Electronics Rack - Location of Computers
Figure 002
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Autothrust System - Block Diagram
Figure 003
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Thrust Setting
Figure 004
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Throttle Definition
Figure 005
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2 Each ECU/EEC (one per engine) associates a thrust (N1/EPR CMD)
_ with the position of the corresponding throttle control lever.
(b) Selection of the limit thrust modes
1 Principle
_ The selection of the limit thrust modes (CL, MCT, FLX TO, TO/GA) is made when the throttle control levers are placed in one of the gates (or stops) below:
-CL (gate)
-MCT/FLX TO (gate)
-TO/GA (stop).
When the throttle control levers are between two positions,
the limit thrust mode selected is the one which corresponds to
the most advanced position.
2 Initialization on the ground
_ On the ground, with engines stopped, the computation of the limit thrust is initialized on the mode which corresponds to the position of the throttle control levers. On the ground, with engines running, the computation of the limit thrust is made in the TO/GA mode.
3 Specific case of FLX TO mode - FLX TO/MCT switching
_ As the gates for the FLX TO/MCT modes correspond to a same position, a specific logic has been adopted for the selection of these modes:
-On the ground If a fictitious temperature (FLX TO temperature) higher than the TAT is entered on the MCDU (TAKEOFF page), the limit thrust computation is made in FLX TO mode. The fictitious temperature is shown on the ECAM display unit together with the engine parameters as long as the FLX TO mode is engaged. For safety reasons, the fictitious temperature is frozen at takeoff as soon as a throttle control lever reaches the CL position.
-In flight The FLX TO-to-MCT switching is made when the throttle control levers are moved from the FLX TO/MCT position to another position (TO/GA or CL) and returned to the FLX TO/MCT position.
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(2)
Autothrust control In this mode, the thrust is computed by the autothrust (A/THR) system. The A/THR function engaged can be:
(a)
Active Two cases are considered:
(b)
Not active As soon as one throttle control lever is placed outside the IDLE-MCT zone, the two engines are controlled by the position of the throttle control levers. This lasts as long as the Alpha floor protection is not activated and if at least one throttle control lever stays beyond the IDLE-MCT zone.
(3)
Memothrust control In this mode, the thrust is frozen at the loss of the autothrust control. Upon the disengagement of the A/THR function (which occurs in its active phase), the thrust is frozen for the engines on which the associated throttle control lever is in the CL or MCT gate.
1_ Case 1 : Alpha floor protection inactive:
With the two throttle control levers between IDLE and CL, the
engines are controlled by the A/THR function. However, the
ECU/EEC limits the control of each engine to a max. rate
depending on the position of the throttle control lever.
NOTE : When the A/THR function is engaged, the normal position____
of the throttle control levers is the CL gate
(two-engine operation) or the MCT gate (in the event of
an engine failure).
The throttle control levers shall be positioned outside
the gates only if the pilot wishes to limit the max.
thrust.
2_ Case 2 : Alpha floor protection active
The A/THR-controlled thrust is equal to the TO/GA thrust for
any control lever position.
For safety reasons, each ECU/EEC gives a low limit to the
controlled thrust, according to the rate which corresponds to
the position of the throttle control lever.
NOTE : If a throttle control lever is not in one of the CL or MCT
____ gates, there is a return to the manual thrust control on the corresponding engine.
1EFF : ALL 1 22-30-00Page 10 1 1 Feb 01/98 1 1 1CES 1 The controlled thrust of each engine becomes again dependent on the position of the throttle control lever as soon as the associated lever is outside the CL or MCT gates.
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