Gtx 33 Transponder; Gdc 74A Air Data Computer; Gtp 59 Oat Probe - Garmin Diamond DA 40 Maintenance Manual

6.5

GTX 33 Transponder

Removal:
Remove the baggage compartment floor and compartment to gain access to the remote
1.
avionics enclosure.
Unlock the GTX 33 handle by loosening the Phillips screw on the handle.
2.
Pull the handle upward to unlock the GTX 33. Gently remove the unit from the rack.
3.
Replacement:
Visually inspect the connectors using a flashlight to ensure there are no bent or damaged pins.
1.
Repair any damage.
Gently insert the GTX 33 into its rack. The handle should engage the dogleg track.
2.
Press down on the GTX 33 hand to lock the unit into the rack.
3.
Lock the handle to the GTX 33 body using the Philips screw.
4.
Configure and test the GTX 33 according to Section 7.5.
5.
6.6

GDC 74A Air Data Computer

Removal:
1. Gain access to the space behind the instrument panel by removing the panel cover.
2. Disconnect the pitot/static plumbing from the rear of the unit. Disconnect the single
connector.
3. Loosen each thumbscrew on the hold-down clamp and remove the clamp.
4. Carefully remove the unit from its mount.
Replacement:
1. Place the unit in the mounting tray.
2. Position the locking clamp and fasten using the thumbscrews.
3. Connect the pitot/static plumbing.
4. Inspect the connector and pins for damage. Repair any damage. Connect the connector to
the unit.
5. Configure and test the GDC 74A according to Section 7.6.
6.7

GTP 59 OAT Probe

Removal:
1. Remove the co-pilot seat per the DA 40 Aircraft Maintenance Manual.
2. Use a deep-socket to hold the probe in place on the outside of the aircraft. Inside the cockpit,
loosen the GTP 59 mounting nut and remove the GTP 59.
Replacement:
1. Replacement is the reverse of removal.
2. No configuration is required for the GTP 59. Test according to Section 7.6.
Page 6-4
Revision 6
G1000/DA40 System Maintenance Manual
190-00303-03