System Maintenance Manual

Page 6-4 G1000/GFC700 System Maintenance Manual – C90A/C90GT/C90GTi King Air
Revision F 190-00682-01
6.5 GTX 33 Transponder
Removal:
1. Gain access to the forward avionics compartment in the nose of the aircraft.
2. Unlock the GTX 33 handle by loosening the Phillips screw on the handle.
3. Pull the handle upward to unlock the GTX 33. Gently remove the unit from the rack.
Reinstallation:
1. Visually inspect the connectors to ensure there are no bent or damaged pins. Repair any
damage.
2. Gently insert the GTX 33 into its rack. The handle should engage the dogleg track.
3. Press down on the GTX 33 handle to lock the unit into the rack.
4. Lock the handle to the GTX 33 body using the Philips screw.
5. Configure and test the GTX 33 according to Section 7.5.
6.6 GDC 74B Air Data Computer
Removal:
1. Gain access by removing the appropriate GDU 1040A display unit (see Section 6.1.)
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.
Reinstallation:
1. Inspect the connector and pins for damage. Inspect the pitot/static plumbing for damage.
Repair any damage.
2. Place the unit in the mounting tray. Position the locking clamp and fasten using the
thumbscrews.
3. Connect the backshell assembly and pitot/static plumbing to the unit.
4. Configure and test the GDC 74B according to Section 7.6.
6.7 GTP 59 OAT Probe
Removal:
1. Using a deep-socket to hold the probe in place on the outside of the aircraft, loosen the GTP
59 mounting nut and remove the GTP 59.
Reinstallation:
1. Reinstallation is the reverse of removal.
2. No configuration is required for the GTP 59. Test according to Section 7.6.3.