Auto Flight General

Question 1

What does the flight management guidance system FMGS consist of?

Answer 1

The flight management guidance system consists of the following units :-

Two flight management guidance computers
Two multipurpose control and display units
one flight control unit
Two flight augmentation computers

Question 2

What are the functions of the flight management part of the fmgs?

Answer 2

The flight management (FM) part controls the following functions:-
navigation and management of navigation radios
management of flight planning
prediction and optimization of performance
display management

Question 3

What are the functions of the flight guidance part of the FMGS

Answer 3

The flight guidance (FG) part performs the following functions
auto pilot command
flight director command
auto trust command

Question 4

What is the size of the navigation database?

Answer 4

5 MB

Question 5

How frequently does a navigation database get updated

Answer 5

28 days

Question 6

Who is responsible for acquiring updating loading and using the navigation data

Answer 6

The airline

Question 7

How long does it take to update the navigation data

Answer 7

20 mins

5 mins if crossloaded from opposite FMGC

Question 8

Which all data basis does the FMGC consist of?

Answer 8

1. )The navigation database 2.)The airline modifiable information
2. )The aircraft performance database
3. )The magnetic variation database
4. )Elements that can be used by the flight crew to create 20 waypoints 10 runways 20 NAV aids and five routes

Question 9

How many modes of operation does the FMGS have and name them ?

Answer 9

There are four modes of operations.

They are:-
dual mode 
independent mode
Single mode
 back up navigation mode

Question 10

What is the relation of Vs with V2 and Vref? And Vs and Vs1g?

Answer 10

Vs= 0.94 Vs1g

V2 = 1.2 Vs = 1.13 Vs1g
Vref = 1.3Vs = 1.23 Vs1g

Question 11

Name the different types of speeds

Answer 11

1. )Characteristic speeds
2. )limit speeds
3. )protection speeds
4. ) other speeds

Question 12

Who calculated the characteristic speeds to be displayed on the PFD and the space to be displayed on the MCDU?

Answer 12

On the PFD the calculation is done by the FAC based on aerodynamic data.

On the MCDU, the calculation is done by the FMS based on the aircraft gross weight or the predicted gross weight.

Question 13

If the GPS is disselected then when does the GPS is disselected message displayed on the MCDU?

Answer 13

80 nm before t/d

or

At approach phase transition

Question 14

What are the types of holding patterns that the FMGC computes?

Answer 14

Hold to fix
hold to altitude
hold with manual termination

Question 15

How many categories are there for data for vertical flight planning and what are they?

Answer 15

Three categories of data

strategic data
weather data
tactical data

Question 16

To which type of way points can altitude speed or time constraint not be applied?

Answer 16

Go around waypoints

Question 17

What are the flight requirements to calculate an optimum flight level?

Answer 17

The cruise flight level should be at least flight level 100 and cruise should last for at least five minutes

Question 18

Above which altitude does Econ Mach get calculated and under Econ speed get calculated?

Answer 18

FL250

Question 19

When does the PROG page show blank for optimum flight level?

Answer 19

In engine out conditions

Question 20

What are the default altitudes that the history wind page gives winds for?

Answer 20

FL 050,150,250 and CRZ FL of the previous flight

Question 21

When does the INIT B page title change from INIT to INIT FUEL PREDICTION ?

Answer 21

When the block Fuel is entered on the init B page

Question 22

What is the speed displayed at the departure airport in F PLAN A?

Answer 22

V1 associated with runway elevation

Question 23

After over flying the last waypoint of the go around procedure, what does the MCDU display show?

Answer 23

The alternate flight plan

Question 24

In the alternate page, is the distance displayed the actual distance that you will fly or the shortest distance that you’ll fly?

Answer 24

If there is no company route present in the database for the destination and alternate pairing, then it will show the great circle distance.

If there is a route defined , then it will show the actual track miles for the flight

Question 25

What might happen if you enter a value in the preselect field of the MCDU PERF cruise page during the ALT CRZ* phase?

Answer 25

The FCU selected speed mirror word to Mach 0.01

Question 26

When does the FMGS consider the aircraft to be in an engine out condition?

Answer 26

1) 1 Engine master switch off for CFM engines
2) N2 below idle
3) One thrust lever angle is below 5° while the other is above 22°
4) FADEC shows an engine fault

Question 27

What is the speed target in engine out at takeoff or in the approach?

Answer 27

For Takeoff the speed target is V2 or the current speed limited to a maximum of V2+15.

For approach, speed target is Vapp or current speed limited to a maximum of VLS +15

Question 28

What are the functions of the flight augmentation computer and how many are there?

Answer 28

There are four main functions 1) Yaw function

2) flight envelope function
3) low energy aural alert function
4) windshear detection function

Question 29

When is the Alpha floor inhibited?

Answer 29

Above M 0.6