AMD 601XL / 601XLI / 650LS / 650LSi SLSA MAINTENANCE MANUAL
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DIRECTIONAL GYRO INDICATOR - ELECTRIC - OPTIONAL
GENERAL
The directional gyro is a flight instrument incorporating an gyro stabilized in the vertical
plane. The gyro is rotated at high speed. Due to gyroscopic inertia, the spin axis
continues to point in the same direction even though the aircraft yaws to the right or left.
This relative motion between the gyro and the instrument case is shown on the instrument
dial which is similar to a compass card. The dial, when set to agree with the airplane
magnetic compass provides a positive indication free from swing and turning error.
TROUBLESHOOTING
DIRECTIONAL GYRO INDICATOR
Trouble
Cause
Remedy
Indicator 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.
Not working
No power to indicator
Check wires / fuse / power
Replace instrument.
Incorrect reading that cannot be
corrected.
Defective mechanism.
Replace instrument.
ATTITUDE GYRO INDICATOR
-
OPTIONAL
GENERAL
The attitude gyro is essentially a 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.
9.8
July 09
