Crj Flight Controls

Question 0

How many hydraulic systems power ailerons and spoilerons?

Answer 0

Each is operated by 2 hydraulic systems

Question 1

How are the control surfaces actuated?

Answer 1

Inputs to hydraulic control units. (Pcu’s)

Question 2

How many hydraulic systems operate rudder and elevator.

Answer 2

All 3 systems

Question 3

Which hydraulic system maintains flight control in emergency?

Answer 3

System 3 acmp 3 from adg bus

Question 4

What are secondary flight controls?

Answer 4

All trims
Flaps
Spoilers

Question 5

How are the flight controls operated?

Answer 5

Via cables and pushrods to the pcu’s.

Mechanically operated hydraulically actuated

Question 6

What us thd procedure for a jammed aileron?

Answer 6

Qrh

Pull roll disconnect handle.
Select roll sel light on in jammed side giving control to operable side of both spoilerons.

Question 7

What does the bungee breakout do?

Answer 7

In the event of a pcu runaway. A signal is sent to the secu. The secu then sends a signal to respond to the operable control wheel. Secu ghen illuminates green roll sel light in front of pilot who should take control prior to pulling roll disc handle.

Question 8

What do the yaw dampers do?

Answer 8

Improve stability and dampen out oscillations that could lead to Dutch roll.

Question 9

What do flutter dampners do?

Answer 9

Prevent flutter with loss of hydraulic pressure to the pcu’s.

Gust lock on ground through trapped hydraulic pressure.

Question 10

How are flaps and trims powered?

Answer 10

Electrically through screw jacks

Question 11

How id aileron trim powered?

Answer 11

Electric signal to move them via hydraulic power.

Question 12

How is the stabilizer powered?

Answer 12

Electric trim motors position a screwjack

Question 13

How do we disengage z runaway pitch trim?

Answer 13

Pitch trim disc on pilot yoke.

Question 14

What is stab trim priority

Answer 14

Pilot
Copilot
Autopilot
Auto trim
Mach trim

Question 15

What does Mach trim do

Answer 15

Adjust trim for rearward movement of center of pressure. Prevents Mach tuck.
Calculated by information from the adcs

Question 16

What must be operable for the Mach trim to function?

Answer 16

Both hstcu channels and one stab channel engaged.

Question 17

How are flaps controlled?

Answer 17

Through signals sent to the fecu from actuating the flap control handle.
The fecu commands brake release and two ac powered drive units (pdus) on the flap gearbox are energized extending of retracting flaps.

Question 18

What compromises the gld system?

Answer 18

Spoilerons
Flight spoilers
Inboard/ outboard ground spoilers

Question 19

When will the glds deploy?

Answer 19

With 2 of 3

L or r mlg wow
Wheel speed >16 kts
Radio altitude <. 5 ft

Question 20

When will glds retract?

Answer 20

L or r engine >79%

Thrust at takeoff power

Question 21

What does the takeoff config monitor?

Answer 21

Flaps
Flight spoilers
Parking brake
Autopilot
Aileron, rudder, and stab trims

Question 22

What is the purpose of the Mach transducers?

Answer 22

Supply Mach data to the stall protection system for Mach compensation of thd stall margin.

Question 23

What other computer supplies data to the sps?

Answer 23

Acdc air data computer