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While Vertical Speed, Altitude Hold, Glideslope (GS), Glidepath (GP), or Selected
Altitude Capture mode is active, airspeed is monitored by the Flight Director.
Overspeed protection is provided in situations where the Flight Director cannot acquire
and maintain the mode reference for the selected vertical mode without exceeding the
maximum Helicopter Flight Control System airspeed. The maximum HFCS airspeed
is typically 5 knots below the current computed Vne as determined by altitude and
temperature.
CAUTION:
altitude and/or temperature. The GFC 600H does not adjust Vne based on
aircraft weight, configuration, or operation. It is the pilot's responsibility to
know the current applicable Vne for the rotorcraft and operate within the
Vne limit regardless of FCS mode of operation.
When the six second airspeed trend exceeds the maximum HFCS airspeed, the Flight
Director will deviate from the active vertical reference and produce a pitch up command
to prevent the rotorcraft from exceeding the current maximum HFCS airspeed, a visual
MAX SPEED annunciator will be displayed, a single aural MAX SPEED will be played,
and the previously active mode will become the armed mode.
Resolving an overspeed condition:
•
Reduce the collective.
•
Reduce the vertical mode reference using the cyclic trim switch or GMC 605
NOSE UP/DN wheel.
•
Change the engaged mode to ATT or IAS.
190-02081-04 Rev. A
The GFC 600H system computes the current Vne based on
GMC 605H Overspeed Indication
Garmin GFC 600H Pilot's Guide
HFCS
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