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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
Intentionally Left Blank
P/N 11934-S43 1 of 14
Cirrus Design Section 9
SR20 Supplements
Pilot’s Operating Handbook and
FAA Approved Airplane Flight Manual
Supplement
for
Cirrus Design SR20 Airplanes Registered in
Russia & Commonwealth of Independent
States (CIS) Countries
1. This supplement is required for operation of Cirrus Design SR20
airplanes, Aircraft Serial Numbers 1337 and subsequent equipped
with Primary and Multifunction Flight Displays when operated in
CIS Countries.
2. The supplement is to be attached and used in conjunction with
applicable SR20 FAA-Approved Airplane Flight Manual (AFM).
The information contained herein supplements or supersedes that
in the basic AFM and approved supplements only in those areas
indicated.
3. Compliance with the limitations contained in the basic AFM and
approved supplements is mandatory.
4. Foreign operating rules and any references to such rules in the
basic AFM and approved supplements are not applicable in the
CIS Countries.
5. The aircraft must be equipped and operated in accordance with
the applicable CIS Countries’ operating requirements. Refer to the
appropriate regulations for the operating rules and equipment
requirements that do pertain to operations in CIS Countries.
Original Issue: 01-20-09
2 of 14 P/N 11934-S43
Section 9 Cirrus Design
Supplements SR20
Section 1 - General
General Airspeed Terminology and Symbols
References in the basic AFM to the Operating Maneuvering Speed
(VO), may be interpreted as Maneuvering Speed (VA). In the context of
the data provided in the AFM, the velocity speeds VO and VA are
equivalent.
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