Instruction Manual

Page 7-20 G1000 / GFC 700 System Maintenance Manual - 200/B200 Series King Air
Revision 9 190-00915-01
7.7.2 Procedure A1: GRS 77 or GRS 7800 Pitch/Roll Offset Calibration
This procedure must be performed for both GRS units installed in the aircraft. This first procedure must
be carried out with the engine off.
1. Level the aircraft to within ±0.25° of zero pitch and zero roll using a digital level. (Follow
instructions in King Air 200 Series Maintenance Manual, listed in Table 1-2, for leveling)
2. Start PFD #1 in Configuration mode.
3. Go to the GRS Page Group and select the GRS/GMU Calibration page at the PFD. This page is
protected and the following softkey password must be entered at the PFD to continue:
• 9
• 10
• 11
• 12 (Far Right softkey)
4. Ensure that the No. 1 GRS is selected in the SELECT GRS UNIT window on the PFD.
5. Activate the cursor and highlight the SELECT PROCEDURE window and select PITCH/ROLL
OFFSET.
6. Press the ENT key.
7. Use the cursor to highlight the BEFORE CALIBRATION window.
8. Follow the checklist items displayed on the PFD and press the ENT key as each step is completed or
confirmed.
9. When the CALIBRATE field is blinking, press the ENT button to begin the procedure.
10. After several seconds, a new checklist appears in the lower half of the PFD. Press the ENT key as
each step is confirmed. When the CONFIRM AIRCRAFT IS LEVEL field is blinking, press the
ENT key to continue.
11. The result of the pitch/roll offset compensation is displayed on the PFD. If successful, the AHRS
records the required pitch and roll offsets, informs the operator of a successful conclusion and
returns to normal operation.
12. Press the ENT key on the PFD to conclude this procedure for GRS #1.
13. Repeat steps 1 through 13 for GRS #2 with PFD #2.