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Karen > Flight Controls > Flashcards

Flight Controls Flashcards

1
Q

Which yoke is connected to the left aileron ?

A

Captain’s

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2
Q

How are the ailerons, elevators and rudders actuated?

A

Yoke and pedals operate a system of cables and pulleys that connect to pull and push rods at the flight control which operate a hydraulic PCU (power control unit) which HYDRAULICALLY actuates.

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3
Q

Which yoke controls the right elevator?

A

First officer’s

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4
Q

Which yoke controls the left elevator?

A

Captain’s

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5
Q

What is the purpose of the multifunction spoilers (MFS)?

A

To assist with roll control and serve as a spoiler in flight and on landing.

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6
Q

Are the multifunction spoilers operational at any speed?

A

Yes

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7
Q

Which yoke is connected to the right aileron?

A

First Officers

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8
Q

How are the MFSs controlled when used for roll assistance?

A

The FOs yoke position sends an electrical signal to the left MFS panels which are hydraulically operated by the PCUs. The Captain’s yoke position sends an electrical signal to the right MFS panels which are hydraulically operated by the PCUs.

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9
Q

What is the flight deck indication of a jammed aileron cable?

A

Both yokes will be jammed

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10
Q

What happens after the ROLL DISC handle is pulled ?

A

The aileron cable and pulley systems are disconnected through torque tubes. Twenty seconds later, if the operable side has not been selected, the amber ROLL SEL switch illuminates.

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11
Q

How is the operable side selected?

A

By pushing the ROL SEL /PLT ROL switchlight on the unjammed side

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12
Q

What does pushing the ROL SEL /PLT ROL switchlight accomplish?

A

Allows the pilot with the operable aileron control the on-side MFS panels

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13
Q

What is the flight deck indication of an aileron PCU runaway?

A

Aircraft begins an uncommanded roll and the PLT SEL switchlight on the side without the PCU runaway illuminates automatically because of the bungee break-out symbol.

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14
Q

What is occurring when the pilots trim the ailerons or rudders?

A

The control surface is being repositioned. There are no trim tabs.

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15
Q

What panels are part of the GND LIFT dumping system?

A

Inboard and outboard ground spoilers, all 4 MFS panels

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16
Q

How are the flight controls gust locked?

A

Hydraulic fluid is trapped during shutdown

17
Q

How is the yaw damper engaged?

A

YD1 and YD2 engage switchlights on the center pedestal

18
Q

How is the yaw damper disengaged?

A

DISC button on the center pedestal

19
Q

What controls the yaw damper ?

A

The flight control computer

20
Q

Is it necessary to disconnect the yaw damper on landing?

A

No

21
Q

How are the flaps operated?

A

Electrically

22
Q

How many flap segments does the CRJ 900 have?

A

4 total - 2on each side

23
Q

Is there any asymmetrical protection within the flaps?

A

Yes, if the flap segments differ by 5°, the FLAP brakes are applied and the flaps will remain at the current position.

The Flap Electronic Control Unit (FECU) will prevent the flaps from being reset during flight.

24
Q

How is STAB TRIM operated?

A

Electrically. A split switch on the control yoke operates two motors that turn a jack screw changing the horizontal stabilizer angle of incidence.

25
Q

What systems can operate STAB TRIM?

A

CA’s trim switches
FO’s trim switches
Autopilot and Mach trim

26
Q

What is the priority for STAB TRIM control?

A

CA
FO
Autopilot
MACH trim

27
Q

Extra

What are the two types of multifunction spoilers (MFS) and how many of them are there

A

There are 2 on each wing

OUTBOARD MFS is SPOILERON

INBOARD MFS is FLIGHT SPOILERON

28
Q

Extra

What is a flutter damper

A

Double acting shock absorber installed on each aileron

Prevent flutter when all hydraulic fluid is lost at the PCU during flight (power control unit)

Provide additional gust lock on the ground

29
Q

Extra

How many PCUs does the rudder have

A

3

30
Q

Extra

When does Rudder travel limits exist and how many degrees is it

A

Writer travel is limited to in-flight condition which is defined as 2 to 3 seconds after lift off to touchdown

Router travel limit is automatically programmed 3 to 33°

RTL Is a function of
Airspeed
Flap position
Engine Operation

31
Q

How many y’all dampers are there and how do they work

A

There are two independent -YD1 and YD2

Improve stability by damping out oscillations in yaw

Oscillations could lead the dutch roll

Operate independently of auto pilot system

Controlled by the flight control computers

FCC1 Controls YD1 and FCC2 controls YD2

32
Q

Extra

How many elevators are there and how do they work

A

2
Each elevator is hydraulically powered by three PCUs

Left control wheel cable/pulley system is connected to the left elevator PCU

Controls are normally interconnected for simultaneous movement from either station

PCUs provide gust lock on the ground

33
Q

Extra

What does the pitch disconnect handle do?

A

Isolates the left elevator system from the right elevator system in the event of a jam

Once disconnected the left control will controls the left elevator and the right control wheel controls the right elevator

Pull handle up and rotate 90° to lock in position

On EICAS page-Obermark represents -23.6°
Center mark represents neutral
Lower Mark represents +18.4°

34
Q

Extra

How does Horizontal Stabilizer Trim work?

A

Provides pitch trim by varying the horizontal stabilizer angle of incidence from +2° nose down to -13° nose up

Position by jack screw driven by chew electric trim motors in control by SSCUs

Two channels engage by selecting the channel 1 and channel 2 switch lights on Stabbed trim control panel located on the center pedestal

35
Q

Extra

Mach trim- what is it and how does it work

A

The mock trim function makes allowances for the rearward shift of the arrow dynamic center of pressure as the Mach number increases.

Without correction this shift in the center of pressure causes a negative stick force gradient and decreases longitudinal stability (Mach tuck) above Mach .4 when hand flying.

The SSC you automatically adjust the stabilizer as a function of the mock number when the auto pilot is not engaged. Both F cc must signal the need for trim before any trim activity occurs.

The automatic mock trim is last in the order of priority. With the auto pilot off and no pilot stabbed trim commands inputted the mock trim automatically moves the stabilizer to compensate for changes in air speed. Mach trim moves a stabilizer at the slowest rate.

The Mach trim system, uses Mach speed information from the air data computers (ADC), varies the angle of incidence of the stabilizer by commanding movement of the horizontal stabilizer actuator. Both channels of the SSCU must be operable and at least one STAB Channel in gauge for the mock trim to function

Karen (22 decks)

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