Indicator-Specific Checks; Attitude And Direction Indicator (Adi) Checks - Garmin GI 275 Installation Manual

6.5 Indicator-Specific Checks

6.5.1

Attitude and Direction Indicator (ADI) Checks

The ADI Checkout Procedure, contained in the following subsections, must be conducted on each Primary
ADI and Standby ADI in the GI 275 system.
6.5.1.1 Pitot-Static and Airspeed Tape Settings Checks
The following section verifies the correct operation of the GI 275 altitude and airspeed tapes, standby
altimeter, and standby airspeed indicator using a pitot-static ramp tester. When using a pitot-static ramp
tester, only simulate normal aircraft operating conditions as defined in the aircraft Type Data (POH/AFM)
or other approved STC in order to avoid component damage.
NOTE
The ADC may require a warm-up period of 15 minutes to reach full accuracy; however,
30 minutes may be required if the environmental temperature is below 0º C.
The airspeed tape display and settings must be verified using Section 6.5.1.1.1 or Section 6.5.1.1.2
depending on the airspeed tape configuration (Basic or Advanced, respectively). The airspeeds referenced
in the following sections were configured per the instructions in Section 5.5.1.1.
6.5.1.1.1 Basic Airspeed Tape Setting
If the Airspeed Configuration Type is set to Basic, verify correct operation of the ADC as follows. The
Airspeed Configuration Type is set on the Airspeed Configuration page (Setup → Airframe
Configuration → Airspeed Configuration).
NOTE
If the ADC and standby airspeed indicator are on separate pitot-static systems, it is
recommended to set up the test set so that both systems can be tested at the same time, or
separate tests must be completed for each system.
1. Power on all GI 275s in the system in Normal mode.
2. Using a pitot-static test set, increase the airspeed until the airspeed tape pointer is at the bottom of
the white band (Vs0).
3. Verify that the bottom of the white arc/band on the standby ASI and ADI airspeed tape are at the
same airspeed value.
4. For twin-engine aircraft with a minimum control speed: Increase the airspeed to the lower red
radial (Vmca). Verify that the red radial on the standby ASI and ADI airspeed tape are at the same
airspeed value.
5. Change the airspeed until the ADI airspeed tape pointer is at the bottom of the green band (Vs1).
6. Verify that the bottom of the green arc/band on the standby ASI and ADI airspeed tape are at the
same airspeed value.
7. For twin-engine aircraft only: Increase the airspeed to the blue radial (Vyse). Verify that the blue
radial on the standby ASI and ADI airspeed tape are at the same airspeed value.
8. Change the airspeed until the ADI airspeed tape pointer is at the top of the white band (Vfe).
9. Verify that the top of the white arc/band on the standby ASI and ADI airspeed tape are at the same
airspeed value.
190-02246-10
Rev. 11
GI 275 Part 23 AML STC Installation Manual
Page 6-28