C. Automatic Tests These tests are built in order to detect failures which are not seen by the permanent monitoring. Generally these tests are allowed when the aircraft is on ground and not moving.
(1)
THS test
This test is performed by the ELACs and SECs in the following
conditions:
-the aircraft is on ground and not moving.
-3 hydraulic systems pressurized
-pitch attitude lower than 5 deg. The AIM of this test is to check the capability of each computer to control either the THS electrical motor power supply switching or the THS enable signal. In case of unsuccessful test a warning "ELAC PITCH FAULT" (when an ELAC is affected) or a CLASS2 message (when a SEC is affected) and a specific maintenance message are displayed. In addition the ground setting of the THS is normally ensured by the ELAC1 in order to check the availability of the ELAC1 THS control loop.
(2)
Aileron changeover test This test is made only by the ELACs. It is launched one time per flight in order to check that each ELAC is able to drive the aileron servocontrol mode (active or damped). The test is enabled when :
-the aircraft is on ground and not moving
-3 hydraulic pressures are available
-the elevators are at neutral and it is stopped as soon as one of these conditions disappears. If case of unsuccessful test a warning "AIL SERVO FAULT" and a maintenance message are displayed.
(3)
Elevator test
(a)
Mechanical disconnection monitoring This monitoring is ensured the by ELAC1 in order to check that its associated elevator servocontrols are not disconnected from the elevator. If there is a disconnection, the failure is detected during the check list and the warning "ELEV SERVO FAULT" and a maintenance message are displayed.
(b)
Elevator changeover test The conditions to launch this test are the same as for the aileron test. Each ELAC checks its capability to drive the mode of the elevator servocontrol. Any failure will induce the loss of pitch control in the affected ELAC and the loss of elevator control in the associated SEC (if the SEC is affected by the failure). This
1EFF : ALL 1 27-96-00Page 22 1 1 May 01/00R 1 1 1CES 1
failure will give the warning "ELAC PITCH FAULT" or "ELEV SERVO FAULT" and a maintenance message.
(4) Spoiler servovalve relay test The monitoring of the relay is made by the reading of the normally-closed contact status:
-
when hydraulic pressure is high, the relays are closed
-
when hydraulic pressure is low, the relays are open. If a discrepancy is detected, the affected SEC disconnects. This failure will give "SEC FAULT" warning.
MAINTENANCE AND SAFETY TESTS/BITE - ADJUSTMENT/TEST
___________________________________________________ TASK 27-96-00-710-001 Operational Test of the FCDC
1.
Reason for the Job
__________________
Self Explanatory
2.
Job Set-up Information
______________________
A. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
24-41-00-861-002 Energize the Aircraft Electrical Circuits from the External Power 24-41-00-862-002 De-energize the Aircraft Electrical Circuits Supplied
from the External Power 31-60-00-860-001 EIS Start Procedure 31-60-00-860-002 EIS Stop Procedure
3. Job Set-up
__________ Subtask 27-96-00-860-058
A. Aircraft Maintenance Configuration
(1)
Energize the aircraft electrical circuits (Ref. TASK 24-41-00-861-002).
(2)
On the overhead panel 23VU, make sure that:
-the FLT CTL/ELAC 1 and FLT CTL/SEC 1 pushbutton switches are pushed (on these pushbutton switches, the FAULT and OFF legends are off).
(3)
On the overhead panel 24VU, make sure that:
-the FLT CTL/ELAC 2, FLT CTL/SEC 2 and FLT CTL/SEC 3 pushbutton switches are pushed (on these pushbutton switches, the FAULT and OFF legends are off).
(4)
Do the EIS start procedure (Ref. TASK 31-60-00-860-001).
Subtask 27-96-00-865-055
B. Make sure that this(these) circuit breaker(s) is(are) closed:
R -------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------49VU FLIGHT CONTROLS/ELAC1/NORM/SPLY 15CE1 B11 49VU FLIGHT CONTROLS/FCDC1/SPLY 20CE1 B10 49VU FLIGHT CONTROLS/SEC1/NORM/SPLY 21CE1 B08 121VU PTR/SPLY 6TW J21 121VU CFDS/CFDIU/SPLY 2TW J18 121VU FLIGHT CONTROLS/FCDC2/SPLY 20CE2 Q20 121VU FLIGHT CONTROLS/SEC3/SPLY 21CE3 Q19 121VU FLIGHT CONTROLS/SEC2/SPLY 21CE2 Q18 121VU FLIGHT CONTROLS/ELAC2/NORM/SPLY 15CE2 R20
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