Bedienungsanleitung Garmin GTN 650 (Seite 90 von 412) (Englisch)

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GTN 6XX/7XX AML STC Installation Manual 190-01007-A3

Page 3-10 Rev. 4

3.4 GTN/GMA 35 Location and Mounting

3.4.1 GTN Rack Installation

Use the dimensions shown in Figure A-4 (GTN 6XX) or Figure A-6 (GTN 7XX) to prepare the mounting

holes for the GTN 6XX or GTN 7XX unit. The GTN 6XX or GTN 7XX unit mounting rack itself may

also be used as a template for drilling the mounting holes.

1. The backplate of the rack may optionally be removed for ease of mounting in the aircraft panel.

To do so, remove the two #4-40 screws, tilt the backplate away from the tray, and then slide the

backplate to the side.

2. Figure A-9 shows outline dimensions for the aviation rack for the various GTN units. Install the

rack in a rectangular 6.320” x 4.600” hole (or gap between units) in the instrument panel (See

Figure A-10). The lower-front lip of the rack should be flush with, or extend slightly beyond, the

face of aircraft instrument panel.

NOTE

If the front lip of the mounting rack is behind the surface of the aircraft panel, the GTN

unit connectors may not fully engage.

3. Make sure that no screw heads or other obstructions prevent the unit from fully engaging in the

rack (see Section 5.3). Exercise caution when installing the rack into the instrument panel.

Deformation of the rack may make it difficult to install and remove the GTN.

4. Install the rack in the aircraft panel using six #6-32 flat head screws and six self-locking nuts. The

screws are inserted from the inside through the holes in the sides of the rack. Torque screws 12-

15 in-lbs.

5. Verify GTN/GMA rack is electrically bonded to aircraft structure or instrument panel as required

in Section 2.4.5.

6. If the backplate was previously removed (see Step 1), replace the backplate by positioning the

tabs on the backplate in the slots of the left side of the rack (viewing it from the cockpit) and

attaching it by replacing the two #4-40 screws. Torque 5 to 6 in-lbs.

3.4.2 GTN Unit Insertion and Removal

It may be necessary to insert the hex drive tool into the access hole and rotate the cam mechanism 90°

counterclockwise to ensure correct position prior to placing the unit in the rack. The GTN is installed in

the rack by sliding it straight in until it stops, about 1 inch short of the final position. A 3/32-inch hex

drive tool is then inserted into the access hole at the bottom of the unit face. Rotate the hex tool clockwise

while pressing on the left side of the bezel until the unit is firmly seated in the rack.

To remove the unit from the rack, insert the hex drive tool into the access hole on the unit face and rotate

counterclockwise until the unit is forced out about 3/8 inches and can be freely pulled from the rack.

Be sure not to over-tighten the unit into the rack. The application of hex drive tool torque exceeding

15 in-lbs can damage the locking mechanism.

NOTE

After installing a GTN unit, verify that the unit power-up self-test sequence is

successfully completed and no failure messages or configuration error messages are

annunciated. Section 5.7.1 outlines the power-up self-test sequence.

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