FLIGHT CONTROLS Flashcards
Flight Control Computers
2 ELACs
- Elevator Aileron Computers
3 SECs
- Spoiler Elevator Computers
2 FACs
- Flight Augmentation Computers
ELAC functions
- normal elevator
- normal aileron
- normal pitch and roll
- alternate pitch
- direct pitch and roll
- abnormal att
- aileron droop
- autopilot orders
SEC functions
- normal roll
- speed brakes
- alternate pitch
- direct pitch
- direct roll
- abnormal attitude
What does SEC 3 control
- Spoiler control - one flight spoiler and one ground spoiler on each wing.
FAC functions
- rudder trim
- rudder travel limit
- yaw control
Flight Envelope Protection
- Windshear Protection
- Low Energy Protection
- Alpha Floor Protection
- Characteristic PFD speeds
FCDC
- 2 Flight Control Data Concentrators
They aquire data from the ELACs and SECs and send it to the EIS and CFDS.
Normal Law protections
- High Speed
- High AOA
- Load Factor +2.5G / -1.0G clean (+2.0G / 0.0G with flaps/slats)
- Pitch 30° up / 15° dn
- Bank 67°
Alternate Law protections
- load factor
- high speed stability
- low speed stability
How is DIRECT LAW indicated on the PFD?
“USE MANUAL PITCH TRIM”
(in amber)
Amber Xs
(indicating lack of Normal Law protections)
How is MECHANICAL BACKUP indicated on the PFD?
“MAN PITCH TRIM ONLY”
(in red)
Amber Xs
(indicating lack of Normal Law protections)
DIRECT LAW protections
NONE
How are the flaps and slats affected if only GREEN hydraulic pressure is available?
Flaps and slats will still operate, but at half speed.
What prevents flap or slat asymmetry?
Wing Tip Brakes
If WTBs activate due to a flap asymmetry, how are the slats affected?
Slats can still operate normally, only flaps are inhibited.
What is ALPHA LOCK?
This function inhibits slat retraction from 1 to 0 with a high AOA and low airspeed.
