TROUBLESHOOTING
Unless an obvious malfunction (such as inability to erect, spinning, or great horizon bar displacement none
of which can be corrected by manually caging the instrument) requires repair or replacement of the gyro,
service is restricted to instrument installation and power source. Typical installation examples of artificial
horizon malfunctions are due to such problems as: restricted air flow due to air line kinks or leaks,
contaminated air filters, deteriorating electrical grounds, sagging instrument panel shock mounts, system
regulators, faulty vacuum/pressure gauges. (Air pressure must be 5.5 plus or minus 0.5 psig) Only after the
pneumatic system has proven to be good, should the instrument be pulled for replacement or repair.
DIRECTIONAL GYRO - AIR DRIVEN/ELECTRIC
GENERAL
Both air and electric directional gyros are used, depending on the option package installed. Both types are
displacement type gyros with FREE rotors mounted in gimbal assemblies. It is important that if a magnetic
slaving system, flight director, or autopilot is coupled to the directional gyro, the AFCS manufacturer's service
manual should be consulted.
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34 - 15 - 00
Page 34 - 09
Reissued: August 1, 1986
2D17
PIPER AIRCRAFT
PA-28-236
MAINTENANCE MANUAL
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