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HFCS
Due to the inherent nature of helicopter primary control design, a cyclic control
system absent of a force trim or retention spring poses a potential safety concern if the
FCS disengages/disconnects while the pilot's hands are not on the controls. The effect
of an unattended disconnect is dependent upon the airframe, however the design of
the GFS 83 (-11) servo is capable of mitigating this concern such that this failure is
fail-passive.
LEVEL MODE (LVL)
Level mode is a sub-mode of ATT and is annunciated as both the vertical and lateral
modes when active. Pressing the LVL key engages the Helicopter Flight Control
System (if the Helicopter Flight Control System is disengaged) in level vertical and
lateral modes. Any active lateral or vertical flight director modes are cancelled. Level
mode does not track altitude or heading but instead uses a aircraft-configurable
pitch attitude intended to maintain steady flight under most conditions and a lateral
reference of zero bank angle. The aural alert "Leveling" will sound upon engagement.
To exit Level Mode the following actions may be taken:
• Use the cyclic trim switch to change the pitch or roll attitude reference.
• Activate a Flight Director mode.
• Disengage the FCS.
Level Mode may be helpful if the rotorcraft is inadvertently flown
NOTE:
into IMC conditions.
gmc 605h A
The GMC 605H annunciates 'LVL' in both the vertical and lateral sections.
22
nnunciAtions
GMC 605H Annunciating Level Mode
Garmin GFC 600H Pilot's Guide
190-02081-04 Rev. A
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