Honeywell BENDIX/KING KAP 140 Maintenance Manual page 57

ITEM
Pitch Clutch Engaged
Power Up Fail
PFT Fail
Revision 2, Dec/2002
CS:15574F02
BENDIX/KING
KAP 140
DESCRIPTION
Indicates engagement status of pitch clutch solenoid
based on sensing current flow through the low side
solenoid driver in the FCC. The detection threshold
is set at 120mA with a hysteresis of 30mA. A 'YES'
implies solenoid current was greater than the
detection threshold and therefore the pitch clutched
is engaged. A 'NO' implies solenoid current is less
than the detection threshold and therefore the pitch
clutch is not engaged.
Internal discrete which reflects the result of the built
in self--test of the core functions of the FCC when
power is first
microcontroller, read--only and random access
memory, and watchdog timer. A 'YES' indicates the
power--up test has failed. A 'NO' indicates the test
has passed.
Internal discrete which reflects the result of the built
in self test of primary functions of the flight control
system when power is first applied. A 'YES' indicates
that one or more pre--flight test steps has failed. A
'NO' indicates all tests passed. PFT failures inhibit
one or more of the following functions: trim (autotrim
and MET), autopilot (pitch and roll), or pitch modes
(allowing roll operation).
applied. This includes the
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