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(e) Manual Thrust Setting
1 General
_ In manual thrust setting mode, power management COMMAND parameter is calculated as a function of throttle lever angle (TLA) as follows: Throttle control lever angle versus rated thrust relationship is as shown on Figure
R (Ref. Fig. 017) A forward action on the throttle control lever will not lead to a decrease in thrust. A rearward action on the throttle control lever will not lead to an increase in thrust. TLA versus rated thrust is consistent regardless of ambient conditions. TAKE-OFF/GO-AROUND ratings are always achieved at full forward throttle control lever position (except in Alpha-floor mode). Other ratings (MAX CONTINUOUS, MAX CLIMB, IDLE, MAX REVERSE) are achieved at constant throttle control lever positions. FLEXIBLE TAKE-OFF for a given derating is achieved at constant retarded throttle control lever position.
2 Thrust Limit mode selection
_ Throttle control lever is used as a rating mode selection device. Based on the throttle control lever position signal, FADEC computes thrust limit ratings, selects the corresponding limit value and sends it to the cockpit. Thrust limit mode selection is achieved by manually setting the throttle control lever to the corresponding unique position. (Ref. Fig. 014)
- MAX CLIMB rating on position 3
- MAX CONTINUOUS rating on position 2
- MAX TAKE-OFF/GO-AROUND rating on position 1 (MTO/GA) When the throttle control lever is positioned between two unique positions, the FADEC will select the limit of the higher mode for display
R (Ref. Fig. 018) When both throttle control lever positions select two different modes the rating limits sent by the two FADEC will be different. The AFS will take into account the highest one. On ground, as soon as the FADEC is powered ON (engine not running), the computed thrust limit parameter values related to the throttle control lever position is shown on the ECAM upper display unit (Including Flex Take-off Configuration). On ground, as soon as the engine is running, the computation of thrust limit parameter is initialized in MTO/GA mode.
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(FNA-TLA) Relationship
Figure 017
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N1 Limit and Limit Modes
Figure 018
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3 Flex take-off
_ On ground, if a Flex TO temperature has been set on the CDU of the FMS and has been validated (range, parity, SSM tests ...) and is higher than the static air temp., the FADEC Unit sets the MCT/FLEX TO detent point at the Flex TO (FTO) rating. When the engine is not running, the limit mode is a function of the throttle control lever position. When the conditions of the previous paragraph are met as soon as engine is running, the computation of the thrust limit parameter is initialized in Flex TO mode, as long as the throttle control lever is lower than or equal to MCT. When the engine is running, by setting the throttle control lever above MCL, the value of FLEX temperature is latched in the FADEC unit and the FLEX temperature value sent by the FMS is no longer considered in power management computations. In flight, the only way to cancel the FLEX TAKE-OFF rating and to reset the MCT/FTO position to MCT rating is to set the throttle control lever to less than or equal to MCL or equal to TO/GA. In flight, changing from the FLEX TAKE-OFF thrust limit mode to MCT limit mode is achieved by setting the throttle control lever in one of the two detent points - TO/GA or MCL - and by coming back to the MCT detent point. In flight, it is not possible to set back the MCT/FLEX TO detent point to FTO rating. When a FLEX TAKE-OFF is performed, MAX TAKE-OFF rating is achieved by pushing the throttle control lever to the full forward stop.
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