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B737-800 > Flight Controls > Flashcards

Flight Controls Flashcards

1
Q

If the aileron control system is jammed on the captains side, force applied to the FO’s side provides roll control through

A

the spoilers

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2
Q

if the aileron control system is jammed on the FO’s side, force applied to the CA’s side provides roll control through

A

the ailerons

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3
Q

What happens when you press both aileron trim switches?

A

Trim electrically repositions the aileron feel and centering unit and the control wheel will rotate and define a new neutral position

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4
Q

How many flight spoilers are there?

A

four on each wing

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5
Q

When the control wheel is displaced more than approx. ___degrees, spoiler deflection is initiated

A

10

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6
Q

FLIGHT SPOILER Switches

A

ON (guarded position)- normal operating position

OFF- closes the respective flight spoiler SOV

MX ONLY

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7
Q

In the event of a control column jam, how will the elevator ccontrol be affected?

A

The override mechanism will allow the control columns to be separated and the free control column will provide adequate control.

Total available elevator travel will be significantly reduced but enough will be available to flare

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8
Q

Can you use stabilizer trim if there is a control column jam?

A

Yes

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9
Q

What does the elevator feel system do?

A

provides simulated aerodynamic forces using airspeed from the elevator pitot system and stabilizer position.

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10
Q

Which hydraulic system pressure does the elevator feel computer use?

A

Whichever is higher

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11
Q

FEEL DIFF PRESS light

A

indicates excessive differential pressure in the elevator feel computer

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12
Q

What does the Mach trim system do and how?

A

Provides speed stability at higher mach numbers.

It uses mach info from the ADIRU to compute a mach trim actuator position and repositions the elevator feel and centering unit which adjusts the control column neutral position

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13
Q

Above what speed is mach trim automatically accomplished?

A

.615M

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14
Q

The main electric and AP stabilizer trim have how many modes?

A

High speed with flaps extended

Low speed with flaps up

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15
Q

the STAB TRIM MAIN ELECT and STAB TRIM AUTOPILOT cutout switches

A

allow the AP or main electric trim inputs to be disconnected from the trim motor

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16
Q

What happens when the STAB TRIM override switch is positioned to OVERRIDE

A

the electric trim can be used regardless of control column position

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17
Q

Will manual rotation of the trim wheel override the AP or main electric trim?

A

Yes

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18
Q

What is the speed trim system (STS)

A

improves flight characteristics during operations with low gross weight, aft CG, and high thrust when AP is not engaged.
returns a/c to a trimmed speed by commanded stablizer in a direction opposite the speed change

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19
Q

Conditions for STS to operate

A

fully enabled between 100 KIAS and .60M with fadeout to zero by .68M

10 seconds after takeoff

5 seconds following release of trim switches

AP disengaged

Sensing of trim requirement

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20
Q

What three systems help the pilot identify and prevent further movement into a stall condition?

A

Elevator feel shift, speed trim system, an yaw damper

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21
Q

How do the EFS, STS, and yaw damper help the pilot with stall identification?

A

the EFS increases hydraulic system A pressure to the elevator feel and centering unit to double control column forces

the STS trims nose down as airspeed decreases and also enables speed trim above stickshaker AOA

the Stall Management/Yaw Damper Computer (SMYD) reduces yaw damper commanded rudder movement

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22
Q

At speeds above approx. ___ knots, both hydraulic system A and B pressure are reduced within the main PCU by approx. __% each

A

135 kts, 25% to limit full rudder authority

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23
Q

What is the Force Fight Monitor and what actions does it take when tripped?

A

it detects opposing pressure between the A and B rudder actuators (this may occur if either system is jammed/disconnected).

-Turns STandby Hydraulic Pump ON

-Opens the standby rudder SOV to pressurize standby rudder PCU
.
-Illuminates STBY RUD ON, master caution, and FLT CONT lights

24
Q

How many yaw dampers are there?

A

The main yaw damper and the standby yaw damper

25
Q

What is the purpose of the yaw damper

A

dutch roll prevention, gust damping, and turn coordination

26
Q

Which hydraulic system does the main yaw damper use?

A

B

27
Q

When does the yaw damper switch automatically move to OFF and the amber YAW DAMPER light illuminate?

A

SMYD senses a Y/D system fault

SMYD senses that Y/D does not respond to a command

B FLT CONTROL switch is positioned to OFF or STBY RUD

28
Q

When is the only time that the YAW DAMPER switch can be reset to on in flight?

A

During manual reversion when both FLT control switches are positioned to STBY RUD

29
Q

When will the auto speed brake system operate?

A

SPEED BRAKE lever in ARMED position

SPEED BRAKE ARMED light illuminated

RA less than 10 feet

Landing gear strut compression

Both thrust levers IDLE

Main gear wheels spin up (> 60 knots)

30
Q

Compression of which main landing gear strut enables the ground spoilers to deploy?

A

The right. Compression of either main gear will enable the flight spoilers, however.

31
Q

if the SPEED BRAKE lever is in the DOWN position during landing or RTO, when will the auto speed brake system operate?

A

Main gear wheels spin up (>60 knots)

both thrust levers at IDLE

reverse thrust levers positioned for reverse thrust

32
Q

LE devices consist of what?

A

two LE inboard flaps and four LE slats outboard of each engine

33
Q

Which hydraulic system normally operates the LE and TE flaps?

A

B

34
Q

What happens to the LE devices when the flap handle is selected to 1, 2 or 5

A

the LE flaps extend to full extended

the LE slats extend to the extend position

35
Q

What happens to the LE devices when the flap lever is selected to beyond 5?

A

the LE flaps stay fully extened

the LE slats extend to the fully extended position

36
Q

from which side does the Flap Slat ELectronic Unit receive data?

A

the left ADIRU (so if they CA’s airspeed is too high for the selected flap setting, the flap load relief activates and retracts TE flaps to next lower position

37
Q

If the CA’s airspeed is reading erroneously high and the flap load relief function is activating, how can you achieve your desired flap setting?

A

by selecting the next higher flap detent

38
Q

Flap load relief is only available at flaps selected to:

A

30 or 40

39
Q

Flap load relief at Flaps 40:

A

retract to 30 if airspeed exceeds 163kts

re extend when airspeed is below 158 kts

40
Q

Flap load relief at Flaps 30:

A

retract to 25 if airspeed is above 176 knots

re extend when airspeed is reduced below 171

41
Q

What is the purpose of Autoslats and which hydraulic system normally operates them?

A

Enhances stall characteristics at high AOAs during takeoff or approach to landing. The slats will begin driving to full extend position as the airplane approaches stall.

Hydraulic system B

42
Q

what is the alternate source of power for the autoslat system?

A

it is provided by system A through a Power Transfer Unit. the PTU uses system A pressure to power a hyraulic pump, pressurizing the B system fluid

43
Q

Alternate Flaps Master switch

A

OFF- normal position

ARM-

  • CLoses TE flap bypass valve
  • activates standby pump
  • arms alternate flaps position switch
44
Q

Alternate flaps position switch

A

UP- electrically retracts TE flaps but LE devices remain extended

OFF - nomal

Down- momentarily will extend LE devices using standby hydraulic pressure and if you hold it, it will extend the TE flaps until released

45
Q

SPEED TRIM FAIL (amber)

A

indicates failure of STS

OR

indicates failure of single FCC channel when master caution recall is activated

46
Q

MACH TRIM FAIL (amber)

A

indicates failure of mach trim system

OR

indicates failure of single FCC channel when master caution recall is activated

47
Q

AUTO SLAT FAIL (amber)

A

indicates failure of autoslat system

OR

indicates failure of single SMYD computer during master caution recall

48
Q

What is flap asymmetry?

A

If a device on one wing does not align with the symmetrical device on the other wing

49
Q

What is flap skew?

A

when symmetrical TE flaps do not operate at the same rate causing panels to twist during extension or retraction

50
Q

What does FSEU do when it detects TE flap asymmetry or skew?

A

Closes TE flap bypass valve

displays needle split on flap position indicator

SHows position of left and right wing TE flaps

51
Q

Uncommanded motion of LE devices is detected when:

What does the FSEU do if that happens?

A

no TE flap position or autoslat command is present and two LE flaps move on one wing or two or more slats move on one wing.

The FSEU shuts down the LE control an illuminates LE FLAPS transit light

52
Q

When is TE uncommaned motion detected:

What does the FSEU do in this case?

A

when no flap lever or flap load relief command is present and the TE flaps:

move away from commanded position

continue to move after reaching commanded position

move in direction opposite to that commanded

The FSEU will close the TE flap bypass valve, which canot be reset

53
Q

Flight Control LOW PRESSURE lights

A

indicates low hydraulic system pressure to ailerons, elevator, rudder

is deactivated when associated flight control switch is positioned to STBY RUD and standby rudder SOV opens

54
Q

Standby Hydraulic Low Quantity light (amber)

A

indicates low quantity in standby hydraulic reservoir

Always armed

55
Q

Standby Hydraulic Low Pressure light (amber)

A

indicates output pressure of standby pump is low

armed only standby pump operation has been selected or automatic standby function is activated

56
Q

STBY RUD ON (amber)

A

indicates standby rudder system is commanded on to pressurize the standby rudder PCU

B737-800 (21 decks)

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