Garmin G1000 NXi, Руководство пилота

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Garmin G1000 NXi Pilot’s Guide for the Cessna NAV III
190-02177-02 Rev. A 383
AUTOMATIC FLIGHT CONTROL SYSTEM
SY
STEM
O
VER
VIEW
FLIGHT
INSTRUMENTS
EIS
AUDIO P
ANEL
& CNS
FLIGHT
MANA
GEMENT
HAZARD
AV
OID
ANCE
AFCS
ADDITIONAL
FEA
TURES
APPENDICES
INDEX
Automatic Reversion to Pitch Hold Mode
Several situations can occur while Vertical Path Tracking Mode is active which cause the flight director
to revert to Pitch Hold Mode:
4
Vertical deviation exceeds 200 feet during an overspeed condition.
4
Vertical deviation experiences a discontinuity that both exceeds 200 feet in magnitude and results in
the vertical deviation exceeding 200 feet in magnitude. Such discontinuities are usually caused by
flight plan changes that affect the vertical profile.
4
Vertical deviation becomes invalid (the Vertical Deviation Indicator is removed from the PFD).
4
A display enters Reversionary Mode (this does not apply to an active vertical direct-to).
Unless VNV is disabled, Vertical Path Tracking Mode and the appropriate altitude capture mode become
armed following the reversion to Pitch Hold Mode to allow for possible profile recapture.
Non-Path Descents
Pitch Hold, Vertical Speed, and Flight Level Change modes can also be used to fly non-path descents
while VNV flight control is selected. If the VS or FLC Key is pressed while Vertical Path Tracking Mode is
selected, Vertical Path Tracking Mode reverts to armed along with the appropriate altitude capture mode
to allow profile re-capture.
Figure 7-17 Flight Level Change VNV Non-Path Descent
To prevent immediate profile re-capture, the following must be satisfied:
4
At least 10 seconds have passed since the non-path transition was initiated.
4
Vertical deviation from the profile has exceeded 250 feet, but is now less than 200 feet.
Pressing the VNV Key twice re-arms Vertical Path Tracking for immediate profile re-capture.
vnv t
arget
a
ltituDe
c
apture
M
oDe
(altv)
NOTE:
VNV Target Altitude Capture Mode is only applicable to aircraft equipped with a
VNV
Key.
NOTE: Armed VNV Target Altitude and Selected Altitude capture modes are mutually exclusive. However,
Selected Altitude Capture Mode is armed implicitly (not annunciated) whenever VNV Target Altitude Capture
Mode is armed.
VNV Target Altitude Capture is analogous to Selected Altitude Capture Mode and is armed automatically
after the VNV Key is pressed and the next VNV Target Altitude is to be intercepted before the Selected
Altitude. The annunciation ‘ALTV’ indicates the VNV Target Altitude is to be captured. VNV Target
Altitudes are shown in the active flight plan or vertical direct-to, and can be entered manually or loaded
from a database (see the Flight Management Section for details). At the same time as “TOD within 1
minute” is annunciated in the Navigation Status Box, the active VNV Target Altitude is displayed above the
Vertical Speed Indicator.