ZENAIR CH2000 SERVICE MANUAL
_______________________________________________________________________
GYRO HORIZON INDICATOR
GENERAL
The gyro horizon is essentially an air driven gyroscope rotating in an horizontal plane and is operated by the
same principal as the directional gyro. Due to the gyroscopic inertia, the spin axis continues to point in the
vertical direction, providing a constant visual reference to the altitude of the airplane relative to pitch and
roll axis. A bar across the face of the indicator represents the horizon. A miniature adjustable airplane is
mounted to the case and aligning the miniature airplane to the horizon bar simulates the alignment of the
airplane to the actual horizon. Any deviation simulates the deviation of the airplane from the true horizon.
The gyro horizon is marked for different degrees of bank.
TROUBLESHOOTING See following table:
GYRO HORIZON INDICATOR
Trouble
Cause
Remedy
Bar fails to respond.
Insufficient vacuum.
Check pump and tubing.
Bar does not settle.
Excessive vibration.
Check shock mounts.
(Replace if necessary.)
Insufficient vacuum.
Defective instrument.
Check line and pump.
Adjust regulator.
Replace.
Bar oscillates or shimmies
continuously.
Excessive vibration.
Vacuum too high.
Defective mechanism.
Check shock mounts.
(Replace if necessary.)
Adjust regulator.
Replace instrument.
ELECTRIC TURN AND BANK INDICATOR
GENERAL
The turn and bank indicator is an electric instrument used for making correctly controlled turns. The turn
portion of the indicator is an electrically driven gyroscope, while the bank portion is a ball sealed in a curved
glass tube filled with damping fluid.
TROUBLESHOOTING
ELECTRIC TURN AND BANK INDICATOR
Trouble
Cause
Remedy
Pointer fails to respond.
Foreign matter lodged in
instrument.
Replace instrument.
Incorrect sensitivity.
Misadjustment of sensitivity
spring.
Adjust by means of sensitivity
spring screw. If this pulls the
pointer from zero, replace
instrument.
9.12
3 Apr 95
