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B777 CATHAY STUDY GUIDE > AUTOPILOT > Flashcards

AUTOPILOT Flashcards

1
Q

Describe how the AFDS controls the elevators, ailerons and rudder?

A

Through the fly-by-wire flight control system. Sends input directly to the PFCs via the AFDCs and then to the ACEs to the PCUs

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2
Q

Which Surface commands are added only during an autopilot approach and landing?

A

The rudder

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3
Q

Which autopilot modes have an arming phase?

A

Roll modes: LNAV, LOC, ROLLOUT
Pitch modes: VNAV, G/S, FLARE

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4
Q

Which autopilot mode cannot be disengaged by selection of another mode?

A

APP mode after LOC or G/S capture

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5
Q

After an ILS capture and above 1’500 ft, what happens if APP mode is reselected?

A

APP mode deselects and AFDS reverts to default roll & pitch modes

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6
Q

When will override of rudder pedals cause autopilot disengagement?

A

Only with LAND 2 or LAND 3 annunciated

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7
Q

How does the autopilot react to engaged mode degradation?

A

Remains engaged in an attitude stabilizing mode initially

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8
Q

How is the flight director affected by an initial mode degradation?

A

F/D initially command an attitude stabilizing command based on inertial data

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9
Q

With the F/D off, will a TOGA selection cause them to appear?

A

Yes, if speed is over 80kts and flaps are out of UP

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10
Q

How is the F/D affected by overspeed or stall?

A

F/D bars will disappear

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11
Q

What two occasions will cause a green box to appear around an FMA mode?

A
  1. When a mode is first activated/engaged(green box appears for 10s)
  2. When amber line through a degraded mode is removed
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12
Q

What is the A/T controlling to when THR is annunciated?

A

A/T applies thrust to maintain V/S REQD by pitch mode

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13
Q

At what distance to an active route leg will LNAV engage, if armed?

A

2,5 nm

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14
Q

What are the conditions for the roll mode ATT to engage?

A

When A/P is engaged and both F/D:s are OFF and bank angle is more than 5 degrees.

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15
Q

When is TOGA mode armed in flight?

A

Whenever flaps are out or G/S captures

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16
Q

When does ROLLOUT mode engage?

A

Below 2 ft RA on landing

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17
Q

What are the bank angle limits in ATT mode?

A

5-30 deg
Less than 5 deg = rolls back to level
More than 30 deg = Rolls back to 30 deg

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18
Q

After take-off, what is the target speed?
When will the higher speed limit be used?

A

V2+15 up to 25 kts
If speed is above V2+15 for more than 5 sec then speed is reset to a max of V2+25

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19
Q

Where does the AFDS get the V2 speed; MCP or CDU?

A

AFDS uses the speed set in the MCP IAS/MACH window

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20
Q

When will VNAV engage if armed for T/O?

A

At 400 ft

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21
Q

After an altitude conflict, how is VNAV ALT mode cancelled?

A

By changing the altitude value set in the MCP ALT window and pushing the ALT selector, or changing the pitch mode

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22
Q

When does FLARE mode engage?

A

During autoland between 60-40 ft RA

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23
Q

Can the A/T be operated without the flight director or autopilot?

A

Yes, but only in THR REF, SPD, HOLD or IDLE modes

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24
Q

Can the A/T engage automatically?

A

Yes, if armed and no AP or F/D is active

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25
Q

Can the A/T be engaged if only one servo motor is serviceable?

A

Yes

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26
Q

In which thrust mode will the A/T not reposition the thrust levers?

A

HOLD mode

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27
Q

What action causes a normal A/T disconnection during landing?

A

When either thrust reverser lever is raised to reverse or thrust levers are manually overridden during a manual landing

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28
Q

What are the initial TOGA F/D commands upon engagment?

A

Pitch command is 8 deg nose up
Roll command is wings level

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29
Q

During take-off, when can the TOGO switches be used for A/T engagement?

A

Speed less than 50 kts on T/O roll or above 400 ft(if not activated by 50 kts)

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30
Q

What does selection of TOGA above 80 kts do?

A

Disarms LNAV and VNAV

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31
Q

What type of altitude is used for LNAV and VNAV engagements?

A

LNAV: 50 ft RA
VNAV: 400 ft above rwy elevation

32
Q

What is the maximum speed commanded after lift off, if an engine fails?

A

V2 to V2+15 kts

33
Q

What does a TOGA selection do immediately after T/O?

A

Removes T/O and climb derates and assumed temp reduction.
A/T actives in THR REF

34
Q

What is the pitch speed command at acceleration altitude?

A

5 kts below T/O flap placard speed of the commanded flap position

35
Q

What is the VNAV climb speed when in clean configuration?

A

Speed transition associated with origin Airport or VREF+80kts, whichever is higher

36
Q

What is the A/T mode for a single push go-around?

A

THR

37
Q

After a go-around, how can TOGA be terminated below 400ft

A

Below 400 ft: disengage AP and then turn off both F/D:s or automatic LNAV activation

38
Q

After reaching the missed approach altitude, what is the auto throttle mode?

A

SPD

39
Q

What are the 3 forms of autopilot envelope protection?

A

Stall protection
Overspeed
Bank angle

40
Q

What are the roll and pitch modes that engages when A/P is engaged and the F/D:s are OFF?

A

Roll mode: HDG/TRK Hold or ATT (if bank over 5 deg)
Pitch mode: V/S or FPA

41
Q

When will the F/D:s automatically display, even if the F/D switches are off?

A
  1. TO/GA is pushed and airspeed is greater than 80 kts
  2. On a go-around with the flaps not retracted
42
Q

Below what altitude is the CLB/CON thrust switch inoperative?

A

Below 400 ft during takeoff

43
Q

What happens in the system when the CLB/CON thrust switch is pushed?

A
  1. With 2 engines it changes the engine thrust limit to the FMC selected climb thrust
  2. With 1 engine it changes the engine thrust limit to maximum continous
44
Q

When does the MCP speed window change from IAS to MACH?

A

At 0,84 Mach during climb

45
Q

When does the MCP speed window change from MACH to IAS?

A

At 310 kts during descent

46
Q

What speed is displayed in the MCP speed window when power is first applied to the aircraft?

A

200 kts

47
Q

What is displayed in the MCP Heading/Track Window when power is first applied to the aircraft?

A

360

48
Q

What is the selectable range for the Vertical Speed?

A

-8000 to +6000 fpm

49
Q

What is the selectable range for the FPA?

A

-9,9 to +9,9 degrees

50
Q

What is displayed in the MCP Altitude Window when power is first applied to the aircraft?

A

10’000 ft

51
Q

Within what angle do you have to be to get Localizer capture?

A

Within 120 degrees of the localizer course

52
Q

How can LOC mode be disarmed before LOC capture?

A
  1. By pushing the LOC switch a second time
  2. By arming or activating LNAV
53
Q

How can LOC mode be disarmed after LOC capture?

A
  1. Selecting a roll mode other than LNAV
  2. Pushing the TO/GA switch
  3. Disengaging the A/P and turning both F/D:s off
  4. Pushing the LOC switch a second time as long as you are above 1’500 ft RA
54
Q

With APP mode armed, can G/S capture happen before LOC capture?

A

No, it is inhibited

55
Q

Within what angle do you have to be to get G/P capture?

A

Within 80 degrees of the LOC course

56
Q

How can APP mode be disarmed for any status of the LOC and G/S combination?

A

By disengaging the A/P and turning both F/D:s off

57
Q

How can APP mode be disarmed with both LOC and G/S armed?

A

By pushing APP, LOC, LNAV or VNAV

58
Q

How can APP mode be disarmed with LOC and G/S capture?

A

By pushing TO/GA

59
Q

How can APP mode be disarmed with LOC capture and G/S armed?

A

By pushing HDG/TRK SEL or HDG hold

60
Q

How and when can the APP mode be deselected above 1500ft without disengaging the A/P?

A

By pushing the APP switch above 1500 ft RA

61
Q

What is the initial climb speed after a normal takeoff?

A

V2+15 to V2+25

62
Q

What climb rate is the TO/GA system aiming for after a go-around on approach, and what thrust mode is displayed on the FMA?

A

2’000 ft/min and THR is displayed

63
Q

On a go-around, what does a second push of the TO/GA switches accomplish?

A

It activates the A/T in THR REF

64
Q

Which barometric source does the AFDCs use for baro correction?

A

The side on which the A/P was engaged.
On ground when both F/Ds are switched on the Captains source is used and an L is displayed in the lower right corner of the PFD

65
Q

Describe how the electrical system is divided to support LAND 3 AUTOLAND

A

There are 3 sets of critical autoland components. Each set contains:
- ILS (AC)
- Radio Altimeter (AC)
- AFDC (DC)
- ILS antenna switch (DC)

The left set is powered by L AC XTFR BUS and L DC MAIN BUS with the L IDG as source

The center set is powered by the STBY AC BUS and the BATTERY BUS with the R IDG as source

The right set is powered by the R XTFR BUS and R DC MAIN BUS with the R BACK UP GEN as source

66
Q

Where are the inputs from the MCP sent to?

A

Inputs on the MCP is sent to the three ADFCs, they provides control of the F/Ds and A/P. Signals are sent from the AFDCs to the PFCs

67
Q

In what three ways can the autopilot be disengaged?

A

Autopilot can be disengaged by :
1. Using the control wheel A/P disengage switch
2. Use the MCP autopilot disengage switch
3. Overriding with the control column or rudder pedals (pedals will only disengage the autopilots with LAND 2 or LAND 3 annunciated)

68
Q

What does the EICAS message “AUTOPILOT” mean?

A

the EICAS caution message “AUTOPILOT” displays to indicate that the autopilot is in a degraded mode.

69
Q

Describe how the auto throttle provides stall protection if not active?

A

The A/T can automatically activate to provide stall protection when armed but not active. If speed decreases to near stick shaker activation, the A/T automatically activates in SPD mode and advances thrust to maintain minimum maneuvering speed (MMS) or the speed set in the MCP speed window, whichever is greater.

70
Q

What is the target speed if an engine failure occurs on the ground?

A

If an engine failure occurs on the ground, the pitch command target speed at lift-off is V2 or the airspeed at lift-off, whichever is greater

71
Q

What is a requirement for FLARE mode to be armed?

A

Flare can be armed when LAND 3 or LAND 2 is annunciated on the PFD

72
Q

In the ROLLOUT mode, what does the autopilot control to track the centerline?

A

The autopilot controls the rudder and nosewheel steering to keep the aircraft on the centerline.

73
Q

When will ROLLOUT mode disengage?

A

Rollout guidance continues until the autopilots are disengaged.

74
Q

What happens to rudder control during an automatic go-around?

A

During a go-around from a LAND 2 or LAND 3 approach, automatic LNAV activation causes disengagement of the autopilots control over the rudder. If executing an engine out missed approach with TAC inoperative, manual rudder inputs will be required.

75
Q

How do you terminate TO/GA mode below and above 400 ft RA?

A

To terminate TO/GA mode:
- Above 400 ft RA, select a different roll or pitch mode
- Below 400 ft RA, disengage A/P and turn off both F/D

76
Q

What pitch up degree is commanded when pushing a TO/GA switch during a go-around?

A

Pushing a TO/GA switch commands a pitch-up of 15 deg or slightly below the pitch limit, whichever is lower. As rate of climb increases, the AFDS transitions from pitch to airspeed control.

B777 CATHAY STUDY GUIDE (24 decks)

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