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
When will the electrical PBIT be interrupted
If:
- Any hydraulic pump is turned ON
- if the FCP switches are cycled
- if AC power is interrupted while test is running
What is he hydraulic PBIT
It is a functional check of the flight control actuators
When is the hydraulic PBIT performed
Automatically, only on the ground, when all three hydraulic systems are pressurized
How long does the hydraulic PBIT take and when will it be interrupted
1 min. Interrupted if any control surface is moved.
Under what temperature is the hydraulic PBIT not performed*
When temps within hydraulic reservoir are lower than 10C unless the FLT CTRL BIT EXPIRED is displayed
How do you rerun the hydraulic PBIT if interrupted
All three hyd systems must be depressurized
What backs up the fly by wire system
A dedicated battery will power the system for 15 mins
What charges the FBW backup battery
DC ESS 3
On the elevator, which actuator does hyd system 1 power
Left outboard actuator
On the elevator, which actuator does hyd system 2 power
Left and right inboard actuators
On the elevator, which actuator does hyd system 3 power
Right outboard actuator
What is elevator thrust compensation
They system will automatically adjust pitch for a change in engine thrust
What is the HS-ACE priority logic
1- backup switches
2- captain
3- FO
4- FCM (auto trim)
What type of actuator is the HS-ACE
Electro mechanical
Which HS-ACE channel is active during electrical failure
Channel 2
Which PCU does hyd sys 2 control on the ailerons
Left and right inboard
Which PCU does hyd sys 3 control on the ailerons
Left and right outboard
Who’s side gets the aileron artificial feel input
Captain’s
What is the purpose of NORMAL mode
The FCM will increase or decrease the control surface movement based on airspeed
Which hyd sys powers the upper rudder actuator
1
Which hyd sys powers he lower rudder actuator
3
In Direct mode, what determines whether the rudder will operate in low-speed fixed gain or high-speed
Flaps extended or retracted
What happens to the flaps/slats when the RAT is supplying the electrical power
- They operate at half speed
- They are limited to position 3
After touchdown, when will the FCM the multifunction spoilers and ground spoilers to deploy
- weight on wheels
- wheel speed above 45 kts or airspeed above 69 kts
- thrust lever angle below 26 degrees
When will ground and multi spoilers retract on rollout
- When wheel speed is below 45 kts for at least 5 secs
- or if thrust levers are moved to beyond TLA of 35 degrees
Are ground spoilers available in direct mode
No
If deployed, when will speed brakes automatically retract
Upon selecting flaps/slats 2 or above
Under what airspeed will the speed brakes not deploy
180 kts
During a go-around or any other time in flight, when will speed brakes automatically retract
- Speed below 180 kts
- thrust lever angle above 70 deg
Are speed brakes available in Direct mode
No
What are the high level functions provided in normal mode
- elevator control laws scheduling with airspeed
- auto thrust compensation with elevator
- AOA limiting
- rudder airspeed gain scheduling and stroke limiting
- yaw damper and turn coordination
- rudder flight authority
- roll spoiler scheduling with airspeed and speed brake deployment
- config change compensation with horiz stab due to speed brakes actuation
