Realization of the Engage or Disengage Logic
Figure 002
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E. Isolation of the Engines from the A/THR System (Ref. Fig. 003) The engine control is no longer dependent on the throttle control levers when the conditions below (elaborated by the FMGC and transmitted to the ECU) are met:
-
A/THR ENGD
-
A/THR ACT
-TARGET N1/EPR VALID
-throttle control lever in the area which authorizes the autothrust
control or Alpha floor protection active. Action on one of the two A/THR instinctive disconnect pushbutton switches or the disengagement of the A/THR function detected by the FMGCs on the command or monitoring channels forces the thrust control function of the throttle control lever position. This is done through the wired discretes that the ECU receives directly. This device permits to get rid of any failure downstream of the FMGC which might cause an untimely engagement of the A/THR function. At level of the A/THR engage logic performed by the FMGC, an action on one of the two A/THR instinctive disconnect pushbutton switches for more than 15 s. inhibits any engagement of the A/THR function, whatever the reason (A/THR pushbutton switch on the FCU, Alpha floor protection etc.) (Ref. Para. 2.B.). A similar protection is available at level of each ECU/EEC. Action on one of the two A/THR instinctive disconnect pushbutton switches for more than 15 s. inhibits operation of each ECU/EEC in autothrust control mode.
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Isolation of the Engines
Figure 003
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F. A/THR Warnings (Ref. Fig. 004)
(1) Presentation Upon disengagement of the A/THR and in certain flight phases, the FWCs elaborate the warnings below:
(a)
Illumination of the MASTER CAUT lights in amber on the glareshield.
(b)
Display of A/THR OFF amber message in the memo area of the upper display unit of the ECAM system when the disengagement is due to use of the instinctive disconnect pushbutton switch, display of AUTO FLT-A/THR OFF amber message in the warning area of the upper display unit of the ECAM system when the disengagement is not due to use of the instinctive disconnect pushbutton switch.
