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Garmin GFC 600 Pilot’s Guide
190-01488-00 Rev. B
32
AFCS
ALTITUDE HOLD MODE (ALT)
Altitude Hold mode can be activated by pressing the
ALT
key; the AFCS maintains
the current aircraft altitude (to the nearest 10 feet) as the Altitude Reference.
With Garmin PFD:
Altitude Hold mode is automatically armed when in Selected Altitude Capture mode.
Selected Altitude Capture mode automatically transitions to Altitude Hold mode when
within 50 feet of the Selected Altitude. In this case, the Selected Altitude becomes
the Altitude Reference. The Altitude Reference is displayed on the GMC and the
autopilot will automatically compensate for small altitude changes introduced when
the altimeter setting is updated on the PFD.
When operating in Altitude Hold mode, the displayed altitude reference can be
adjusted by using the
NOSE UP/DN
wheel. The reference altitude can only be moved
a maximum of 150 ft from the current aircraft altitude; each click changes the reference
altitude by 10 ft. The altitude hold reference can also be adjusted by pressing the
CWS
button, hand-flying the aircraft to a different altitude, and then releasing the
CWS
button.
Without Garmin PFD:
When there is no Garmin PFD installed, the Altitude Reference is not displayed on
the GMC 605 and the autopilot cannot automatically compensate for small altitude
changes introduced when the altimeter setting is updated. The
NOSE UP/DN
wheel
may be used to adjust the Altitude Reference in increments of 10 ft per click up to +/-
150 ft from the current altitude.
When the wheel is moved the GMC will display the total adjustment the pilot has
selected. For example, clicking the wheel four times in the NOSE UP direction will
result in a display of ALT +40 FT. Three seconds after the last click, the adjustment
value will disappear and only ALT will be displayed. The autopilot will begin tracking
the new reference (in the example it would climb 40 feet). If the wheel is moved again
before the aircraft has reached the new reference altitude, the Altitude Reference will
synch to the current aircraft altitude and calculate a new adjustment from that altitude.
The altitude hold reference can also be adjusted by pressing the
CWS
button, hand-
flying the aircraft to a different altitude, and then releasing the
CWS
button.
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