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Secondary Flight Control System
Consists of:
- horizontal stabiliser (FBW)
- flaps and slats (FBW)
- multi-function spoilers (when used as speedbrakes or ground spoilers) (FBW)
- dedicated ground spoilers (FBW)
Horizontal stabiliser
Driven through the FCM, HS-ACE, and HSA. Failure of the system disengages the AP. During an electrical emergency, only channel 2 of the HS-ACE and HSA is available, and the horizontal stabiliser works at a slow rate. Direct mode operation is also at a slow rate.
High lift system
There are 4 slats and 2 double-slotted flaps on each wing. Slat and flap motion is sequenced so that slats extend first, and flaps retract first. Deployment is through 2 SF-ACEs, and electrically operated through 2 PDUs (a slat PDU and a flap PDU). There are 2 actuators per flap panel, and 2 per slat panel. Failure of a single channel in an SF-ACE or a single electric motor failure in a PDU results in low rate speed operation of the system. If there is a double channel failure, the system is no longer available. In an electrical emergency, low speed operation only is available. With the RAT deployed, flap/slat position 3 is the maximum available to ensure adequate airspeed for the RAT.
| Slat/Flap Control Lever | Slat Position (°) | Flap Position (°) |
| 0 | 0 | 0 |
| 1 | 15 | 5 (E170) 7 (E190) |
| 2 | 15 | 10 |
| 3 | 15 | 20 |
| 4 (gate) | 25 | 20 |
| 5 | 25 | 20 |
| Full | 25 | 35 (E170) 37 (E190) |
Position 4 is used only for takeoff, and position 5 only for landing.
Spoiler control system
There are 2 inboard dedicated ground spoilers (L1, L2 and R1, R2) which deploy after landing. Panels are fully stowed or fully deployed (60°). If opened 6° or more a takeoff config warning can be generated. With WOW, TLA idle, and wheel speed >45kts or airspeed >60kts, multi-function spoilers and ground spoilers are commanded open. When wheel speed <45kts or the thrust levers are >35° TLA, the spoilers retract automatically.
Direct mode
Ground spoilers are not available.