9
3700 Osuna Road NE
Suite 711
Albuquerque, NM 87109
www.sandia.aero
2.6
Barometric Altitude
Baro Corrected Altitude is shown on the right side tape and drum. The altitude presented is
pressure altitude as measured on the static port, corrected by the currently set baro value.
Altitudes between -1,500 feet and 35,000 feet are displayable. If the aircrafts altitude exceeds
this range, the tape area will be Red-X’ed.
2.6.1
Baro Adjustment
Baro adjustment is performed by rotating the control knob left or right when no menu is selected
(default screen state). The value shown will be in the units that are configured during
installation. Units of inches mercury (inHg), and millibars (mb) are both supported. Baro
Correction from 28.00 inHg to 31.00 inHg, or 948 mb to 1050 mb can be set.
2.6.2
Default Baro
The default baro can be selected between Standard (STD), Automatically estimated (AUTO), or
last pilot set value (LAST).
•
STD will default to 29.92 InHg (or 1013 Mb).
•
AUTO will utilize the airport elevation on the last power-down to estimate a current
baro setting.
•
LAST will retain the last pilot entered value.
The default baro behavior adjustable to owner preference and can be configured by an approved
mechanic. This setting is not pilot adjustable.
2.7
Instantaneous Vertical Speed Indication (IVSI)
The IVSI is presented to the pilot using a growing and shrinking bar that gradually appears as
the magnitude of the vertical speed grows. The bar will not appear until the vertical rate excees
±100 Feet/Min. A digital value is also presented to the pilot. The IVSI in the SAI-340 uses both
the rate of altitude change and the internal accelerometer to provide vertical speed with very
little delay. The black area of the box is used for trimming vertical rate and the boundaries
represent ±50 ft/min. The tape itself does not appear until ±100 ft/min is exceeded.The IVSI can
be enabled or disabled during the installation configuration. The display filtering can be
adjusted in the installation configuration pages to slow down the responsiveness.
Figure 9 - Climbing and Descending IVSI
