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650 > Week 2 Day 1 > Flashcards

Week 2 Day 1 Flashcards

1
Q

When will the BFCU take charge of the fly by wire system?

A

If you have a failure of all 4 FCC channels

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2
Q

How many REU’s are there? What is unique about them?

A
  • 16 REU’s. One for each flying control surface

- All same part number and software revision status

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3
Q

How many MCE’s are there?

A

7 MCE’s. One for each EBHA install

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4
Q

How many EHSA assemblies are there? What does EHSA stand for, and what is an assembly comprised of?

A
  • 9 total
  • Electro hydraulic servo actuator
  • REU, EHSA manifold and actuator
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5
Q

How many EBHA assemblies are there? What does EBHA stand for, and what is an assembly comprised of?

A
  • 9 EBHA assemblies
  • Electrical backup hydraulic actuator
  • REU, MCE, EB, HA manifold and actuator
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6
Q

In what order do you turn on the UPS and EBHA batteries and why?

A

EBHA prior to UPS so that MCE’s pass SPOST

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7
Q

How long does the SPOST take?

A

Approx 45 seconds

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8
Q

What aircraft mode is needed for EB (electrical backup) operation to occur?

A

Aircraft must be in air mode

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9
Q

Why would a flying control surface be in EBHA operation? (3 reasons)

A
  • total aircraft hydraulic failure
  • loss of all hydraulics at an individual service
  • loss of all REU functionality at an individual surface
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10
Q

Where does the BFCU not receive inputs from? These will result in no speed brake or ground spoiler in BFCU mode. Aircraft will still have spoiler roll assist

A
  • Speed brake handle

- aground spoiler system

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11
Q

For normal FCC operation, what parameters are required? (3 things)

A
  • at least 2 smart probes operating, providing data and heated
  • at least 1 IRU operating and providing data
  • must have an operational HSC system (HSCU) and communicating with the FCC’s
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12
Q

When is FCC alternate mode in operation?

A
  • Normal mode parameters not met

- can revert back to normal through FCC reset switch (if parameters now met). Also can happen automatically

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13
Q

When is FCC direct mode in operation?

A
  • FCC channels in disagreement

- cannot FCC reset without downing power

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14
Q

What is the other function of the FCC reset switch?

A

Prior to electrical rigging, it tells all REU’s to be ready for rig

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15
Q

In the alternate and direct FCC modes, what are the two control laws?

A
  • high speed gain (340 knots)

- low speed gain (250 knots)

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16
Q

What type of inputs are there into the FCS system?

A

Conventional (stick and pedals) input by pilot, copilot or autopilot

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17
Q

How is the FCS system controlled and actuated?

A

Electrically controlled and hydraulically actuated

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18
Q

Hi is the FCC system displayed?

A
  • 2/3 synoptic - detailed or standard
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19
Q

How many cables are there in the flight control system? What are they for, and are they interchangeable?

A
  • 4 total not interchangeable
  • all for aileron control
  • from control wheels to control modules (under cockpit floor)
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20
Q

What type of bus are the FCS command data buses?

A

Arinc 429

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21
Q

During normal FCC operation, what status are the EHSA and EBHA assemblies in?

A

Both active

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22
Q

What distinguishes B modules from A modules in the FCC’s?

A

B have additional lobes

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23
Q

In the FCC, each channel has two channels, which are they?

A

Control and monitor

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24
Q

What powers the FCC? (Two power sources)

A
  • UPS battery

- Essential DC bus

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25
Q

What could a blue FCS maintenance required CAS message indicate?

A

FCC channel module software not identical

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26
Q

What position are the monitor modules placed in the FCC?

A

Monitor are nearest the fan (inboard)

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27
Q

On even calendar days, which FCC channels are in command of the fly by wire systems?

A

1A and 2B (UPS powered systems)

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28
Q

On odd calendar days, which FCC channels are in command of the fly by wire systems?

A

1B and 2A (ESS powered systems)

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29
Q

To dispatch with a failed FCC channel, where must the modules be placed?

A

In a UPS powered position (fly for 3 days)

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30
Q

When you pull a module from an FCC, what do you need to perform an inspection of module and back plane?

A

Torch and 6x magnifying glass

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31
Q

When changing an FCC module (or both modules in one channel), what follow ons are required?

A

SPOST only

32
Q

When changing modules in both channels of an FCC, how do you do it?

A

Change one at a time, do the SPOST

33
Q

When changing FCC modules from three channels, how do you do it?

A

Change one at a time, then SPOST, then electric rig

34
Q

Where does the flight data recorder get flight data from?

A
  • MAU’s

- not directly from the FCC’s

35
Q

How do we know SPOST has finished?

A

Stick shaker (8 shakes)

36
Q

Is there a stick pusher on the aircraft?

A

No, FCC’s won’t allow aircraft to stall in normal mode

37
Q

In the RVDT clusters, why do we have 5 individual RVDT’s?

A
  • 1 for each FCC channel 4

- 1 backup

38
Q

What does the BFCU communicate with? And how?

A
  • EBHA assemblies only

- commands only

39
Q

BFCU reports to which channel modules of the FCC?

A

B channels

40
Q

Can you repair a fly by wire harness?

A

No, replacement only

41
Q

What are the four FCC normal mode sub modes?

A
  • ground
  • takeoff/landing
  • cruise
  • angle of attack
42
Q

What do you lose in FCC alternate mode?

A
  • Stall protection

- Autopilot

43
Q

What do you lose in FCC direct mode?

A
  • speed brake
  • spoilers
  • autopilot
  • stall protection
44
Q

When is low speed gain CLAWS in effect?

A

When flaps and landing gear handles are down

45
Q

When is high speed gain CLAWS in effect?

A

When flaps and landing gear handles are up

46
Q

When is FCC maintenance mode available? (Used for rigging and maintenance)

A
  • On ground
  • left and right wheel speed low
  • flight control maint switch on
47
Q

Ok aircraft 6165 and subsequent, or aircraft with ASC 37, what do ailerons also work as on touchdown?

A

Ground spoilers

48
Q

Where is the BFCU located?

A

Underfloor behind the TRU’s

49
Q

To disengage the BFCU, what has to happen?

A
  • power cycle

- at least one FCC channel available

50
Q

Which side are the pitch and roll RVDT clusters located?

A
  • pitch left

- roll right

51
Q

What is in the input shaft of the RVDT clusters, and in each RVDT, to insure against the negative effects of a mechanical jam in the cluster?

A

Shear point

52
Q

What ensures correct RVDT installation on to the control module?

A

Splined shaft and alignment pin

53
Q

On the EHSA actuator, how many position LVDT’s are there?

A

One

54
Q

On the EBHA actuator, how many position LVDT’s are there?

A

Two

55
Q

What prevents the EB manifold actuator, and the HA manifold actuator from fighting each other if minute differences occur?

A

Force equalisation loop

56
Q

EBHA manifolds and MCE’s are located where on primary flight controls? (Inboard or outboard)

A

Inboard

57
Q

EBHA manifolds and MCE’s are located where on spoilers? (Inboard or outboard)

A

Outboard

58
Q

What prevents total loss of pressure in the EB and HA manifolds in event of hydraulic failure?

A

Check valves

59
Q

When total hydraulic system failure happens, and the check valves in the manifolds operate, what happens to circulate fluid in the EBHA closed system?

A

MCE energises in built resolver and pump to move fluid. MCE ports fluid as per normal

60
Q

If you lose an REU, what happens to the associated actuator?

A

Goes into damping mode

61
Q

What if you lose both REU’s on a single flight control surface?

A

MCE takes over, flight control goes into EB mode. HA actuators go into dampen mode

62
Q

How far do you have to pull and REU or MCE from the manifold before rotating?

A

1/4 inch

63
Q

What part of the EBHA/EHSA manifold provides gust lock protection?

A

Compensator

64
Q

How do you depressurise the EBHA/EHSA manifolds for maintenance?

A

Relief valve plunger and pin

65
Q

When are suite A checks performed?

A
  • every 600 hours

- whenever fly by wire components are changed

66
Q

During the suite A check, how often are each of the components checked?

A

Twice

67
Q

Where do right system hydraulic lines run?

A

Along front of the wing then through to the rear spar

68
Q

Where do left wing hydraulic lines run?

A

Along the trailing edge

69
Q

When removing a flight control actuator, where do you remove the toggle link?

A

From the control surface, not the actuator

70
Q

What is the only flight control surface with a stand alone RVDT and why is it there?

A
  • Elevator

- redundancy for pitch control

71
Q

How many control module assemblies are there?

A
  • 3
  • 1 rudder (pilot and copilot)
  • 2 pitch and roll
72
Q

If you had to replace an RVDT cluster, how would you check the binding?

A

Low resistance ohmeter

73
Q

How do you relieve manifold pressure in outboard spoiler EHSA manifolds?

A

Compensator pins and power retract spanner

74
Q

How do you relieve manifold pressure in an aileron EHSA manifold?

A

Compensator pin

75
Q

How do you relieve manifold pressures in mid and inboard spoiler EHSA manifolds?

A

Power retract spanner

650 (9 decks)

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