- the thrust limit mode.
The FMGC computes the target thrust parameter and sends it to the ECU.
The ECU adjusts the actual engine thrust parameter according to this
value (Ref. 73-20-00).
The top limit value of the target thrust parameter is the actual position
of the throttle control lever (this is applicable when the alpha floor
protection is not activated).
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Thrust Setting Block Diagram
Figure 001
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E E Feb 01/98 E E ECES E THROTTLE CONTROL - DESCRIPTION AND OPERATION
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1. General_______ (Ref. Fig. 001) The throttle control system consist of :
- the throttle control lever
- the throttle control artificial feel unit
- the throttle control unit
- the electrical harness.
In addition each throttle control lever is fitted with an instinctive
pushbutton switch.
This pushbutton switch serves for the de-activation and disengagement of the
autothrust function.
The design of the throttle control is based upon a fixed throttle concept :
this means that the throttle control levers are not servo motorized.
2. Throttle Control Mechanical Parts_________________________________
A. Throttle Control Lever
(Ref. Fig. 002, 003)
The throttle control handle comprises :
- a throttle control lever which incorporates stop devices and autothrust instinctive disconnect pushbutton switch
- a graduated fixed sector
- a reverse latching lever.
The throttle control lever moves over a range from :
- -20 deg. TLA (Reverser Full Throttle stop) to 45 deg. TLA (Forward Full
Throttle stop). An intermediate mechanical stop is fitted at 0 deg. TLA. This stop is overriden when the reverse latching lever is pulled up for selection of the reverse power. This idle stop is reset as soon as the lever is selected back to forward thrust area. In the forward thrust area, there are two detent points :
- MAX CLIMB detent point set at 25 deg. TLA
- MAX CONTINUOUS/FLEX TAKE OFF detent point set at 35 deg. TLA. In the reverse thrust throttle range, there is one detent point : - -6 deg. TLA, this position corresponds to the selection of the thrust
reverser command and the Reverse Idle setting. From -20 deg. TLA to 0 deg. TLA, the autothrust function cannot be activated. In the middle throttle range (0 deg. to 35 deg. TLA), the autothrust function can be active if engaged. This range corresponds to the selection of MAX CLIMB or MAX CONTINUOUS thrust limit mode (except the FLEX TAKE OFF mode). If the autothrust is not engaged, the engine control is manual.
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Throttle Control Mechanical Parts
Figure 001
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Acquisition of the Throttle Control Discrete Signal by the FADEC
Figure 002
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Throttle Control System
Figure 003
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In the forward range (35 deg. to 45 deg. TLA), the autothrust function
cannot be activated (except in alpha floor condition).
This range corresponds to the selection of FLEX TAKE OFF/MAX TAKE OFF (GO
AROUND) mode.
The throttle control lever is linked to a mechanical rod. This rod drives
the input lever of the throttle control artificial feel unit.
B. Throttle Control Artificial Feel Unit (Ref. Fig. 004) The Throttle control artificial feel unit is located below the cockpit center pedestal. this artificial feel unit is connected to engine 1(2) throttle control lever and to the engine 1(2) throttle control unit by means of rods. The artificial feel unit is a friction system wich provides a load feedback to the throttle control lever. This artificial feel unit comprises two symetrical casings, one left and one right. Each casing contains an identical and independent mechanism. Each mechanism is composed of:
- a friction brake assembly
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