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Simrad AP26 and AP27 Autopilots
120 20221586B
Display readout Probable fault Recommended action
Rudder test failed Following conditions
may exist:
a) Rudder feedback
failure
b) Autopilot
Computer current
overload
c) Bypass/clutch
overload
Refer to recommended actions for
the specific probable faults.
Rudder moves in only
one direction
a) Poor connection to
one of the
solenoids
(continuously
running pump)
b) Faulty Power PCB
in autopilot
computer
a) Check the connections
b) Replace the Autopilot Computer
Power PCB
Rudder test not
completed within 2
min.
a) Poor connections
to the drive unit
b) Faulty Main PCB
in the Autopilot
Computer
c) Faulty Power PCB
in the Autopilot
Computer
a) Check connections
b) Replace the Main PCB
c) Check the Power PCB for traces
of burned transistors. – Change
Power PCB.
Rudder moves at full
speed to one side.
a) Faulty Power PCB
in Autopilot
Computer
Replace Autopilot Computer Power
PCB