Auto Flight General Flashcards
What does the flight management guidance system FMGS consist of?
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
What are the functions of the flight management part of the fmgs?
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
What are the functions of the flight guidance part of the FMGS
The flight guidance (FG) part performs the following functions
auto pilot command
flight director command
auto trust command
What is the size of the navigation database?
5 MB
How frequently does a navigation database get updated
28 days
Who is responsible for acquiring updating loading and using the navigation data
The airline
How long does it take to update the navigation data
20 mins
5 mins if crossloaded from opposite FMGC
Which all data basis does the FMGC consist of?
- )The navigation database 2.)The airline modifiable information
- )The aircraft performance database
- )The magnetic variation database
- )Elements that can be used by the flight crew to create 20 waypoints 10 runways 20 NAV aids and five routes
How many modes of operation does the FMGS have and name them ?
There are four modes of operations.
They are:- dual mode independent mode Single mode back up navigation mode
What is the relation of Vs with V2 and Vref? And Vs and Vs1g?
Vs= 0.94 Vs1g
V2 = 1.2 Vs = 1.13 Vs1g Vref = 1.3Vs = 1.23 Vs1g
Name the different types of speeds
- )Characteristic speeds
- )limit speeds
- )protection speeds
- ) other speeds
Who calculated the characteristic speeds to be displayed on the PFD and the space to be displayed on the MCDU?
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.
If the GPS is disselected then when does the GPS is disselected message displayed on the MCDU?
80 nm before t/d
or
At approach phase transition
What are the types of holding patterns that the FMGC computes?
Hold to fix
hold to altitude
hold with manual termination
How many categories are there for data for vertical flight planning and what are they?
Three categories of data
strategic data
weather data
tactical data
To which type of way points can altitude speed or time constraint not be applied?
Go around waypoints
What are the flight requirements to calculate an optimum flight level?
The cruise flight level should be at least flight level 100 and cruise should last for at least five minutes
Above which altitude does Econ Mach get calculated and under Econ speed get calculated?
FL250
When does the PROG page show blank for optimum flight level?
In engine out conditions
What are the default altitudes that the history wind page gives winds for?
FL 050,150,250 and CRZ FL of the previous flight
When does the INIT B page title change from INIT to INIT FUEL PREDICTION ?
When the block Fuel is entered on the init B page
What is the speed displayed at the departure airport in F PLAN A?
V1 associated with runway elevation
After over flying the last waypoint of the go around procedure, what does the MCDU display show?
The alternate flight plan
In the alternate page, is the distance displayed the actual distance that you will fly or the shortest distance that you’ll fly?
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
What might happen if you enter a value in the preselect field of the MCDU PERF cruise page during the ALT CRZ* phase?
The FCU selected speed mirror word to Mach 0.01
When does the FMGS consider the aircraft to be in an engine out condition?
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
What is the speed target in engine out at takeoff or in the approach?
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
What are the functions of the flight augmentation computer and how many are there?
There are four main functions 1) Yaw function
2) flight envelope function
3) low energy aural alert function
4) windshear detection function
When is the Alpha floor inhibited?
Above M 0.6
