Ils Flight Check (Gtn 650); Autopilot Flight Check; Taws/Htaws Audio Flight Check (Taws/Htaws-Equipped Units Only); Database Check - Garmin GTN 625 Installation Manual

6.13.4

ILS Flight Check (GTN 650)

1. Tune an ILS at the local airport.
2. Verify the AUDIO IDENT and AUDIO QUALITY have no objectionable electrical interference
such as magneto noise.
3. Verify the Morse code decoder IDs the station (95% probability).
4. Fly the approach.
5. Verify NAV flag, GS flag, and CDI and VDI are operational.
6.13.5

Autopilot Flight Check

1. Enter and activate a flight plan on the GTN. For the GTN 650, ensure that GPS is selected on the
CDI. Engage the autopilot in the GPSS mode, if available. Verify that the autopilot flies the course.
2. Disengage the autopilot and fly off course. Re-engage the autopilot (in GPSS mode) and verify
that it correctly intercepts the course and continues to fly it.
3. Turn off the autopilot GPSS but leave the autopilot engaged in NAV mode. Verify that it maintains
the current course.
4. (GTN 650 Only): Reselect the GPSS mode on the autopilot. Press the CDI key on the display to
select VLOC on the GTN 650. Verify that the GPSS mode disengages.
5. For autopilots that provide vertical guidance, fly a vertically coupled LPV approach. Ensure the
autopilot correctly flies the approach.
6. Deviate from the glideslope by using control wheel steering, or by disengaging the autopilot.
Ensure the autopilot correctly follows the approach guidance once re-engaged.
6.13.6

TAWS/HTAWS Audio Flight Check (TAWS/HTAWS-equipped units only)

The TAWS/HTAWS volume needs to be loud enough to ensure that aural alerts are audible under all
anticipated noise environmental conditions. This check verifies that TAWS/HTAWS aurals can be heard
during flight, but the ambient noise conditions under which it is verified are not worst-case. Consequently,
the "Five Hundred" callout should be louder than is required for the conditions under which it is verified.
1. Set up for an approach to the airport.
2. During the approach, at approximately 500 ft AGL, the "Five Hundred" callout will occur. Verify
that "Five Hundred" can be easily heard and understood.

6.14 Database Check

Check the navigation database to ensure it is current. The database information is displayed during the unit
display start-up sequence. To check the database:
1. Turn off the GTN and then turn it on. The GTN will go through its normal start-up sequence.
2. Wait for the Navigation Database page to be displayed.
3. Verify that the expiration date displayed has not passed.
If the database has expired, then remove the SD card and update the navigation database as described in
Section 6.15. Also see Section 1.6.
190-01004-02
Rev. F
GTN 625/635/650 TSO Installation Manual
Page 6-71