AFMS N°D07 FOR GARMIN GFC700 AUTOPILOT AND VARIABLE PITCH PROPELLER EQUIPPED
AEROPLANES
Section 1 – General-
AUTOPILOT FUNCTIONS
angle is increased, a region of an increasing force as a function of bank angle is entered. The
envelope protection system adds bank stability in this region. As the bank angle is increased
further, a constant force is applied to right the airplane.
See the below figure for an example of the ESP engagement limits.
VMO
Exceeding VMO will result in ESP applying force to raise the nose; when the high speed condi-
tion is remedied, ESP force is no longer applied.
Engage Limit: 165 KIAS
Upper Limit: 168 KIAS
Lower disengage Limit: 160 KIAS
13.2 USP
Underspeed Protection (USP) is a flight director function that reacts to underspeed condi-
tions, designed to discourage aircraft operation below minimum established airspeeds.
Pilot will be warned of impending low speed conditions, and if no action will be taken FD
will directly react in a way that allows the A/P to remain engaged but prevents the air-
plane from stalling.
USP function has been developed in order to warn pilot of impending
low speed conditions, and if no action will be taken FD will directly
react in a way that allows the Autopilot to remain engaged but pre-
vents the airplane from stalling.
Pilot action is still expected at first warning of low airspeed conditions
in order to prevent a low speed conditions, so to maintain normal
flight.
When autopilot is engaged USP will provide the pilot with au-
ral/visual cues to make him aware of an impending stall and will
drive the servos in order to prevent stall.
When autopilot is not engaged and only Flight director is active, USP
will provide the pilot with aural/visual cues to make him aware of an
impending stall but servos will not be driven.
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