Piper ARCHER III, Руководство по эксплуатации для пилотов

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SECTION 7
DESCRIPTION & OPERATION PA-28-181, ARCHER IH
Multi-Function Display (continued)
Terrain Awareness and Warning System (TA WS -B) - Optional
NOTE
If
the G l0O0 system is configured to use the
optional Terrain Awareness and Warning System
(TA WS), Terrain Proximity will not be available
for use.
The Terrain Awareness and Warning System (TAWS-B) is an optional l"t:alllre
used to increase situational awareness and aid in reducing controlled flight into
terrain (CFiT). TA WS-B provides visual and aural cautions and warning alerts
when terrain and obstacles are within a given altitude threshold from the aircraft.
The displayed alerts and warnings are advisory in nature only. TA WS-B satisfies
TSO-C l 51 b Class B certification requirements whereas the more limited Ten-ain
Proximity docs not.
TA WS-B uses terrain and obstacle information supplied by government sources.
Terrain information is based on terrain elevation information in a database that
•
may contain inaccuracies. Individual obstructions may be shown if available in
• the database. The data undergoes verification by Garmin to confirm accuracy
of the content, per TSO-C 151 b standards, however, the displayed information
should never be understood as being all-inclusive and data may be inaccurate.
WireAware database coverage is mostly limited to tall transmission lines and
their associated support structures. It does not typically have information for
the smaller utility poles or lines. WireAware obstacle database coverage exists
mainly in the United States; with limited coverage in portions of Canada and
Mexico. The height of the wire obstacles is commonly estimated and should not
be relied upon for maneuvering decisions.
TA WS-B uses information provided from the GPS receiver to provide a horizontal
position and altitude. GPS altitude, derived from satellite measurements, is
converted to the height above geodetic sea level (GSL), which is the height
above mean sea level (MSL) calculated geometrically. GPS position and GSL
altitude is used to generate TA WS-B terrain and obstacle alerts. GSL altitude
accuracy is affected by satellite geometry, but is not subject to va r iat i on s in
pressure and temperature that normally affect pressure altitude sensors. GSL ,.
altitude does not require local altimeter settings to determine MSL altitude.
REPORT: VB-2749
7-26
ISSUED: December 22, 2017
REVISED: July 31, 2018