Automatic Flight Control and Augmentation System

Question 1

How man flight control computers are there?

Answer 1

2 or 3

Question 2

Which FCC serves which side?

Answer 2

1 serves left, 2 serves right FD and AP.

Question 3

What is the effect of FCC failure?

Answer 3

Alert 1
AP disengaged (in flight), FD disappears, amber FD at PFD, amber fault light on the FCC pb

Question 4

How many IRS’s are required for AP engagement?

Answer 4

2 (in NAV or ATT)

Question 5

How can you disengage the autopilot?

Answer 5

via disengage button on control column. the disconnect bar on FMP

Question 6

In HDG HOLD mode, how do you obtain a new heading?

Answer 6

by setting a new heading and then pulling heading control knob.

Question 7

How do you activate V/S mode?

Answer 7

by rotating the VS wheel or upon AP/FD engagement when not in TO mode.

Question 8

In ALT HOLD mode, how do you obtain a new altitude?

Answer 8

pre set value, then select vertical mode (VS, LVLCH or pulling alt control knob [when not in PROF])

Question 9

How can you activate LVLCH?

Answer 9

By pressing LVLCH pb or pulling alt control knob [when not in PROF]

Question 10

What is the difference in aircraft reaction between VS and LVLCH?

Answer 10

VS is more prompt, LVLCH is slow to ensure passenger confort.

Question 11

In V/L mode, when does the VOR capture occur?

Answer 11

turn to the required intercept heading using HDG and press V/L. Captures at approx half a dot.

Question 12

In APP mode, when is the localizer captured?

Answer 12

2 dots deflection

Question 13

How can you set up a NAV capture?

Answer 13

select intercept heading and arm NAV by pressing NAV pb

Question 14

When cruising in PROF mode, what must you do to initiate descent?

Answer 14

set the FMP altitude to lower or higher (pending the profile).

Question 15

In LAND mode, what is the difference between LAND and LAND2?

Answer 15

LAND will arm LOC and GS to capture and track a ILS localiser and glide-slope.
LAND 2 is auto land using two ILSs

Question 16

How do you arm LAND mode?

Answer 16

press LAND pb.

Question 17

What limit is there to localizer and glide slop capture?

Answer 17

if intercept is more then 90 degrees. GS capture can only occur after LOC capture.

Question 18

How do you select GA mode? What should happen?

Answer 18

TOGA triggers

Question 19

How do you engage TO mode? How should the aircraft be aligned?

Answer 19

pull TOGA triggers for approx one second. ACFT must be aligned with runway centreline.

Question 20

Which pitch angles will be displayed during take-off in TOGA mode?

Answer 20

10 degrees pitch up

Question 21

How many ATS channels are there and what do they drive?

Answer 21

2 channels as part of FAC

Question 22

What happens if one ATS channel fails?

Answer 22

the other channel will drive both thrust levers via a clutch tie.

Question 23

How is ATS engaged? disengaged?

Answer 23

on ground. armed via ATS pb and engages when TOGA triggers are pulled.
In flight, ATS pb.
Automatically with alpha mode is active or when TOGA triggers are pulled.

to disengage, pressing either ATS disconnect on the trust levers. automatically at touch down or in RTO with reverse thrust.

Question 24

Can you override the ATS?

Answer 24

Yes, normal force.

Question 25

Why does the ATS declutch at 80kts? How do you know it has done so?

Answer 25

to prevent accidental thrust lever retardation during critical stage of takeoff.
indicated by two WHITE D’s adjacent to the EPR tapes.

Question 26

What precautions should you take with the ATS if taking off into a strong headwind?

Answer 26

engine should be manually accelerated to 1.3 EPR before pulling TOGA to prevent possible early declutch.

Question 27

How is the stabilizer trimmed automatically, manually and if both FAC channels fail?

Answer 27

automatically by FAC with AP on. manually by by pilot (AP off), ad mach trim compensation.
if fails, via trim wheel.

Question 28

What is the effect of operating only one half of the stab trim switch?

Answer 28

if more then 15seconds, the trim switch will disconnect

Question 29

What happens if the pilots operate the trim switches in opposite directions?

Answer 29

nothing, no trim takes place.