Autoflight

Question 1

What does the FMGS contain?

Answer 1

2 FMGC
2 MCDU
1 FCU
2 FAC

Question 2

5 databases of the FMGC?

Answer 2

• Nav
• AMI Airline Modifiable Info
• Aircraft Performance (non-modi)
• Magnetic Variation
• Pilot modifiables (99 WPT etc)
• AMI contains PERF, IDLE, ACC alt, EOACC, AOC settingsC

Question 3

Can a CAT II/III (Autoland) approach be made with FMGCs in Independent Mode?

Answer 3

Yes, so long as both FG are valid.

AP can both be used, but will switch back to 1 AP for the MissAp, so the master FMGC should be valid and with up to date database.

Question 4

How many channels does the FCU have?

Answer 4

2- independent and redundant

Question 5

How long will a preselection remain on the FCU for?

Selectable FCU range for Speed?
What is one rotation worth?

Selectable FCU range for altitude and VS?

Answer 5

45 sec
10 sec for speed

100-399 / 0.1-0.99
32 units

100- 49000ft
±6000 fpm / ±9.9º

Question 6

Does the ATHR button illuminate when armed as well as active

Answer 6

Yes, both

Question 7

Why are V2 = 1.13 VS1G and VREF 1.23 VS1G?

Answer 7

As Airbus use a different stall speed to the regulators, VS1G.

VS = 0.94 VS1G

V2 = 1.2 × 0.94 VS1G = 1.13

VREF 1.3 × 0.94 VS1G = 1.23

Question 8

What are the three values of VLS?

When does a correction apply and why?

Answer 8

1.13 in TO/GA (=V2)
1.23 after initial flap retraction
1.28 when clean

Above FL200, to maintain 0.2g buffet margin

Also increases with speedbrake deflection

Question 9

What is the value of F speed in
relation to VS1G?

and S speed?

Answer 9

1.18-1.22 VS1G (of Conf 1+F)

Minimum flap retraction speed
Used as target when in Conf 2 or 3

1.22-1.25 VS1G (of Conf 1+F)
Minimum slat retaction speed
Used as target when in Conf 1

Question 10

What are the three uses of green dot?

How do you calculate it roughly?

Answer 10

Best lift:drag ratio
OEI operating speed (clean)
Final take-off speed

2× weight (T) + 85kt
(add a knot per 1000’ above FL200)

Question 11

What is VA?

Answer 11

Max Design Manoeuvring Speed

Maximum speed for full control deflection in alternate / direct law

Question 12

Difference between VMCG, VMCA, VMCL

Answer 12

Minimum control speed in OEI, one engine at TO thrust.

VMCG- on ground
VMCA- in air, max 5º bank
VMCL - final config for landing

Question 13

Limitations
Autopilot minimum alts?

Answer 13

Takeoff- 100 RA and 5 sec (100 RA for manual go around)
Final app- 250 RA
Circling- 500 RA
ILS 160 RA
Autoland 0RA
PAR 250 RA
Other phases 500RA

Question 14

Limitations

When can NAV mode be used

Take off (no GPS PRIM)
TMA (no GPS PRIM)
Overlay (no Navaid)
RNAV approach (no GPS PRIM)

Answer 14

May use if GPS primary lost so long as FMGS TO updating was performed

May use in TMA in RNP HIGH or raw data used to crosscheck

Overlays- navaid may be u/s GPS PRIM and if operationational approval obtained

RNAV approach- wihtout GPS PRIM if HIGH accruacy and operational approval

Question 15

Limitations
How many AP in Cat II / III a / III b?
When must A/THR be used?

What limitations on OEI on Cat II / III Single?

Min/max GS angle for autoland?

Answer 15

1 AP except Cat III dual (2)

A/THR must be used in Cat III single

CONF 3 / FULL only
Engine out procs completed by 1000

-2.5 to 3.25º