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Boeing 757 Technical > Flight Controls > Flashcards

Flight Controls Flashcards

1
Q

What can you do it a jam occurs on a control column or wheel?

A

Overide with the other one

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2
Q

RAT provides hyd power to what systems flight controls?

A

Centre hyd system

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3
Q

When does RAT auto deploy?

A

When both engines fail

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4
Q

What does RAT PRESS light mean?

A

RAT providing adequate hyd pressure to power flight controls

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5
Q

How many spoilers and how many slats?

A

12 spoilers, 10 slats

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6
Q

What hyd systems power the elevator?

A

all 3

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7
Q

What provides elevator feel? (2)

A

Two elevator feels systems provide artificial feel, with a mechanical spring system following loss of the centre and right hyd systems

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8
Q

Stab trim powered by what hyd syste,s? (2)

A

Centre and Right

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9
Q

Three modes of stabiliser trim?

A
  • electric
  • alternate
  • automatic
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10
Q

What does green band on stab trim indicator mean?

A

Take off range

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11
Q

If trim indicator inoperative what shows?

A

Off flag band

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12
Q

How many trim modules and brakes for the stab trim?

A

2

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13
Q

IF wanting less than 3 units of trim what system is needed?

A

Alternate trim system

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14
Q

What uses the auto trim system? (2)

A

Autopilot and Mach Speed trim system

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15
Q

What rate does the auto stabiliser trim at?

A

Half as it only uses one trim module

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16
Q

Which autopilots use what trim module for trimming?

A 
Left A/P = left module
Right A/P = right module
Centre A/P = Left module, but uses right automatically if left module fails
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17
Q

What happens if you trim with A/P engaged?

A

Disconnects the A/P

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18
Q

When are electric trim switches inhibited? (2)

A

In G/A or autoland with multiple autopilots engaged

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19
Q

What does MACH/SPD TRIM indicate?

A

Fault in system, no noticeable change in a/c controllability

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20
Q

When UNSCHED STAB TRIM illuminate? (2)

A
  • Moves without trim signal

- Movement is opposite to direction signalled

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21
Q

STAB TRIM mean?

A

Trim rate is down to one half of normal control wheel switch rate. If problem unique to electric control wheel trim then full rate available on alt stab system

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22
Q

Rudder system uses which hyd systems?

A

all 3

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23
Q

Primary purpose of rudder ratio?

A

Changes amount of rudder available depending on speed to prevent structural damage

24
Q

Rudder ratio powered by what hyd system?

A

Left

25
Q

If RUDDER RATIO on what does this mean and how is structural protection still provided?

A

Rudder ratio system inoperative so caution at high speeds, but left hyd system is depressurised to provide some protection at high speeds

26
Q

Avoid abrupt pedal inputs above what speed?

A

160kts

27
Q

Yaw damper provides?

A

Turn coordination and dutchroll damping

28
Q

What inputs into yaw dampers and which hydraulic systems?

A

Left and right hydraulic systems and IRS

29
Q

Yaw damper inop light mean?

A

IRS not aligned or a fault if after IRS aligned or a pressure loss

30
Q

If fault in Yaw damper does it automatically depressurise that system?

A

Yes

31
Q

Hyd power to the left and right ailerons?

A 
Left = C + R
Right = C + L
32
Q

How many spoilers assist in roll control?

A

10 out of the 12

33
Q

What happens if aileron trim switches used with A/P in?

A

Puts in trim and wont notice until after A/P out - may be an undesirable setting

34
Q

When do spoilers deploy when armed for landing? (3)

A
  • On touchdown (weight on wheels and untilted)
  • Hyd pressure to gear tilt actuators
  • Thrust levers at idle
35
Q

If on ground an select reverse thrust what happens to speedbrakes (regardless of lever position)

A

Deploy

36
Q

When does SPEEDBRAKES EXT come on in flight? (2)

A

Speedbrakes are out and

  • Flaps in a landing position (25 or above)
  • Radalt below 800ft
37
Q

If AUTO SPDBRK illuminates what mean? And what do if in Armed?

A

Fault is detected, if armed move to down to avoid inadvertent speedbrake extension

38
Q

When does speedbrake auto move from up to armed during landing? (2)

A
  • When thrust levers moved forward from idle

- During a bounce when weight comes back off the wheels

39
Q

What does SPOILERS light mean?

A

One or more spoilers pair failed to operate as demanded

40
Q

What systems used for normal and alternate flaps and slats?

A

Normal =hydraulic

Alternate = electric

41
Q

What do detents in flap selector do at flaps 1 and flaps 20?

A 
1 = inadvertent retraction of slats
2 = inadvertent retraction of flaps in go-around position
42
Q

How many slats and where located?

A

10, 2 inboard of engine, 8 outboard

43
Q

How many flaps?

A

2 on each side

44
Q

What manoeuvre speed for flaps 15 and 20?

A

VREF 30 +20

45
Q

Max height for flaps/slats?

A

20000ft

46
Q

How does flap load relief system work?

A

Only for flaps 30 - prevents selection from 25 to 30 or retracts flaps from 30 to 25 if overspeed

47
Q

What does selection of the alternate flaps system do?(4)

A
  • disables normal control
  • arms the alternate mode
  • engages the electric motor
  • disables the flap lever
48
Q

How long can alternate flaps take to go from up to 20?

A

Up to 2 min

49
Q

The alternate flap system is limited to what flap settings?

A

up to 20

50
Q

What systems lost when using alternate flap?

A
  • Trailing edge flap asymmetry protection
  • autoslats
  • flap load relief
51
Q

What happens to both slats and flaps hydraulic systems if either Leading edge disagree or leading edge asymmetry is indicated?

A

Both flaps and slats power automatically shut off

52
Q

What happens to normal hydraulic power to flaps and slats with a training edge asymmetry or disagree?

A

Automatically power shut off

53
Q

Why do not arm alternate trailing edge or slat when trailing edge flap or slat asymmetry?

A

No asymmetry protection during alternate flap/slat operation

54
Q

What flap/slat setting will autoslat system auto deploy slats to landing position at stick shaker?

A

Flaps 1-20

55
Q

What hyd system must be powered for autoslats?

A

Left

56
Q

What do the flight control shut off valves control hydraulic power to? (3)

A

Stabiliser, rudder, and elevator

Boeing 757 Technical (16 decks)

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