Aircraft Technical Manual
J120, J160, J170, J200/J400, J230/J430, J250/J450 Variants
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Tachometer inaccurate /
fluctuating
Wrong number of pulses set in
tachometer setup
Correct settings per
manufacturer’s instructions.
No resistor between display and
alternator – some displays only
Some displays require a resistor
be installed between the display
and the alternator. Check
manufacturer’s installation
instructions and ensure resistor
is fitted where required.
Connection between GPS and
display failed
Check and repair connection
Settings on Display or GPS
incorrect
Check settings and correct to
match manufacturer’s
recommendations.
11.10 Magnetic Compass (all J-Series)
The Magnetic Compass is liquid-filled, with expansion provisions to compensate for temperature
changes. It is equipped with compensating magnets adjustable from the front of the case. No
maintenance is required on the compass except an occasional check on a compass rose for
adjustment and compensation.
11.11 Gyro Instrument Package (Option) (all J-Series)
A vacuum pump driven Artificial Horizon and Directional Gyro, together with an electric Turn
Coordinator, is available as an option.
Where this option is provided, a different instrument panel fascia is fitted.
Repair should only be performed by an approved instrument workshop.
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