Stormscope Interface Check; Radar Altimeter Check (Arinc 429) - Garmin GI 275 Installation Manual

5. HSI: Navigate to the HSI Map page (turn the outer knob).
MFD: Navigate to the SXM Weather page (Menu → Select Page → Weather or turn the outer
knob).
6. Verify there are no warnings displayed.
7. MFD: Hold the knob to display the menu, then touch SXM WX Options, then Datalink Status.
a. Verify the Data ID field has a valid value and is not blank.
b. Verify the Data and Audio signal bars are in the green and that the displayed subscription level
is accurate.
6.3.6 WX-500 Stormscope Interface Check
This check is required for units intending to display Stormscope (lightning) on an MFD or MFD/Standby
ADI.
1. Power on the GI 275 in Normal mode.
2. Power on the LRU controlling the Stormscope.
3. Allow up to 5 minutes for the GPS navigator to obtain a position.
4. Navigate to the Lightning page (Menu → Select Page → Lightning or turn the outer knob).
5. Verify there are no warnings displayed.
6. Press the knob until the menu displays, then touch the Lightning Opts button.
7. Toggle between Cell and Strike modes and verify that the corresponding mode is displayed on the
bottom of the MFD.
8. Toggle between 360° and Arc views and verify the image switches between a 360° view
surrounding the aircraft icon to an arc placed in front of the aircraft icon.
6.3.7

Radar Altimeter Check (ARINC 429)

This check is required for units intending to display radar altitude on an MFD or MFD/Standby ADI.
NOTE
The GRA 55/5500 and FreeFlight RA4500 radar altimeters provide an automated self-test
during power cycles; therefore, no pilot-initiated self- test is required. After the power-up
sequence, verify that no faults are detected, "RA FAIL" is not displayed, and the RA value
displays "0" after the self-test is complete.
1. Power on the GI 275 in Normal mode.
2. Navigate to the Rad Alt page (Menu → Select Page → Rad Alt or turn the outer knob).
3. Initiate a radar test (Menu → Rad Alt Options → Test).
a. Verify that the radar altimeter increases to an altitude of 50 feet before decreasing to 0 feet.
190-02246-10
Rev. 11
GI 275 Part 23 AML STC Installation Manual
Page 6-14