Flight Controls Flashcards
What are the secondary flight controls
- Horizontal stabilizer
- flaps/slats
- multifunction spoiler (when used as speed brakes or ground spoilers)
- dedicated ground spoilers
What are the primary flight controls
- Ailerons and multifunction roll spoilers
- elevators
- rudder
How are the ailerons commanded
Conventional control cables from the control column to the PCUs
Which control surfaces are fly-by-wire
- elevators
- rudders
- roll spoilers
- horizontal stab
- flaps/slats
- ground spoilers
- speed brakes
What are included in the primary control electronics
Primary Actuator Control Electronics (P-ACE)
Flight Control Modules (FCM)
The FBW system is made up of how many Actuator Control Electronics
9
The FBW system is made up of how many FCMs
4
What is an FCM
Flight Control Module
What are the slat degrees available
0, 15, or 25
15 for lever position 1-3
25 for lever position 4-full
What are the slat, flap degrees for each position selected
0: 0, 0 deg
1: 15, 5 deg
2: 15, 10 deg
3: 15, 20 deg
4: 25, 20 deg
5: 25, 20 deg
Full: 25, 35 deg
What do the ACEs do
They connect the control column electronically to the respective control surface
How many P-ACEs are there and what do they control
3, rudder and elevator surfaces
How many SF-ACEs are there and what do they control
There are 2 SF-ACEs and they control the slats and flaps surface
How many channeled do the SF-ACEs have and what are they for
2, one for flaps, one for slats
How many channeled do the P-ACEs have and what are they for
2, one active, one standby
How many channeles do the HS-ACEs have and what are they for
2, one active, one standby
How many HS-ACEs are there and what do they control
1, it controls the horizontal stabilizer surface
How many S-ACEs are there and what do they control
3, located within the FCMs, they control the multifunction spoilers
What is DIRECT mode
The FCM is removed from the control loop and control limits default to values set by hardware in the P-ACE. Don’t roll input is sent directly from pilots to the control surface
What let’s the P-ACE units and FCMs communicate
The Controller Area Network Bus (CAN BUS)
How long does a Power Up Built In Test (PBIT) last before it expires
50 hrs (elapsed time)
What does the electrical PBIT look for
Out-of-tolerance conditions and failures in the FCMs, P-ACEs, and SF-ACEs
When is the electrical PBIT performed and how
Automatically during power up after the plane has AC power. It takes approx 3 mins.
What must be done if the FLT CTRL BIT EXPIRED message is displayed
The hydraulic BIT must be performed
