Robinsons R66 - Special Maintenance and Inspections

22-62 Special Maintenance and Inspections
A. Troubleshooting
CAUTION
Adjustment to autopilot equipment is not permitted.
PROBLEM ACTION
Control panel lights do not illuminate or
flash when master switch is turned on.
Verify computer is getting power.
Return computer to RHC.
System does not enter standby-mode
(lights flash continuously).
Verify attitude indicator bank angle less
than 6 degrees.
Verify attitude indicator output between
13 and 14 pins is less than 0.3 volts at
connector.
Check wiring between attitude indicator
and computer.
Contact RHC Technical Support.
SAS does not engage when TRIM button
depressed for longer than 1.25 seconds;
pressing TRIM button does not reset
reference attitude; pressing TRIM button
does not reset reference altitude in
altitude hold.
Check wiring between TRIM button and
computer.
Verify integrity of TRIM button.
Return computer to RHC.
SAS does not disengage when cyclic grip
AP OFF button depressed.
Check wiring between AP OFF button and
computer.
Verify integrity of AP OFF button.
Return computer to RHC.
SAS does not engage or disengage when
control panel buttons pressed.
Engage and/or disengage SAS using cyclic
grip buttons. If system responds properly,
failure is in control panel or associated
wiring to computer.
Contact RHC Technical Support.
SAS does not hold pitch attitude, but
holds roll attitude or vice versa.
Check servo-to-cyclic linkage.
Check wiring between faulty servo and
computer.
Return faulty servo and computer to RHC.
SAS disengages unintentionally
(accompanied by four beeps in headset).
Contact RHC Technical Support.
Autopilot mode disengages
unintentionally, and reverts to SAS mode
(accompanied by single beep in headset).
Determine if navigation signal may have
gone invalid due to operational reason.
Check wiring between appropriate
instrument/avionics and computer.
Check instrument/avionics for failure flags
(steady and intermittent).
Page 22.10 Chapter 22 Autopilot MAY 2015