Eis Flight Checks; Standby Flight Checks; Autopilot Flight Checks - Garmin GI 275 Installation Manual

6.8.4

EIS Flight Checks

The following items (applicable to the installation) must be verified during flight:
• All gauges/markings clearly convey the respective engine parameters
• All EIS gauges are within their normal operating range
• No "Caution" or "Warning" indications are present
• Gauge indications are appropriate for all flight regimes
• Post-flight check of installed sensors and fittings for leaks
If the AFM/POH has an operating limitation based only on fuel flow, the fuel flow must be accurate within
10% to ensure the limitation is maintained. If the recorded fuel flow and measured fuel flow are out of
tolerance, the K-factor must be adjusted in Configuration mode. Perform the following:
1. Ensure the fuel lines are purged of air.
2. Record the displayed fuel flow and the measured fuel flow at the same engine settings.
• Example: Displayed value is 20 GPH, measured value is 24 GPH
3. Determine the offset ratio: Measured / Displayed.
• Example: Measured / Displayed = 24 / 20 = 1.2
4. Inverse the ratio.
• Example: 1 / 1.2 = 0.8333
5. Multiply the inverse by the currently used K-factor in Configuration mode.
• Example: Current K-factor 68000, adjusted K-factor is 68000 * 0.8333 = 56667
6. Enter the adjusted K-factor and reload the sensor.
6.8.5

Standby Flight Checks

Complete all checks in Section 6.8.1 and Section 6.8.3 for an MFD/Standby ADI. Complete all checks in
Section 6.8.1 and Section 6.8.2 for an HSI/Standby ADI.
6.8.6

Autopilot Flight Checks

NOTE
This section applies only to installations in which the GI 275 ADAHRS+AP interfaces to
an autopilot.
Once the configuration and ground checks are performed, the autopilot system must be flight tested and
adjusted for the particular airframe, if necessary. This section provides general guidelines for verifying the
autopilot, flight director performance, and any necessary adjustments.
Use the Autopilot Performance Checkout Log in Figure 6-7 to document the autopilot performance before
and after the installation of the GI 275.
If the autopilot performance does not adhere to the criteria listed in the Autopilot Performance Checkout
Log, the autopilot must be serviced in order to meet these criteria or customer acknowledgment of the
performance must be obtained prior to proceeding with the installation.
190-02246-10
Rev. 11
GI 275 Part 23 AML STC Installation Manual
Page 6-39