Flight Controls Flashcards
Secondary flight control system composed of
4
Horizontal stab
Flaps and slats
Multifunction spoiler when used as speed brakes or ground spoilers
Dedicated ground spoilers
Primary flight control
System composed of
4
Ailerons and multi function roll spoilers
Elevators
Rudder
Which controls are fly by wire
Elevators
Rudders
All secondary flight controls
Which controls are not fly by wire
Ailerons
What are the 2 primary flight control electronics
P- ACE. ( primary actuator control electronics)
FCM. (Flight control modules)
These 2 together operate either
The electro hydraulic
Or
Electro mechanical actuators
How many FCM’s
4
How many ACE’s
9
2 modes of FCS OPERATION
Normal and
Direct
What is direct mode
The FCM is removed from the loop
I.e. Loss of data from all FCM or multiple ACE failures
How can pilot change modes
Pushing the flight controls mode button will always let pilot toggle between modes
What is the PBIT test and how long is it good for
Power up built in test
Tests both electrical and hydraulic systems
Good for 50 hours
How long does the electrical PBIT take
3 minutes
Automatic on power up
How long does the hydraulic PBIT take
1 minute
Performed automatically on ground when all 3 hydraulic systems are powered
The hydraulic PBIT does not run when reservoir temps are lower than _____. Except when
50°f or 10°c
Flt control bit expired is shown
How are elevator surfaces actuated
Hydraulically through PCU
What does the ETC do
Elevator thrust compensation
Applies elevator controls to reduce pitching from thrust changes
How is the horizontal stabilizer controlled
Electro-mechanical by either the trim switches
Yoke or pedestal
Or through FCM from autopilot and speed brakes
Manual pilot trim inputs are limited to __ second intervals to prevent runaway
3
Stabilizer trim priority
- Backup switches
- Captain
- First officer
- FCM
In case if electrical failure followed by RAT deployment the trim function will operate at
Half speed for manual or autopilot
On which side is the aileron AFU located
Captains
How many multifunction spoiler panels
6
L3, L4, L5. ( left wing)
R3, R 4, R 5( right wing)
How is the rudder controlled
2 Electro hydraulic actuator
Captain controls upper and
FO THE lower
How many flaps and slats
4 flaps –/2 per wing
8 slats-// 4 per wing
How many flap/slat positions
6
Are flaps slats electrical or hydraulic
Electrical
Can the slats flaps be moved if the strike protection is actuated
Yes, up to 2 more times
If the RAT. Is only source if AC power the slats flaps operate at ___ and they are limited to flap position___
Half speed
Flaps 3 to provide adequate airflow for the RAT
Will flaps still move with a slat failure
What about the other way
Yes
How many spoiler panels
10 which includes the 6 multifunction panels 3-5
3 modes of multifunction operation
Roll control
Speed brakes
Ground spoilers
Which spoiler panels actuate for ground deployment
All 10 automatically to full travel limit
Requirements for ground spoiler deployment
Weight on wheels
Wheel speed above 45 kts or
Airspeed above. 60 kts
TLA below 26°
On rollout when will spoilers retract
Wheel speed below 45 kts for 5 seconds or TLA increased above 35°
Ground spoilers not available in
Direct mode
Speed brakes not avail in
Direct mode
How many panels on speed brakes
All 6 multifunction panels
Up to inflight limit if 30°
When will speed brakes automatically retract
Slat flap lever position 2 or higher
Airspeed below 180 kts
TLA beyond 70° ( go around)
