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Boeing 757 Technical > Flight Controls > Flashcards

Flashcards in Flight Controls Deck (56):
1

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

Overide with the other one

2

RAT provides hyd power to what systems flight controls?

Centre hyd system

3

When does RAT auto deploy?

When both engines fail

4

What does RAT PRESS light mean?

RAT providing adequate hyd pressure to power flight controls

5

How many spoilers and how many slats?

12 spoilers, 10 slats

6

What hyd systems power the elevator?

all 3

7

What provides elevator feel? (2)

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

8

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

Centre and Right

9

Three modes of stabiliser trim?

- electric
- alternate
- automatic

10

What does green band on stab trim indicator mean?

Take off range

11

If trim indicator inoperative what shows?

Off flag band

12

How many trim modules and brakes for the stab trim?

2

13

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

Alternate trim system

14

What uses the auto trim system? (2)

Autopilot and Mach Speed trim system

15

What rate does the auto stabiliser trim at?

Half as it only uses one trim module

16

Which autopilots use what trim module for trimming?

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

17

What happens if you trim with A/P engaged?

Disconnects the A/P

18

When are electric trim switches inhibited? (2)

In G/A or autoland with multiple autopilots engaged

19

What does MACH/SPD TRIM indicate?

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

20

When UNSCHED STAB TRIM illuminate? (2)

- Moves without trim signal
- Movement is opposite to direction signalled

21

STAB TRIM mean?

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

22

Rudder system uses which hyd systems?

all 3

23

Primary purpose of rudder ratio?

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

24

Rudder ratio powered by what hyd system?

Left

25

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

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

26

Avoid abrupt pedal inputs above what speed?

160kts

27

Yaw damper provides?

Turn coordination and dutchroll damping

28

What inputs into yaw dampers and which hydraulic systems?

Left and right hydraulic systems and IRS

29

Yaw damper inop light mean?

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

30

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

Yes

31

Hyd power to the left and right ailerons?

Left = C + R
Right = C + L

32

How many spoilers assist in roll control?

10 out of the 12

33

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

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

34

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

- On touchdown (weight on wheels and untilted)
- Hyd pressure to gear tilt actuators
- Thrust levers at idle

35

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

Deploy

36

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

Speedbrakes are out and
- Flaps in a landing position (25 or above)
- Radalt below 800ft

37

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

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

38

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

- When thrust levers moved forward from idle
- During a bounce when weight comes back off the wheels

39

What does SPOILERS light mean?

One or more spoilers pair failed to operate as demanded

40

What systems used for normal and alternate flaps and slats?

Normal =hydraulic
Alternate = electric

41

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

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

42

How many slats and where located?

10, 2 inboard of engine, 8 outboard

43

How many flaps?

2 on each side

44

What manoeuvre speed for flaps 15 and 20?

VREF 30 +20

45

Max height for flaps/slats?

20000ft

46

How does flap load relief system work?

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

47

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

- disables normal control
- arms the alternate mode
- engages the electric motor
- disables the flap lever

48

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

Up to 2 min

49

The alternate flap system is limited to what flap settings?

up to 20

50

What systems lost when using alternate flap?

- Trailing edge flap asymmetry protection
- autoslats
- flap load relief

51

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

Both flaps and slats power automatically shut off

52

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

Automatically power shut off

53

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

No asymmetry protection during alternate flap/slat operation

54

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

Flaps 1-20

55

What hyd system must be powered for autoslats?

Left

56

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

Stabiliser, rudder, and elevator