-
The RTL specific logic. This logic validates the associated power channel according to the considered side.
(2) Return to low speed logic (Ref. Fig. 004) This logic controls the motor in emergency mode when the normal control is not possible (FAC or motor electronic failure). It controls a relay inside the rudder travel-limitation unit. This relay switches the motor on a supply independent from the power electronic set of the limitation unit. This supply is delivered from the 26VAC busbar through the circuit breaker 14CC1(2). The switching relay is activated upon slat extension:
-In case of dual failure of the rudder travel-limitation function, and
-During a fixed time corresponding to the acquisition of the maximum
stop. The signal C (+28VDC = return to low speed order) energizes the switching relay inside the unit. The FAC provides the relay ground (signal M) from the monitoring side. The logic is identical for both sides.
D. Monitoring of Rudder Travel-Limiting Function (Ref. Fig. 005) This function has three types of monitoring.
(1)
Monitoring of acquisition
The VC parameters from the ADIRS are monitored by a two-by-two
comparison (Ref. 22-65-00).
(2)
Monitoring of computation After amplitude and speed limiting, the C and M computation orders are compared (C and M duplicated C1 comparators). Activation of this monitoring function causes the loss of the rudder travel limiting function on the considered side.
(3)
Power monitoring Two position transducers are used for slaving and monitoring. This monitoring is based on:
Return to Low Speed Logic Figure 004
1EFF : 1 1R 1CES ALL 1 11 1 22-61-00 Page 10 May 01/04
Monitoring of Rudder Travel-Limiting Function Figure 005
1EFF : 1 1R 1CES ALL 1 11 1 22-61-00 Page 11 May 01/04
-The monitoring of the acquisition of the transducer (cut wire, short circuits, variation of the power supply voltage)
-A comparator C2 between the order and the rudder feedback on the
sides C and M. Activation of these monitoring functions causes the loss of the rudder travel-limiting function on the considered side.
(4) Warnings The loss of the rudder travel-limiting function is indicated by the warnings given below:
(a)
Loss of a rudder travel-limiting channel The amber message: AUTO FLT RUD TRV LIM 1(2) appears on the upper display unit of the ECAM system.
(b)
Loss of two rudder travel-limiting channels The amber message: AUTO FLT RUD TRV LIM SYS appears on the upper display unit of the ECAM system and the single chime sounds. After action on the CLR pushbutton switch on the ECAM control panel this message appears: SYSTEM INOP : RUD TRV LIM.
R **ON A/C 106-149, 301-399, 401-499,
The RTL indication on the FLT CTL page of the ECAM system is flagged (amber indexes) if this information is not available.
**ON A/C ALL
6. Test Procedure
______________
A. Test of Rudder Travel-Limitation Unit A test procedure is initiated at FAC energization to check the integrity of the standby channel. This procedure permits to check:
-The triggering capability of the internal monitoring of the rudder travel-limitation unit
1EFF : ALL 1 22-61-00Page 12 1 1 Aug 01/05 1 1 1CES 1 -The slaving of the rudder travel-limitation unit without motion of the
rudder.
The test sequence is as follows:
(1)
Monitoring triggered at fault status The enable order is not sent : the motor order is fed back on the test circuit of the rudder travel-limitation unit. A null order lower than the programmed threshold is sent and the monitoring must be triggered (open circuit to the FAC).
(2)
Monitoring triggered at good status The enable order is not sent. The rudder travel-limitation unit receives a slaving order (equal to half of the travel) and the monitoring must return to good status (ground to the FAC).
(3)
Test of slaving The enable order is sent as well as a null order. The stage of the switching relay of the enable order must be tested. The monitoring must be forced to the good status.
B. Test of Return to Low Speed Function The test of the return to low speed function is not automatic. It can be performed on the ground by maintenance personnel in the conditions given below:
-FAC 1 and FAC 2 pushbutton switches set to OFF
-Slats extended.
C. Test of Cutoff Relays The test of the RTL SYS1 and SYS2 relays 13CC1 and 13CC2 (cutoff of the 28 V of the rudder travel-limitation unit) is performed automatically during these tests (capability to open).
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