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When the FCS is coupled in ALT, VS, GP, or GS modes and the rotorcraft is decelerating
to within six seconds of reaching a predetermined minimum airspeed (specified in the
AFMS):
• The LOW SPEED aural will sound every 15 seconds.
• A visual low speed annunciation is displayed.
• The active mode will change to IAS with a reference set to the minimum
engagement speed for Flight Director modes.
• The previously active mode will become the armed mode.
A LOW SPEED mode condition is resolved when the pitch attitude required to
maintain the previously active mode (ALT, VS, GS, or GP) is less than the pitch attitude
required to hold the IAS reference commanded by LOW SPEED mode.
Resolving a low speed condition:
•
Increase the collective sufficiently to allow the previously active mode to be
satisfied at a speed greater than the LOW SPEED commanded IAS value.
•
Use the cyclic trim switch or GMC 605 NOSE UP/DN wheel to reduce the
armed mode reference (decrease VS or ALT).
•
Change the FCS vertical mode to IAS or ATT.
•
Disengage the HFCS.
190-02081-04 Rev. A
GMC 605H Underspeed Protection
Garmin GFC 600H Pilot's Guide
HFCS
47
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