-
The engagement status of the FAC pushbutton switch
-
The status of the engaged AP signal for the automatic mode
-
The monitoring specific to the function: . Computation comparators . Power comparators
-
The global monitoring of the computer.
There are two modes of operation:
-
The manual mode
-
The automatic mode.
As the automatic mode has priority, the pilot trim is not possible in
AP-engaged configuration.
(2)
Manual mode As this mode is not under the control of the ADIRS, it remains available for the pilot trim part even in case of total failure of these peripherals. Specific operating logics are introduced:
(a) Control order This order operates if:
-
The normally closed position of a contact, and
-
The normally open position of the other contact are activated
simultaneously. If this is not the case the trim order is inhibited. This provides a means of avoiding contact failure or mechanical jamming.
(b) Reset order This order operates if:
-
The normally closed position of a contact, and
-
The normally open position of the other contact are activated
simultaneously. If this is not the case, the signal is not validated. This signal is processed as a pulse signal : even when no longer applied, the order is taken into account until its accomplishment on condition that the reset order has been validated. A priority logic is included between the command and the reset orders to avoid any possible jamming: 2 When a reset order is applied after a control order and even
1_ When a control order is applied after the introduction or the
non-accomplishment of a reset order, the control order has
priority.
_ if the latter is being executed, the reset order has priority.
(c) ELAC order (provision only) In case of loss of the roll normal mode from the ELAC, the accomplishment of the order by the rudder trim is interrupted.
(3)
Automatic mode
There is loss of the automatic mode:
-If the AP engaged signal is not validated
-Or if the status of the peripherals does not allow the achievement
of the function.
In addition to this loss:
-
The AP disconnects
-
The system returns to the manual mode without FAC disconnection. The AP also provides signals which validate the detection of engine failure as a function of the engine rating.
(4)
Warnings The loss of the rudder trim function is indicated on the display unit of the ECAM system:
-Loss of one channel:
RUD TRIM 1 or 2 amber warning
-Total loss:
RUD TRIM SYS amber warning + chime The RUD TRIM indication on the FLT CTL page of the ECAM system is flagged (2 crosses XX appear) if this item of information is not available.
D. Monitoring of the Rudder Trim Function (Ref. Fig. 005) The block diagram given below shows the organization of this function and the various types of monitoring which are integrated. These are:
-
Monitoring of ADCs on Vc parameter compared two by two (Ref. 22-65-00) This ensures the availability of the automatic function in the event of a single detected or undetected failure. The manual law is independent of the ADC function
-
Monitoring of the acquisitions of the ELAC and FMGC peripherals
R **ON A/C 001-049, 051-099, 101-149, 201-299,
-Limitation in amplitude (+ or - 20 deg. of rudder) and in speed (1 deg./s in manual control and approximately 1.7 deg./s in automatic control)
1EFF : ALL 1 22-62-00Page 10 1 1 May 01/05 1 1 1CES 1
Monitoring of Rudder Trim - Block Diagram Figure 005
1EFF : 1 1R 1CES ALL 1 11 1 22-62-00 Page 11 Feb 01/00
R **ON A/C 151-199, 401-499,
-Limitation in amplitude (+ or - 25 deg. of rudder) and in speed (1 deg./s in manual control and approximately 2.8 deg./s in automatic control)
**ON A/C 301-399,
-Limitation in amplitude (+ or - 20 deg. of rudder) and in speed (1 deg./s in manual control and approximately 1.8 deg./s in automatic control)
**ON A/C ALL
-Equalization of the monitoring channel on the command channel to reduce permanent deviations
-
Monitoring of the computation through a comparator between the command and the monitoring integrator (C1 comparator)
-
Monitoring of the power channel through C2 comparator between the deflection order and the position feedback
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