Autoflight/Flight Controls Flashcards
Are both Flight Guidance Modules required for autoflight?
Yes, but 1 can provide FD
The AP Pitch Trim function operates at two speeds:
High speed for CAS below 180 knots
Low speed for CAS above 180 knots
FCECU stands for
Flight control electronic control unit, single unit with two channels
How many PCUs control each elevator?
3 power control units per elevator, 6 total
What hydraulic systems power which PCU?
1 outer
2 center
3 inboard
What is the purpose of the overload bungee in the elevator?
They will break to ensure that PCU does not jam the elevator
What gives the elevator gust protection?
3 hydraulic compensator keeps elevator locked
How does the FCECU control trim rate
Based on airspeed
What will cause an elevator asymmetry?
Position disagreement of 5 degrees below 180 kts or 1.5 degrees above 181 kts between left and right elevator surfaces
What gives you an elevator feel caution light?
position disagreement between left and right pfu’s
Total travel of rudder
18 degrees on fore section
36 degrees on aft section
Where are the rudder PCU’s located?
PCU 1 lower
PCU 2 upper
Describe the rudder system
mechanically activated, hydraulically actuated, does not have two independent sides, has two PCUs in tail
Is rudder travel mechanically limited?
Rudder travel is mechanically limited (approx 12 degrees left or right) when flap selector is in the zero degree detent (24 degrees for aft section of rudder)
Is the rudder feel and trim unit controlled by the FCECU?
No, its a mechanical spring
How does the FCECU interact with the rudder system?
Interacts with the PCU to gather rudder trim indication
Yaw damp authority is approx
4.5 degrees max of rudder deflection either side
How are ailerons operated?
Mechanically actuated via FO control column
What tabs do you have on ailerons?
Geared tab on either side and ground adjustable tab on Right. Move opposite of deflection.
What hyd system power inboard and outboard spoilers?
#1 Hyd System powers inboard spoilers #2 Hyd System powers outboard spoilers Outboard spoilers are deactivated above 170 kts
How do the outboard spoilers work?
FCECU commands actuator unload valve to dump pressure to outboard spoilers above 170 kts
Spoiler operation modes
Flight Mode and Taxi/Ground Mode
Flight taxi switch, pwr lever position, wt on wheels
What hyd system powers flaps?
Hyd system 1
AHARS alignment time
60 s ground
90 s flight
What screens function with battery power only?
MFD1
ED
MFD1 Reversion Selector
All pushbutton on ESCP
The Flap Auto Pitch Trim feature automatically engages when all of the following conditions exist:
Airborne for two seconds, CAS is less than 180, AP not engaged, no operating manual pitch trim, AFCS detects flaps are moving between 15 and 35 range
