Gtp 59 Oat Probe; Grs 77 Or Grs 7800 Ahrs Or Gsu 75B Adahrs - Garmin G1000 Nxi System Maintenance Manual

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. Installation is the reverse of removal.
2. No configuration is required for the GTP 59. Test according to Section 7.7.5.

GRS 77 or GRS 7800 AHRS or GSU 75B ADAHRS

GRS 77 Removal:
1. Gain access to the forward avionics compartment in the nose of the aircraft.
2. Disconnect the AHRS connector.
3. Loosen the four Phillips thumbscrews with a screwdriver until they are free from the rack.
4. Gently lift the GRS 77 from the mounting rack. Do NOT loosen the remote rack
hardware fastening it to the avionics shelf or the GRS 77 must be re-calibrated per
Section 7.10.
GRS 77 Reinstallation:
1. Visually inspect the connectors to ensure there are no bent or damaged pins. Repair
any damage.
2. Place the GRS 77 on the mounting plate, ensuring the orientation is correct.
3. Use a #2 Phillips screwdriver to torque the GRS 77 mounting screws to the rack to 22-25
in-lbs.
4. Connect the connector to the GRS 77.
5. Calibrate and test the GRS 77 according to Section 7.10.
GRS 7800 Removal:
1. Gain access to the forward avionics compartment in the nose of the aircraft.
2. Disconnect the AHRS connector.
3. Pull back on the lockdown mechanisms and turn counterclockwise until free.
4. Disengage the lockdown mechanism collars from the GRS 7800 hooks and gently slide
the GRS 7800 from the mounting rack. Do NOT loosen the remote rack hardware
fastening it to the avionics shelf or the GRS 7800 must be re-calibrated per Section 7.10.
GRS 7800 Reinstallation:
1. Visually inspect the connector to ensure there are no bent or damaged pins. Repair any
damage.
2. Place the GRS 7800 on the mounting rack, ensuring the orientation is correct.
3. Slide the GRS 7800 back until the feet are fully engaged with the mounting rack.
4. Lift the lockdown mechanism collars in place on the GRS 7800 hooks and hand turn
lockdown mechanism knobs clockwise until the GRS 7800 is secure.
G1000 NXi System Maintenance Manual
King Air 300 Series
190-00716-N1
Page 233
Revision 1