Altitude hold mode (alt), Automatic flight control system, Changing the altitude reference – Garmin G1000 King Air C90GT User Manual

Page 423

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190-00663-01 Rev. A

Garmin G1000 Pilot’s Guide for the Beechcraft C90A/GT

409

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

ALTITUDE HOLD MODE (ALT)

Altitude Hold Mode can be activated by pressing the ALT Key; the flight director maintains the current aircraft

altitude (to the nearest 10 feet) as the Altitude Reference. The flight director’s Altitude Reference, shown in the
AFCS Status Box, is independent of the Selected Altitude, displayed above the Altimeter. Altitude Hold Mode
active is indicated by a green ‘ALT’ annunciation in the AFCS Status Box.

Altitude Hold Mode is automatically armed when the flight director is in Selected Altitude Capture Mode (see

Figure 7-8). Selected Altitude Capture Mode automatically transitions to Altitude Hold Mode when the altitude
error is less than 50 feet. In this case, the Selected Altitude becomes the flight director’s Altitude Reference.

CHANGING THE ALTITUDE REFERENCE

NOTE:

Turning the ALT SEL Knob while in Altitude Hold Mode changes the Selected Altitude, but not the

flight director’s Altitude Reference, and does not cancel the mode.

With the CWS Button depressed, the aircraft can be hand-flown to a new Altitude Reference. When the

CWS Button is released at the desired altitude, the new altitude is established as the Altitude Reference.

Figure 7-9 Altitude Hold Mode

Selected

Altitude

Bug

Selected

Altitude

Altitude Hold

Mode Active

Altitude

Reference

Command Bars Hold Pitch Attitude

to Maintain Altitude Reference

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