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Anti-Ice Bleed Effect Figure 012
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R R Reverser Switches Figure 013
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The maximum reverse rating power is automatically controlled by the ECU versus all ambient conditions, with a unique maximum reverse throttle position. In normal operation, ECU sets the engine at idle as long as the reverser is in transit. When the thrust reverser is fully deployed on ground or fully stowed, N1 follows throttle demand.
(2) Thrust Setting
(a) General Two thrust setting mode are available, the autothrust mode and the manual mode. The mode selection is depending on throttles levers position and upon the autothrust activation/deactivation logic. Throttles move over a sector divided in three areas where autothrust System (ATHR) can be activated or not: (Ref. Fig. 014)
- In the rear region (from 5 up to and excluding 4) ATS cannot be activated.
- In the middle region (from and including 4 up to and including 2) ATS can be activated.
- In the forward region (from 2 to 1) ATS cannot be activated.
TAKE-OFF and FLEX TAKE-OFF is performed manually.
The thrust setting general arrangement is given on.
(Ref. Fig. 015)
(b) ATHR activation/deactivation
R (Ref. Fig. 016) The autothrust function (ATHR) can be engaged or active. The engagement logic is done in the FMGC and the activation logic is implemented into the ECU. The activation logic in the ECU unit is based upon two digital discretes ATHR engaged, ATHR active, from the FMGC, plus an analog discrete from the instinctive disconnect pushbutton on the throttle. The ATHR function is engaged automatically in the FMGC by auto pilot mode demand and manually by action on the ATHR pushbutton switch located on the flight control unit (FCU). The ATHR de-activation and ATHR disengagement are achieved by action on the disconnect pushbutton switch located on the throttle control levers or by pressing the ATHR pushbutton switch provided that the ATHR was engaged, or by selection of the reverse thrust.
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Throttle Lever Definition Figure 014
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Thrust Setting General Organization Figure 015
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INTENTIONALLY BLANK
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E E May 01/05 E E ECES E F 『 E C F M E E E E 56-5B E F 『 E C F M E E E E 56-5B E If the Alpha Floor condition is not present, setting at least one throttle control lever forward of the MCT gate leads to ATHR deactivation but maintains ATHR engaged ; the thrust is controlled by the throttle control lever position and ATHR will be activated again as soon as both throttle control levers are set at or below MCT gate. If the Alpha Floor condition is present, the ATHR function can be activated regardless of throttle control lever position. When ATHR is deactivated (FMGC command or failure), the thrust is frozen to the actual value at the time of the deactivation. The thrust will be tied to the throttle control lever position as soon as the throttle control levers have been set out of the MCT or MCL positions. The ATHR is active if: TLA < MCT (or TLA = MCT and FLEXTO mode not selected) or Alpha Floor condition and
ATHR Activation/Deactivation Figure 016 (SHEET 1)
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ATHR Activation/Deactivation Figure 016 (SHEET 2)
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- FCU discretes set to 1
- ATHR active = 1
- ATHR engaged = 1
- Deactivation condition is not present.
(c) ATHR deactivation
1 When the ATHR function is deactived, it may lead either to
_ freeze the thrust to the N1 actual (memo mode) or to recover the manual thrust (manual mode) as shown on figure
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