02-22-15
F2000EX EASY
PAGE 4 / 10
CODDE 1
ISSUE 3
ATA 22 – AUTO FLIGHT
SPEED PROTECTION MODE
DGT94085
DASSAULT AVIATION Proprietary Data
SPEED PROTECTION MODES WITH AUTOPILOT ON
AUTO-THROTTLE SPEED PROTECTION (ASP)
Engagement
The Auto-throttle Speed Protection (ASP) mode is automatically engaged each time the
airplane is flying outside of the normal speed flight envelope, when the AutoPilot is
engaged and the Auto-Throttle is not engaged:
-
low speed ASP is engaged when speed is below the amber Low Speed Cue (LSC)
top edge value,
-
high speed ASP is engaged when speed is above VMO / MMO.
WARNING
THERE IS NO AUTO-THROTTLE SPEED PROTECTION (ASP) MODE WHEN:
- IN TAKE-OFF (T/O), GO-AROUND (GA), AND WINDSHEAR (WS) MODES,
- FLYING MANUALLY WITHOUT ANY MODES ON THE FMA.
When the ASP is activated, the Auto-Throttle engages and adjusts engine power to follow
Thrust Director (TD) orders calculated by the system in order to maintain speed at the
upper edge value of the amber Low Speed Cue (LSC) or at VMO or MMO.
NOTE
When AT is engaged and in speed capture phase (target speed is significantly different from
the current speed), TD progressively coincide with acceleration chevrons.
After ASP activation, the reference speed for the Auto-Throttle mode is represented by a
magenta tear drop bug at the upper edge of the amber Low Speed Cue or at the lower
edge of the VMO / MMO cue. The Auto-Throttle mode is changed to protection mode and
a PROT indication will appear on the Flight Mode Annunciator (FMA). Thus, the ASP
controls the throttle positions to reach and maintain speed at the tear drop bug level. In
the example given below, the tear drop is superimposed with the speed bug set at VMO /
MMO.
NOTE
ERRONEOUS INDICATION:
PROT
indication (ASP) is cancelled by moving the throttles.
(ASP logic will be modified for the next certification).
