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During climb, the Airspeed Reference units automatically change from IAS to Mach when either the altitude or the airspeed listed in Table 7-3 are attained. For descent, the units switch back at the specified altitude or airspeed. The system determines aircraft climb or descent by the relationship between the current and Selected altitudes.
Airspeed Reference Units
Unit Type Changes At:
Default Units
Change To:
Altitude
Airspeed
Climb
IAS
Mach
> 31,500 ft
> M 0.48
Descent
Mach
IAS
< 27,000 ft
< 249 kt
Table 7-3 FLC Mode Unit Changes
190-00494-02 Rev. B Garmin G1000 Pilot’s Guide for the Cessna Citation Mustang 377
Automatic utomatic utomatic Flight Control System ystem
SYSTEM
OVERVIEW
FLIGHT
INSTRUMENTS EICAS AUDIO PANEL
& CNS
FLIGHT
MANAGEMENT
HAZARD
AVOIDANCE AFCS ADDITIONAL
FEATURES APPENDICES INDEX
Airspeed Reference units can be manually toggled between IAS and Mach units using the SPD Key. When the FLC Airspeed Reference is displayed in Mach, the Airspeed Reference Bug is displayed on the Airspeed Indicator at the IAS corresponding to the selected Mach target speed and the current Mach number is shown below the Airspeed Indicator.
Figure 7-12 Flight Level Change Mode (Mach)Selected Altitude Capture Mode ArmedFlight Level Change Mode ActiveAirspeed Reference (Mach)CurrentMach NumberAirspeed ReferenceBugAirspeed ReferenceSelected AltitudeCommand Bars Indicate Climb toAttain Selected Altitude
378 Garmin G1000 Pilot’s Guide for the Cessna Citation Mustang 190-00494-02 Rev. B
Automatic utomatic utomatic Flight Control System ystem
SYSTEM
OVERVIEW
FLIGHT
AUDIO PANEL EICAS INSTRUMENTS
& CNS
FLIGHT
MANAGEMENT
HAZARD
ADDITIONAL AFCS AVOIDANCE
INDEX APPENDICES FEATURES
Vertical Navigationavigationavigation Modes (VPTH, ALTV) Noteote: VNV is disabled when parallel track or Dead Reckoning Mode is active. The Selected Altitude takes precedence over any other vertical constraints.
Vertical Navigation (VNV) flight control is available for enroute/terminal cruise and descent operations any time that VNV flight planning is available. Refer to the Flight Management Section for more information on VNV flight plans. Conditions for availability include, but are not limited to:
• The selected navigation source is GPS.
• A VNV flight plan (with at least one altitude-constrained waypoint) or direct-to (with vertical constraint) is active.
• VNV is enabled (VNV ENBL Softkey pressed on the MFD).
• Crosstrack error is valid and within certain limits.
• Desired/actual track are valid or track angle error is within certain limits.
• The VNV Target Altitude of the active waypoint is no more than 250 ft above the current aircraft altitude.
The flight director may be armed for VNV at any time, but no target altitudes are captured during a climb. The Command Bars provide vertical profile guidance based on specified altitudes (entered manually or loaded from the database) at waypoints in the active flight plan or direct-to (with vertical constraint). The appropriate VNV flight control modes are sequenced by the flight director to follow the path defined by the vertical profile. Upon reaching the last waypoint in the VNV flight plan, the flight director transitions to Altitude Hold Mode and cancels any armed VNV modes.
Verticalertical Pathath Trackingracking Mode (VPTH) Noteote: If another vertical mode key is pressed while Vertical Path Tracking Mode is selected, Vertical Path Tracking Mode reverts to armed. NOTE: Pressing the CWS Button while Vertical Path Tracking Mode is active does not cancel the mode. The autopilot guides the aircraft back to the descent path upon release of the CWS Button.
When a vertical profile (VNV flight plan) is active and the VNV Key is pressed, Vertical Path Tracking Mode is armed in preparation for descent path capture. ‘VPTH’ (or ‘/V’ when Glidepath or Glideslope Mode is concurrently armed) is annunciated in white in addition to previously armed modes. If applicable, the appropriate altitude capture mode is armed for capture of the next VNV Target Altitude (ALTV) or the Selected Altitude (ALTS), whichever is greater.
Figure 7-13 Vertical Path Tracking Armed Annunciations
190-00494-02 Rev. B Garmin G1000 Pilot’s Guide for the Cessna Citation Mustang 379
Automatic utomatic utomatic Flight Control System ystem
SYSTEM
OVERVIEW
FLIGHT
INSTRUMENTS EICAS AUDIO PANEL
& CNS
FLIGHT
MANAGEMENT
HAZARD
AVOIDANCE AFCS ADDITIONAL
FEATURES APPENDICES INDEX
Prior to descent path interception, the Selected Altitude must be set below the current aircraft altitude by at least 75 feet. For the flight director to transition from Altitude Hold to Vertical Path Tracking Mode, acknowledgment is required within five minutes of descent path interception by:
　
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