DOC AIRBUS | AMM A320FSPOILER - DESCRIPTION AND OPERATION
** ON A/C NOT FOR ALL
1. General
Five spoilers numbered 1 thru 5 inboard to outboard are provided on the rear upper surface of each wing.
The spoilers are used for:
- Roll function
- Speedbrake function
- Ground spoilers function
Each spoiler is electrically controled (Ref 27-90) and Hydraulically actuated by an electrohydraulic servocontrol (Ref 27-64).
They are two type of servocontrol with different overall dimensions (Ref 27-64):
- The inboard type for spoilers 1,2 and 3.
- The outboard type for spoilers 4 and 5.
Three Spoiler Elevator Computer (SEC) (Ref 27-94) elaborate the surface deflection order.
The spoilers 1 and 2 are associated with SEC 3.
The spoilers 3 and 4 are associated with SEC 1.
The spoiler 5 is associated with SEC 2.
Each SEC is organized around two channel:
- Command channel
- Monitor channel
The Command channel receives analog sensor data,Arinc data and discrete signals in order to generate the flight commands used to drive the correspondant servo control.
The Monitor channel receives independently the sensor information required to compute the control law.
Each SEC is also connected to two Flight Concentrator Data Computer (FCDC) (Ref 27-95).
The FCDC serves as an interface between the SEC's and; Display System and Warning (EIS Ref 31-60,FWC Ref 31-53),Maintenance System (CFDS Ref 31-30), Recording System (FDIU,DFDR,QAR Ref 31-33).
The position of all spoilers and other surface are indicated on the lower ECAM Display Unit (Ref 31-64) via the FCDC.
** ON A/C NOT FOR ALL Five spoilers numbered 1 thru 5 inboard to outboard are provided on the rear upper surface of each wing.
The spoilers are used for:
- Roll function
- Speedbrake function
- Ground spoilers function
Each spoiler is electrically controled (Ref 27-90) and Hydraulically actuated by an electrohydraulic servocontrol (Ref 27-64).
They are two type of servocontrol with different overall dimensions (Ref 27-64):
- The inboard type for spoilers 1,2 and 3.
- The outboard type for spoilers 4 and 5.
Three Spoiler Elevator Computer (SEC) (Ref 27-94) elaborate the surface deflection order.
The spoilers 1 and 2 are associated with SEC 3.
The spoilers 3 and 4 are associated with SEC 1.
The spoiler 5 is associated with SEC 2.
Each SEC is organized around two channel:
- Command channel
- Monitor channel
The Command channel receives analog sensor data,Arinc data and discrete signals in order to generate the flight commands used to drive the correspondant servo control.
The Monitor channel receives independently the sensor information required to compute the control law.
Each SEC is also connected to two Flight Concentrator Data Computer (FCDC) (Ref 27-95).
The FCDC serves as an interface between the SEC's and; Display System and Warning (EIS Ref 31-60,FWC Ref 31-53),Maintenance System (CFDS Ref 31-30), Recording System (FDIU,DFDR,QAR Ref 31-33).
The position of all spoilers and other surface are indicated on the lower ECAM Display Unit (Ref 31-64) via the FCDC.
2. System Description
A. Roll Function
(Law ref 27-90, Spoilers Slaving and Monitoring Ref 27-94)
The spoilers 2 thru 5 assist the ailerons in roll control.
The Roll axis is controlled and monitored by the three SEC's associated with ailerons.
The SEC's compute the surface deflection orders:
In manual control mode, mainly from the side sticks (Ref 27-92)
In autopilot mode from the FMGS (Ref 22-10).
(Law ref 27-90, Spoilers Slaving and Monitoring Ref 27-94)
The spoilers 2 thru 5 assist the ailerons in roll control.
The Roll axis is controlled and monitored by the three SEC's associated with ailerons.
The SEC's compute the surface deflection orders:
In manual control mode, mainly from the side sticks (Ref 27-92)
In autopilot mode from the FMGS (Ref 22-10).
B. Speedbrake Function
(Law Ref 27-90, Spoilers Slaving and Monitoring Ref 27-94)
The speedbrake function is controlled and monitored by the three SEC's with spoilers 2, 3 and 4.
The speedbrake lever controls the position of these spoilers and so is used for the preselection of ground spoilers function.
(Law Ref 27-90, Spoilers Slaving and Monitoring Ref 27-94)
Speedbrake Function - Block DiagramThe speedbrake function is controlled and monitored by the three SEC's with spoilers 2, 3 and 4.
The speedbrake lever controls the position of these spoilers and so is used for the preselection of ground spoilers function.
(1) The speedbrake lever positions and the equivalent angles are given in the following table:
| ------------------------------------------------------------------------------- |
| ! LEVER POSITION ! SPEEDBRAKE ANGLE (deg) ! |
| !----------------------------------!------------------------------------------! |
| ! ARMED ! -3 ! |
| ! RET ! 0 ! |
| ! 1/2 ! +28.5 ! |
| ! FULL ! +57 ! |
| ------------------------------------------------------------------------------- |
C. Ground Spoilers
(Law Ref 27-90, Spoilers Slaving and Monitoring Ref 27-94)
The ground spoilers function is ensured by all spoilers.
The activation of this function is dependent upon:
- The function preselection (given by speedbrake lever position)
- The two engines at idle
- Flight/Ground transition (With Ground and wheel speed information).
(Law Ref 27-90, Spoilers Slaving and Monitoring Ref 27-94)
The ground spoilers function is ensured by all spoilers.
The activation of this function is dependent upon:
- The function preselection (given by speedbrake lever position)
- The two engines at idle
- Flight/Ground transition (With Ground and wheel speed information).