Flight Controls

Question 1

Primary flight controls are:

Answer 1

Ailerons, elevators, rudder

Question 2

Secondary flight controls are:

Answer 2

MFS (Multi function spoilers), Slats/Flaps, trim

Question 3

One ___ exists for every hydraulic system that power the flight control surface.

Answer 3

PCU

Question 4

Following a complete hydraulic failure, what controls will still be available?

Answer 4

Slats/Flaps and stab trim

Question 5

Which hydraulic system powers the inboard MFS (multi function spoilers) panels and how many PCU’s exist per panel?

Answer 5

HYD System 2

One PCU per panel

Question 6

Which hydraulic system powers the outboard MFS panels and how many PCUs exist per panel?

Answer 6

HYD System 1

One PCU per panel

Question 7

How are flaps/slats powered?

Answer 7

Electrically

Question 8

Which flight control PCUs are actuated through direct linkage?

Answer 8

Elevator, Ailerons, Rudder use cable/pully system.

Question 9

Which flight control PCUs are actuated through Fly-by-wire commands?

Answer 9

MFS

Question 10

What is a PCU and what does it do?

Answer 10

Power Control Unit; hydraulically actuates flight control surfaces

Question 11

Does a PCU require hydraulic power to actuate flight controls?

Answer 11

Yes

Question 12

Why is there not a PCU runaway procedure for elevator or rudder?

Answer 12

The other PCUs will over power the failed PCU

Question 13

From the pilot’s perspective, what will be different with an aileron jam than a PCU runaway?

Answer 13

Jam may not be noticed right away, controls are sluggish.

PCU runaway will be an uncommanded roll.

Question 14

How can you isolate a jammed aileron/elevator

Answer 14

The roll or pitch disconnect handle will use the torsion tube disconnect.

Question 15

What will occur 20 seconds after pulling the ROLL DISC handle?

Answer 15

SSCU (spoiler stabilizer control unit) illuminates both ROLL SEL lights on dash panels. Caution message will appear.

Question 16

What occurs after pressing the PLT ROLL Switchlight?

Answer 16

Connects onside MFS to the side selected. (Previously only had opposite side MFS)

Question 17

If you should inadvertently disconnect the ailerons/elevators in flight can they be reconnected?

Answer 17

Yes

Question 18

Does moving the control column move the horizontal stabilizer?

Answer 18

No, moved by stab trim

Question 19

When does the airplane automatically apply stabilizer trim?

Answer 19

When flaps are changed from 0-20 or 20-0 when hand flying it will use auto and mach trim.

Question 20

What is the stabilizer trim priority?

Answer 20

CA, FO, Autopilot, Auto Trim, Auto Mach

Question 21

How many PDUs (power drive units) exist for the flaps?

Answer 21

1 for flap (also 1 for slats)

Question 22

What does the status message FLAPS HALFSPEED mean?

Answer 22

One channel or motor of SFECU (slat flap electronic control unit) is inop. Flaps still activate just at reduced speed.

Question 23

What would result from an asymmetrical flap deployment/retraction?

Answer 23

FLAP FAIL caution message. Brake position sensor will stop movement when 5 degree difference or more is detected.

Question 24

What type of flaps are on the CRJ?

Answer 24

Double slotted flaps

Question 25

How many PDUs for the flaps?

Answer 25

2 PDUs

Question 26

Audio clacker will sound when trim is engaged for more than __ seconds.

Answer 26

3 seconds

Question 27

_____ prevents damage to ailerons when hydraulic pressure is not on or lost. This function is automatically built into the PCUs for the elevator.

Answer 27

Flutter damper

Question 28

How many SSCU’s are there (Spoiler stabilizer control unit)

Answer 28

2

Question 29

What senses slat/flap position?

Answer 29

BPSU (Brake position sensor unit) uses transmitters to stop slat movement when correct position is obtained.

Question 30

What does it mean when flap position indicator is white?

Answer 30

Difference between L and R flap is 5 degrees or greater. Flaps are misconfigured.

Question 31

What occurs when you move the EMER FLAP switch to the DEPLOY position?

Answer 31

Lowers slats/flaps to 25/20 on the CRJ-700 or 20/20 on the CRJ-900. SFECU will not allow flap overspeed. Can be reset to normal position if needed.

Question 32

List all of the functions of the MFS (Multi function spoilers):

Answer 32

Roll augmentation at low speeds, flight spoilers to slow down, ground lift dump.

Question 33

Which spoilers are the MFS (Multi function spoilers)?

Answer 33

2 OB are multifunction
2 IB are ground

Question 34

What is the logic for when the ground spoilers will deploy on touchdown vs when the MFS spoilers will deploy on touchdown?

Answer 34

Multi function assist in roll control with crosswind landings and will not deploy right away.

Question 35

What are the stall warnings/indications you would receive?

Answer 35

1. Continuous ignition on
2. Stick shaker + AP disconnect
3. Aural warbler, red stall switchlight, stick pusher

Question 36

Difference between FLT SPLR DEPLOY caution message and FLT SPLR DEPLOY advisory message?

Answer 36

Caution: when less than 300’ RA and in climb detent

Advisory: Greater than 300’ RA and below climb detent

Question 37

What is the company limit on spoiler use?

Answer 37

1000’ AGL

Question 38

At rotation the stick pusher malfunctions and inadvertently pushes, what would you do?

Answer 38

Hold AP/SP Disconnect button on yoke and if needed turn off STALL PTCT switch on either side.

Question 39

What does the BUTE door do?

Answer 39

Bent Up Trailing Edge: directs air flow over leading edge vane during flap extension

Question 40

How do you tell the difference between an inadvertent sick pusher and a nose down stab trim runaway?

Answer 40

Trim runaway clacker activates after 3 seconds. Stick pusher will be abrupt.