Garmin Terrain Awareness/Warning System

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P/N 11934-S42 1 of 6
Cirrus Design Section 9
SR20 Supplements
Pilot’s Operating Handbook and
FAA Approved Airplane Flight Manual Supplement
for the
Garmin Terrain Awareness/Warning
System
When the Garmin Terrain Awareness/Warning System is installed on
the aircraft, this POH Supplement is applicable and must be inserted
in the Supplements Section (Section 9) of the Cirrus Design SR20
Pilot’s Operating Handbook. This document must be carried in the
airplane at all times. Information in this supplement adds to,
supersedes, or deletes information in the basic Pilot’s Operating
Handbook.
Original Issue: 12-18-08
2 of 6 P/N 11934-S42
Section 9 Cirrus Design
Supplements SR20
Section 1 - General
The airplane is equipped with the Garmin Terrain Awareness/Warning
System that performs the functions of a Class C Terrain Awareness
and Warning System (TAWS) in accordance with TSO C151b.
Refer to the Cirrus Perspective Integrated Flight Deck Pilot’s Guide for
a additional information on the system and its operating modes.
Section 2 - Limitations
1. The Cirrus Perspective by Garmin Integrated Avionics System
Pilot’s Guide for the SR20 and SR22, P/N 190-00820-02 Rev A or
later must be immediately available to the pilot during flight. The
software status stated in the pilot's guide must match that
displayed on the equipment.
2. Do not use Terrain Awareness and Warning System for navigation
of the aircraft. The TAWS is intended to serve as a situational
awareness tool only and may not provide the accuracy fidelity on
which to solely base terrain or obstacle avoidance maneuvering
decisions.
3. To avoid getting unwanted alerts, TAWS must be inhibited when
landing at an airport that is not included in the airport database.
• Note •
Only vertical maneuvers are recommended responses to
warnings and cautions unless operating in VMC or the pilot
determines, using all available information and instruments,
that a turn, in addition to the vertical escape maneuver, is the
safest course of action. During certain operations, warning
thresholds may be exceeded due to specific terrain or
operating procedures. During day VFR flight, these warnings
may be considered as cautionary.
Pilots are authorized to deviate from their current air traffic
control (ATC) clearance to the extent necessary to comply
with a TAWS warning.
Original Issue: 12-18-08
P/N 11934-S42 3 of 6
Cirrus Design Section 9
SR20 Supplements
Section 3 - Emergency Procedures
To prevent unwanted aural alerting during ditching or other off-airport
landings, inhibit the Terrain Awareness System functions by selecting
the INHIBIT Softkey on the TAWS Page.
Response To TAWS Warnings
Red PULL UP Warning
Aural “PULL UP” Warning
Aural “TERRAIN AHEAD” Warning
Aural “OBSTACLE AHEAD” Warning
1. Level the wings, simultaneously adding full power.
2. Increase pitch attitude to 15 degrees nose up.
3. Adjust pitch attitude to ensure terrain clearance while respecting
stall warning. If flaps are extended, retract flaps to the UP position.
4. Continue climb at best angle of climb speed (Vx) until terrain
clearance is assured.
Section 3A - Abnormal Procedures
Response To TAWS Cautions
Amber TERRAIN Caution
Aural “TERRAIN AHEAD” Caution
Aural “OBSTACLE AHEAD” Caution
Aural “CAUTION, TERRAIN” Caution
Aural “SINK RATE” Caution
Aural “DON’T SINK” Caution
Aural “TOO LOW, TERRAIN” Caution
1. Take positive corrective action until the alert ceases. Stop
descending, or initiate a climb turn as necessary, based on
analysis of all available instruments and information.
PULL UP
TERRAIN
Original Issue: 12-18-08
4 of 6 P/N 11934-S42
Section 9 Cirrus Design
Supplements SR20
Section 4 - Normal Procedures
Normal operating procedures are outlined in the Cirrus Perspective
Integrated Flight Deck Pilot’s Guide.
Alert Priority
When any of the TAWS aural alerts are in progress, all aural TRAFFIC
alerts are inhibited.
Advisory Callout
The advisory callout “FIVE HUNDRED”, occurs at approximately 500
feet AGL.
Section 5 - Performance
No Change.
Section 6 - Weight & Balance
No Change.
Section 7 - System Description
The Terrain Awareness/Warning System receives data from the GPS
receiver to determine horizontal position and altitude and compares
this information to the onboard terrain and obstacle databases to
calculate and “predict” the aircraft’s flight path in relation to the
surrounding terrain and obstacles. In this manner, TAWS provides
advanced alerts of predicted dangerous terrain conditions via aural
alerts communicated thru the pilot’s headset and color-coded terrain
annunciations displayed on the PFD.
Refer to the Cirrus Perspective Integrated Flight Deck Pilot’s Guide for
a additional information on the system and its operating modes.
Original Issue: 12-18-08
P/N 11934-S42 5 of 6
Cirrus Design Section 9
SR20 Supplements
System Constraints
System test at startup: Aural tone lasting approximately one second
indicates successful completion of internal system test.
Red TAWS FAIL Warning
Aural “TAWS SYSTEM FAILURE” Warning
1. TAWS power-up self-test has failed or TAWS has detected
problems with database validity, hardware status, and/or GPS
status.
White TAWS N/A Advisory
Aural “TAWS NOT AVAILABLE” Advisory
Should the 3-D GPS navigation solution become degraded or if the
aircraft is out of the database coverage area, the annunciation ‘TAWS
N/A’ is generated in the annunciation window and on the TAWS Page.
The aural message “TAWS NOT AVAILABLE” is generated. When the
GPS signal is re-established and the aircraft is within the database
coverage area, the aural message “TAWS AVAILABLE” is generated.
Geometric Altitude versus Measured Sea Level
TAWS uses information provided from the GPS receiver to provide a
horizontal position and altitude. This data serves as the reference for
color-coding for the TAWS Page and as an input to the TAWS Hazard
Avoidance algorithms. Because it is derived from GPS, Geometric
Altitude may differ from corrected barometric altitude. Therefore,
Geometric Altitude may be in error by as much as 100 ft and should
not be used for navigation.
TAWS FAIL
TAWS N/A
Original Issue: 12-18-08
6 of 6 P/N 11934-S42
Section 9 Cirrus Design
Supplements SR20
Original Issue: 12-18-08
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