Abnormal
Procedures
Overspeed Protection
If
the autopilot is engaged and the
aircraft attitude and engine power
settings are such that the aircraft
exceeds
V,,
,
overspeed protection
engages in the following manner:
1. At IAS
=
maximum stored speed
for each aircraft, the current engaged
vertical mode is disengaged.
2. IAS mode is automatically en-
gaged with
V,
as its reference
airspeed and the IAS annunciation
flashes for 10 seconds.
3.
The autopilot brings the nose up
to
decrease airspeed
to
the reference
airspeed determined above and holds
that airspeed.
Any mode can be engaged at this
point and the vertical command or
engine power should be reduced
to
prevent the reoccurance of overspeed
protection mode.
Autopilot “Dumps”
The KFC 400 monitors its perfor-
mance in many ways, a failure of any
one of these tests could cause the
autopilot and/or flight director to disen-
gage, or “Dump”. When this occurs a
flashing AP annunciation, aural tone,
and in most cases another annuncia-
tor
will
illuminate to give the crew
additional information regarding the
disengagement.
If
the KCP 420 has detected a
failure in one of the primary control
axes the AP Fail (or AP Disc. etc see
Flight Manual Supplement) annuncia-
tor
will
illuminate as well as the axis
failure
LED
on the KMC
440.
A trim
failure detected by the KCP 420 will
illuminate the Trim Fail annunciator on
the panel and the KAP 41
9.
Failures detected by the KAM 432
will illuminate both AP FAIL and TRIM
FAIL annunciators in the separate
panel annunciator. There are certain
attitude and attitude rate limits which
when exceeded will dump the
autopilot and after a slight delay the
fail annunciator
will
extinguish. The
autopilot may then be reengaged.
After a failure has been detected
the autopilot may be reengaged using
the.remaining functioning portions of
the system. See the flght manual
supplement for details on your aircraft.
If reengagement is not allowed by
the detected failure, the system may
be exersized using the self test
procedure to determine the systems
ability
to
function. A momentary failure
may
be
cleared in this manner. If self
test is not passed, the autopilot cannot
be used until repairs are accomp-
lished.
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