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Boeing 757/767 > Automatic Flight > Flashcards

Automatic Flight Flashcards

1
Q

What AFDS modes are activated when turn F/D switch on

A

On Ground with AP disengaged: TO (takeoff) for both pitch and roll

Inflight with AP engaged: current selected AP modes

Inflight with AP disengaged: V/S for pitch and HDH HOLD for roll

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2
Q

When will FD steering indications display with switch in Off position

A
  • GA switch pushed
  • airspeed greater than 80 knts
  • flaps extended
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3
Q

When will A/T operate when switch is in ARM position

A
  • N1/EPR/THR, SPD, VNAV, FLCH or GA switch pushed

- SPD switch pushed and pitch mode is ALT HOLD, V/S, or G/S

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4
Q

When will LNAV engage

A
  • above 50’ RA

- within 2.5NM of active leg

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5
Q

When will LNAV deactivate

A
  • selecting HDG HOLD or HDG SEL
  • localizer capture
  • dual FMC failure
  • pushing LNAV switch a second time when LNAV is armed
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6
Q

When will localizer capture when LOC or APP armed

A

On intercept heading within 120º of localizer course

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7
Q

How to deactivate LOC mode after localizer capture

A
  • Selecting a roll mode other than LNAV
  • Pushing a GA switch
  • Disengaging the autopilot and turning both F/D switches OFF
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8
Q

When will glideslope capture when APP is armed

A

Within 80º of localizer course

*either loc or g/s can be captured first

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9
Q

Deselecting APP mode

A
  • With LOC captured and G/S armed, by selecting another roll mode other than LNAV; selecting LOC mode initiates a localizer approach
  • With G/S captured and LOC armed, by selecting another pitch mode other than VNAV
  • After LOC and G/S are captured, by selecting GA mode or disengaging the autopilot and turning both F/D switches OFF
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10
Q

Autoland status annunciations

A

LAND 3 - indicates all three autopilot systems are operating normally
LAND 2 - indicates a minimum of two autopilot systems are operating normally
NO AUTOLAND - Indicates fault conditions exist which preclude the use of the autopilots for an automatic landing
NO LAND 3 - Indicates a fault condition exists which results in a LAND 2 condition

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11
Q

Autothrottle active modes

A
  • EPR
  • FLCH
  • GA
  • IDLE
  • SPD
  • THR HOLD
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12
Q

AFDS active roll modes

A
  • ATT
  • B/CRS
  • GA
  • HDG HOLD
  • HDG SEL
  • LNAV
  • LOC
  • ROLLOUT
  • TO
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13
Q

AFDS active pitch modes

A
  • ALT CAP
  • ALT HOLD
  • FLARE
  • GA
  • G/S
  • SPD
  • TO
  • VNAV PTH
  • VNAV SPD
  • V/S
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14
Q

Pushing Autopilot disconnect switch

A

First push:
• Disconnects all autopilots
• A/P DISC and Master WARNING lights illuminate
• Displays the EICAS warning message AUTOPILOT DISC
• Sounds an aural warning

Second push - resets:
• The Master WARNING lights
• The EICAS warning message
• The aural warning

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15
Q

When is GA mode armed

A

Glideslope intercept or extension of wing flaps

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16
Q

Pushing Go Around switches

A
  • engages AFDS and autothrottles in GA mode
  • provides Windshear guidance in GA mode
  • activates FDs if in Off position
  • cancels all thrust derates if selected after takeoff
17
Q

Components of autoflight control system

A
  • automatic flight director system (AFDS)
  • autothrottle system
  • Mode Control Panel (MCP)
  • flight management computer (FMC)
18
Q

How does the autopilot operate flight controls

A
  • 3 (left, center, and right) flight control computers (FCCs) control separate hydraulically powered autopilot servos
  • control ailerons and elevators
  • rudder only controlled during multiple AP approach
  • nosewheel steering is controlled during ROLLOUT from an automatic landing
19
Q

Power source of FCCs

A

AC Bus 1 - Left and Center FCC
AC Bus 2 - Right FCC

*hot battery bus and STBY inverter - Center FCC during autoland operations

20
Q

How many FCCs are required for AP engagement

A
  • At least two FCCs

- updated FCCs only require one

21
Q

Failure affecting only the active autopilot mode

A
  • Autopilot remains engaged in an attitude stabilizing mode
  • An amber line is drawn through the mode annunciation
  • AUTO PILOT light illuminates
  • EICAS caution message AUTOPILOT displays
22
Q

At what altitude can the Autoland Status Annunciator (ASA) no longer make changes

A

Below 200 RA, except to indicate NO AUTOLAND

23
Q

LAND 3 vs LAND 2

A

LAND 3 - level of redundancy is such that a single fault cannot prevent the autopilot system from making an automatic landing (fail operational)

LAND 2 - level of redundancy is such that a single fault cannot cause a significant deviation from the flight path (fail passive) or prevent the autopilot system from making an automatic landing.

24
Q

Flight level change (FLCH) during climb or descents

A

Climb:

  • Aims to reach MCP altitude in 125 seconds
  • autothrottle will use reference N1 or EPR if unable to reach altitude within 125 seconds

Descent:
- mid-range N1 or EPR for small descents that can be reached within 125 seconds

25
Q

What does the AFDS command in GA mode

A
  • A/T will give max reference thrust to maintain at least 2000 fpm
  • roll steering will maintain ground track and mode engagement
26
Q

When does ROLLOUT become ARMED and ACTIVE

A
  • Armed below 1500’

- Active below 5’

27
Q

What does the AFDS command in TO mode

A
  • initially 8º pitch

After takeoff:

  • V2+15 or liftoff speed +15
  • limited to V2+25 or IAS/MACH window speed if greater than target
28
Q

What speed does the AFDS command in GA mode

A
  • IAS/MACH window speed or current speed, which ever is higher
  • limited to IAS/MACH window speed +25
29
Q

When does FLARE become armed and active

A

During AUTOLAND:
Armed - 1500’ RA
Active - 45’ RA (757); 50’ RA (767)

30
Q

Indications of Thrust Management Computer (TMC) failure

A
  • A/Ts disconnecting

* Thrust mode selection annunciation and Thrust Limit EPR indications removed from the EICAS Display

31
Q

Automatic A/T disconnect

A
  • fault detected in active autothrottle mode
  • reverse thrust raised to reverse idle
  • loss of engine data accompanying engine failure
  • loss of EPR command signal (RR)
32
Q

How does AFDS align sub mode operate?

A
  • activation not displayed
  • actuated at 500’ RA with LAND 2 or LAND 3
  • max 2º bank angle when crab greater than 5º
  • wing leveling when ROLLOUT engaged
33
Q

During AUTOLAND when is nose up trim automatically applied

A
  • During LAND 2

- 330’ RA

34
Q

Pitch commands during WINDSHEAR recovery

A

Pressing GA switch commands a pitch of 15º or slightly below pitch limit

35
Q

When is Climb Thrust Selected

A
  • automatically selected when VNAV, SPD, or FLCH selected after departure
  • manually via TMSP

Boeing 757/767 (19 decks)

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