5-8
Abnormal Procedures
The following list generates a cyan L6 LSK advisory message:
Trimming Up
Trimming Down
The system has recognized that trim has
been running for an excessive duration.
In all cases, trim can be manually
overridden with pilot-controlled control
stick/yoke inputs. If the alert is present for
more than a few seconds, consider
disconnecting the autopilot, manually trim
the aircraft accordingly, and if autopilot
operations are still desired, re-engage the
autopilot in the desired mode.
AP/Nav Invalid
The system has recognized that the VHF
lateral nav signal is invalid. A Red-X will
cover the Horizontal Deviation Indicator
(HDI) on the ADI and the autopilot will
command a wind-corrected course hold
and, if sufficient power is available, the
flight path angle at the time the system
displayed the L6 Advisory message.
Consider switching the nav source in the
PFD page Primary Nav selection. If
unable to reacquire the nav signal, take
the proper action when a navigation
source has been lost. If on a published
approach that requires VHF-based lateral
guidance, the approach must be
terminated.
AP/GS Invalid
The system has recognized that the
vertical nav signal is invalid. A Red-X will
cover the Vertical Deviation Indicator
(VDI) on the ADI and the autopilot will
coast for 5 seconds and, if at the end of
that 5 second period, the signal has not
been reacquired, the autopilot will
transition to Alt Hold mode with all the
associated mode change indications.
Consider switching the nav source in the
PFD page Primary Nav selection. If
unable to reacquire the vertical nav
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