Automatic Flight

Question 1

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

Answer 1

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

Question 2

When will FD steering indications display with switch in Off position

Answer 2

• GA switch pushed
• airspeed greater than 80 knts
• flaps extended

Question 3

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

Answer 3

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

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

Question 4

When will LNAV engage

Answer 4

• above 50’ RA

- within 2.5NM of active leg

Question 5

When will LNAV deactivate

Answer 5

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

Question 6

When will localizer capture when LOC or APP armed

Answer 6

On intercept heading within 120º of localizer course

Question 7

How to deactivate LOC mode after localizer capture

Answer 7

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

Question 8

When will glideslope capture when APP is armed

Answer 8

Within 80º of localizer course

*either loc or g/s can be captured first

Question 9

Deselecting APP mode

Answer 9

• 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

Question 10

Autoland status annunciations

Answer 10

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

Question 11

Autothrottle active modes

Answer 11

• EPR
• FLCH
• GA
• IDLE
• SPD
• THR HOLD

Question 12

AFDS active roll modes

Answer 12

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

Question 13

AFDS active pitch modes

Answer 13

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

Question 14

Pushing Autopilot disconnect switch

Answer 14

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

Question 15

When is GA mode armed

Answer 15

Glideslope intercept or extension of wing flaps

Question 16

Pushing Go Around switches

Answer 16

• 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

Question 17

Components of autoflight control system

Answer 17

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

Question 18

How does the autopilot operate flight controls

Answer 18

• 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

Question 19

Power source of FCCs

Answer 19

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

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

Question 20

How many FCCs are required for AP engagement

Answer 20

• At least two FCCs

- updated FCCs only require one

Question 21

Failure affecting only the active autopilot mode

Answer 21

• 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

Question 22

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

Answer 22

Below 200 RA, except to indicate NO AUTOLAND

Question 23

LAND 3 vs LAND 2

Answer 23

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.

Question 24

Flight level change (FLCH) during climb or descents

Answer 24

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

Question 25

What does the AFDS command in GA mode

Answer 25

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

Question 26

When does ROLLOUT become ARMED and ACTIVE

Answer 26

- Armed below 1500’ | - Active below 5’

Question 27

What does the AFDS command in TO mode

Answer 27

- initially 8º pitch After takeoff: - V2+15 or liftoff speed +15 - limited to V2+25 or IAS/MACH window speed if greater than target

Question 28

What speed does the AFDS command in GA mode

Answer 28

- IAS/MACH window speed or current speed, which ever is higher - limited to IAS/MACH window speed +25

Question 29

When does FLARE become armed and active

Answer 29

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

Question 30

Indications of Thrust Management Computer (TMC) failure

Answer 30

* A/Ts disconnecting | * Thrust mode selection annunciation and Thrust Limit EPR indications removed from the EICAS Display

Question 31

Automatic A/T disconnect

Answer 31

- 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)

Question 32

How does AFDS align sub mode operate?

Answer 32

- 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

Question 33

During AUTOLAND when is nose up trim automatically applied

Answer 33

- During LAND 2 | - 330’ RA

Question 34

Pitch commands during WINDSHEAR recovery

Answer 34

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

Question 35

When is Climb Thrust Selected

Answer 35

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