures 6-82 and 6-83 shows the NCR alerting parameters as defined by TSO-C151b based on Altitude
Loss and Sink Rate respectively.
Cirrus Perspective
394
Figure 6-117 TAWS-B Alerting Disabled
(TAWS-B Inhibited) Annunciation
by Garmin – Pilot's Guide for the SR20/SR22SR22T
™
190-00820-08 Rev. A