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Section 16. Autoflight
Eclipse 5OO Systems Manual
Copyright
© — Eclipse Aviation Corporation
Version 2.0 April 2007
419
Table 44. Overspeed Protection Based on Autopilot Engagement
Autopilot ENGAGED
Autopilot DISENGAGED
-If necessary will engaged SPD HOLD to
increase pitch and reduce speed
(elevator)
UNDERSPEED PROTECTION
If the aircraft nears a minimum speed of 1.15V
S
based on current aircraft
configuration (based on weight and CG), Underspeed protection (UPS) is activated.
The throttles are auto engaged and advanced such that airspeed is controlled at
1.15V
S
. A red SPD PROT appears in the speed portion of the flight mode
annunciation window. UPS is automatically disabled during approach and landing
and is manually disabled by pressing the ALL INTERRUPT switch on either sidestick.
It can be momentarily disabled for 30 seconds by pressing the A/T DISC button on
the left throttle. UPS function is based on whether or not the autopilot is engaged;
outlined below:
Table 45. Underspeed Protection Based on Autopilot Engagement
Autopilot ENGAGED
Autopilot DISENGAGED
Autothrottle-
-Automatically engages to control and limit
airspeed
Autothrottle-
-Automatically engages to control and limit
airspeed
Autopilot-
-Controls roll attitude to its state prior to the
Underspeed protection engagement (limited to
±15°)
-Holds the altitude prior to the Underspeed
engagement
Autopilot-
-Will NOT automatically engage, pilot must
manually control airspeed using pitch
(elevator)
Figure 288. Over and Underspeed Protection Flight Mode Annunciation
16.5.8 Stick Pusher
The ACS and the Autoflight System coordinate to provide stall protection. The ACS
analyzes the aircraft’s configuration, speed, and angle of attack to determine the
angle at which stall protection will become necessary. The autopilot pitch servo is
capable of providing the necessary elevator force to counter a nose-high pitch
attitude. Upon receiving the command to push, the Autoflight System disconnects the
autopilot and applies the equivalent 45 lbs of pitch-down force on the sidestick. The
pilot may override the pusher by pressing the All-Interrupt sidestick button or by
applying a force of about 40 lbs on the sidestick to allow the pitch trim clutch to slip.
16.5.9 Modes of Operation
TAKEOFF
Takeoff mode is a flight director only mode that is activated when the aircraft is on the
ground in a takeoff configuration with the TOGA switch pressed. Both flight director
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