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B737-800 > Autoflight > Flashcards

Autoflight Flashcards

1
Q

What are the FCCs?

A

The Flight Control Computers are the brains and controllers of the auto-flight system. There are 2 (A and B). They are a central hub for processing.

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2
Q

What do FCCs calculate?

A

They calculate pitch and roll for the autoflight system

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3
Q

What FCC does the autothrottle use?

A

FCC A

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4
Q

What are FCCs powered by?

A

On-side DC BUS (i.e. FCC A powered by DC Bus #1)

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5
Q

FCCs receive pitch and heading data from…?

A

The on-side IRS

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6
Q

FCCs receive roll data from…?

A

The off-side IRS

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7
Q

How many CPUs does each FCC have?

A

Two 16 bit CPUs

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8
Q

The FCCs also control:
1
2
3

A

Speed trim
Mach trim
Alt alerting system

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9
Q

How many autopilot actuators are there?

A

4

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10
Q

Each FCC controls one……..and one…… actuator

A

Aileron……Elevator

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11
Q

FCC A controls actuators powered by which hydraulic system?

A

A

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12
Q

FCC B controls actuators powered by which hydraulic system?

A

B

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13
Q

How much control column force is needed to override a jam within an actuator?

A

100 pounds

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14
Q

The changeover altitude from speed to mach is at what FL approx?

A

FL260

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15
Q

What is the speed range in the speed window in knots?

A

100kt - 340kt

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16
Q

What is VNAV SPD?

A

Target FMC speed

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17
Q

What is VNAV PTH?

A

Target FMC vertical speed

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18
Q

VNAV guidance becomes available at….ft?

A

400ft AGL

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19
Q

LNAV guidance becomes available at….ft?

A

50ft AGL

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20
Q

What are the bank angle limits of LNAV?

A

8 deg blow 200ft AGL

30 deg above 200ft AGL

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21
Q

What is the latest altitude you can engage the second A/P on the approach?

A

800ft RA

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22
Q

When APP is captured, what 3 things would disengage it?

A

TO/GA
Disengaging A/Ps and both FDs off
Retuning VHF nav

23
Q

What is the range in the altitude window!

A

0 - 50,000ft

24
Q

One revolution of the ALT knob will change altitude by how many feet?

A

6,400ft

25
Q

What does a green light on an MCP button mean?

A

That the selected mode can be deselected by pushing again.

26
Q

How many generators are required for a dual channel approach?

A

2

27
Q

With a dual channel approach with SINGLE CH displayed and after LOC capture, the G/S and LOC display should flash amber. What does this mean and what should happen next?

A

The pitch monitor confidence and ILS deviation monitor test has been passed after passing 1500ft RA

SINGLE CH is replaced by CMD

28
Q

If FLARE doesn’t arm by……ft RA, what should happen to the autopilot?

A

350ft RA

A/P should disconnect

29
Q

When will the A/T disengage on a dual channel approach?

A

2 seconds after touchdown

30
Q

During takeoff, the F/Ds command 15 deg nose up until sufficient ROC, then what will happen?

A

Will command MCP V2 + 20kt

31
Q

During takeoff, when will THR HLD be displayed?

A

84kt up to 800ft RA followed by ARM

32
Q

One push of TO/GA will give thrust for roughly what rate of climb on 2 engines?

What speed would you expect from the pitch commands?

A

1000-2000fpm

Manoeuvring speed for current flap setting at MTOW

33
Q

Engine failure during takeoff, what would be the pitch expected from the F/D?

A

13 deg

34
Q

Which 2 systems deal with windshear detection?

A

Weather Radar and GPWS

35
Q

What is the initial climb rate you would expect in a windshear escape manoeuvre?

A

+600fpm

36
Q

CWS rolls wings level and holds heading when control pressure is released, with a bank angle less that what…?

A

6 deg

37
Q

When will the A/P revert to CWS R/CWS P?

1.
2.
3.
4.

A
  1. In approach mode when VHF nav freq is detuned
  2. In LNAV/VNAV mode and FMC fails
  3. F/D only in use, with pitch or roll > half scale before selecting CMD A or B
  4. A roll or pitch mode was deselected.
38
Q

The CWS heading hold feature is inhibited when?

1.
2.
3.

A
  1. <1,500ft RA with gear down
  2. After LOC capture in APP mode
  3. After VOR capture with TAS <250kt
39
Q

When pressing an A/P disengage switch, what happens?

A

28V DC power to the FCC A, FCC B and MCP is stopped.

40
Q

How much force, when applied to the control column, would disengage the Autopilot with:

Channel A or B engaged?
Channels A and B engaged?

A

11kg approx

22kg approx

41
Q

With RA inoperative, the A/P would disconnect……seconds after LOC and G/S capture

A

2 seconds

42
Q

The Autoflight Status Annunciator (A/P P/RST) will show steady red under what conditions?

1.
2.
3.

A
  1. When stabiliser is out of trim below 800ft RA on dual channel approach.
  2. ALT ACQ mode is inhibited during A/P go-around if the stabiliser is not trimmed for single A/P operation.
  3. The automatic go-around system fails.
43
Q

What does a flashing amber Autoflight Status Annunciator (A/P P/RST) indicate?

A

That the A/P has reverted to CWS P or CWS R while in CMD

44
Q

The A/T will disengage when the thrust levers are apart by how much?

A

More than 10 deg apart

45
Q

During takeoff, V2 cannot be changed after passing what speed?

A

60kts

46
Q

If MCP alt is not lowered within 5nm prior to reaching top of descent point, what message will appear on the scratchpad?

A

RESET MCP ALT

47
Q

VNAV will limit speed to……kt when descending through FL100?

A

240kt

48
Q

VNAV will not allow descent below a speed restriction alt until the speed is….?

A

<10kt from the speed restriction

49
Q

In approach logic VNAV will continue descent when MCP alt is set above current alt by….?

A

More than 300ft

50
Q

FMA will show VNAV PTH when within 200ft of calculated descent path.
What will it be >200ft above?

200 ft or below?

A

VNAV SPD

VNAV PTH but commands V/S 0fpm

51
Q

What is the criteria to engage Approach Logic?

1)
or
2)
whichever occurs first

A

1) 2nm from first app waypoint
or
2) 2000ft above field elevation
whichever occurs first

52
Q

What does ADIRS stand for?

A

Air Data Inertial Reference System

53
Q

What is an ADIRS?

A

ADIRS combines the inertial reference units (IRU) and the air data computers (ADC) into one LRU ((Line Replaceable Unit) i.e. a quick replaceable modular component of an airplane).

B737-800 (6 decks)

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