Review Questions - Flight Controls Flashcards
What does ELAC stand for?
Elevator Aileron Computer
How many ELACs are installed?
2
What are the functions of the ELAC?
a. Normal elevator and stabilizer control
b. Normal aileron control
c. Normal pitch and roll, Normal LAF
d. Alternate pitch, alternate LAF
e. Direct pitch and roll
f. Abnormal attitude
g. Aileron droop
h. Acquisition of autopilot orders
Under Normal Law, what does ELAC 1 control?
Primary - Aileron control (roll)
Standby - Elevator / Trimmable Horizontal Stabilizer control (backs up ELAC 2)
Under Normal Law, what does ELAC 2 control?
Primary - Elevator / Trimmable Horizontal Stabilizer
Standby - Aileron control (backs up ELAC 1)
What does SEC stand for?
Spoiler Elevator Computer
How many SECs are installed?
3
What functions are performed by the SECs?
a. Normal roll (by controlling the spoilers)
b. Speed brakes and ground spoilers (SEC 1 & 3 only)
c. Alternate pitch (SEC 1 & 2 only)
d. Direct pitch (SEC 1 & 2)
e. Direct roll
f. Abnormal LAF
g. Abnormal Attitude
Under Normal Law, what do the 3 SECs control?
Primary – Spoiler control (roll)
Standby – Elevator / Stabilizer control (SEC 1 & 2 back up the ELACs)
What is the sole purpose of SEC 3 in Normal Law?
Spoiler control
(Spoilers 1 & 2 only)
What is the definition of FAC?
Flight Augmentation Computer
How many FACs are installed?
2
What are the functions of the FACs?
a. Normal roll (turn coordination and yaw damping)
b. Rudder trim
c. Rudder travel limit
d. Alternate yaw
Is full rudder deflection available during all flight regimes?
No. Rudder deflection is limited as a function of airspeed
How are the flight control surfaces controlled and actuated?
All surfaces are electrically-controlled and hydraulically-actuated. The stabilizer and rudder can also be mechanically-controlled
When is automatic pitch trim available?
In flight under Normal law with bank angle less than 33° with or without autopilot engaged.
How is roll control normally achieved?
One wing tip aileron on each wing augmented by four spoilers on each wing
If the Rudder Travel Limit system fails, is maximum rudder deflection available?
Rudder deflection limit stops at the last value reached. When slats are extended, full rudder travel authority is resumed.
With only Green hydraulic system pressure available, will both the flaps and slats operate?
Yes, at 1/2 speed
What system prevents flap or slat asymmetry?
Wing Tip Brakes (WTB)
What causes the WTBs to activate?
ROAM
Runaway (Move handle to 1, all go to 3)
Overspeed (Flap jack screw breaks)
Asymmetry (Both on one side move farther)
Movement (Never touch handle, ALL just move)
If the WTB activates due to a flap asymmetry, can the slats still operate?
Yes, only flap operation is inhibited
How may Slat/Flap Control Computers (SFCC) are installed?
2
What would occur if one SFCC failed?
The slats and flaps would continue to operate, but at half speed
What flap/slat configurations correspond to position 1 on the FLAPS lever and how do they differ?
a. CONF 1+F is used for takeoff and provides both slats (position 1) + flaps
b. CONF 1 is used in-flight and is slats only
In what situation will the Flaps automatically retract?
During acceleration in CONF 1+F the FLAPS (not slats) will automatically retract to 0 at 210 knots
What is Alpha Lock?
This function inhibits slat retraction at high angles-of-attack and low speeds
What is indicated when the FLAP legend appears in cyan on the upper ECAM display?
Flaps/slats in transit