Figure 6-5 Adi Standard Turn Rate Indicators - Garmin GI 275 Installation Manual

6. The following applies to Variable Vne/Vmo/Mmo aircraft only:
a. Decrease the IAS to 25 knots below the barber pole on the ADI. Increase the indicated altitude
to the maximum operating altitude or service ceiling. Verify that the red overspeed range on
the ADI and barber pole on the standby ASI are at the same airspeed (±5 knots). Decrease the
airspeed as needed to ensure the IAS does not exceed the overspeed range during the
simulated climb.
b. Decrease the indicated altitude (do not exceed vertical speed limitations) back to ambient
static pressure.
7. Starting at the current airspeed, decrease the airspeed to zero, stopping at all of the relevant
airspeeds listed in Table 6-5 (airspeeds above Vne should not be checked). Verify that the ADI and
standby ASI values are within the tolerances indicated.
6.5.1.1.3 Altimeter Check
The GI 275 and standby altitude displays must be verified per Title 14 of the CFR 91.411 and Part 43
Appendix E, with the following exception to 14 CFR Part 43 Appendix E, paragraph (b)(1):
• The tests of sub-paragraphs iv (Friction) and vi (Barometric Scale Error) are not applicable to the
GI 275 due to the ADC interface and instrument display being digital.
6.5.1.2 OAT Check
1. Power on all GI 275s in the system in Normal mode.
2. Use a pitot/static test set to increase the airspeed to 60 kts.
3. Verify that the standard turn rate indicators are displayed at the top of the page (refer to
Figure 6-5). If they are not displayed, then the ADI is not receiving outside air temperature data
from the GTP 59.
6.5.1.3 Synthetic Vision Check
Complete this section if SVT is enabled.
NOTE
It may take up to a minute for the synthetic terrain data to be displayed on the display.
Until SVT is active, the horizon display will be the standard blue over brown.
1. Power on the GI 275 in Normal mode.
2. Wait for the GI 275 to initialize (i.e., attitude, heading, airspeed, altitude, and GPS position
become valid).
3. On the display, navigate to the synthetic vision options (Menu → Options → Terrain SVT).
4. Toggle on Synthetic Terrain (i.e., illuminated green).
5. Verify that there are no SVT alerts.
6. Verify that synthetic terrain data is displayed on the display.
190-02246-10
Rev. 11

Figure 6-5 ADI Standard Turn Rate Indicators

GI 275 Part 23 AML STC Installation Manual
Page 6-30