Installation Instructions

GTN 6XX/7XX AML STC Installation Manual 190-01007-A3
Page 5-108 Rev. 4
5.8.5 Autopilot Flight Check
1. Enter and activate a flight plan on the GTN. For the GTN 650/750, 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 650/750 Only): Reselect the GPSS mode on the autopilot. Touch the CDI key to select
VLOC on the GTN 650/750. 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.
5.8.6 TAWS Audio Flight Check (TAWS-equipped Units Only)
NOTE
The TAWS volume should be loud enough to ensure that aural alerts are audible
under all anticipated noise environmental conditions. This check verifies that TAWS
aurals can be heard during flight.
1. Take-off and ascend to altitude. During the ascent, in a high ambient noise condition with full
power, eject the SD card from the slot. A TAWS fail audio message should be generated.
2. Evaluate the volume of the audio message. Ensure the TAWS audio can be heard clearly and
intelligibly during high power, high noise flight. If the volume is too low, adjust as described in
Section 5.6.7.
3. After re-inserting the SD card into the slot, reboot the GTN by pulling the GTN circuit breaker
and pushing it back in.
4. After this test, during the approach, at approximately 500 ft AGL, the “Five Hundred” callout will
occur. Verify that “Five Hundred” can be easily heard and understood.
5.8.7 Marker Beacon Receiver Flight Check (GMA 35)
1. Set up for an approach to the airport, with the marker beacon set to low sensitivity.
2. During the approach, verify that the marker beacon annunciator light is illuminated for a ground
distance of 2000 to 3000 feet when flying at an altitude of 1000 ft AGL on the localizer centerline
in all flap and gear configurations.
An acceptable means to determine ground distances of 2000 to 3000 feet is to fly at a specified
groundspeed and time the duration that the marker beacon light is illuminated. The values listed in
Table 5-65 can be used.