Gtp 59 Oat Probe; Grs 77 Or Grs 7800 Ahrs - Garmin G1000 System Maintenance Manual

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. Installation is the reverse of removal.
No configuration is required for the GTP 59. Test according to Section 7.6.3.
2.
6.8

GRS 77 or GRS 7800 AHRS

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. (If the mounting rack is removed, the GRS 77
must be re-calibrated. Do not loosen mounting bolts. See Section 7.7)
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. Fasten the unit to the plate using the Phillips thumbscrews.
4. Connect the connector to the GRS 77.
5. Calibrate and test the GRS 77 according to Section 7.7.
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 simultaneously 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. (If the mounting rack is removed, the GRS 7800 must be re-
calibrated. Do not loosen mounting bolts. See Section 7.7)
GRS 7800 Reinstallation:
1. Visually inspect the connectors 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.
5. Connect the connector to the GRS 7800.
6. Calibrate and test the GRS 7800 according to Section 7.7.
G1000 / GFC 700 System Maintenance Manual - 300/B300 Series King Air
190-00716-01
Page 6-5
Revision 4