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Flashcards in FMS Deck (18):
1

Main functions of the FMS

Manage automatic navigation
Optimise fuel efficiency and performance
Generate information for the f/d displays

2

Different modes and functions of FMC

Dual - independent calculations, outputs compared a synchronised on both pilots displays

Independent

Single - failure mode, 1 FMC feeds both displays

3

FMC takes inputs from

Engine and fuel data
Navigation and performance databases
ADC
Nav aids
IRS
Airspeed, temp, alt
Air/ground sensing - notifies when airborne
Clocktime
Flap position
Fuel quantity sensors

4

Nav database

Contains nav info, normally seen on aprch plates
2 sets, updated every 28days
Pilot can Input temporary waypoints - erased when we land

5

Performance database

Contains info that’s normally found in the perf manual

Used to calc optimum pitch, speed and thrust control

Can’t be modified by the pilot - engineers can refine the performance factors

6

What would you find on the IDENT page

A/c type
Engine rating
Database update dates and serial numbers
Operation program

7

What would you find on the POS INIT page

Last position
Ref airport and gate

8

What would you find on the ROUTE page

Co route
Origin
Destination
R/y
FL no

9

What’s on the PERF page

Gross weight
ZFW
Cost index
Reserves
Cruising alt

10

What’s on the T/O page

V speeds
Flap setting
OAT
N1
TOW

11

What’s on the PROG page

XTRK error
VTRK error
H/wind
SAT
Fuel quantity

12

How is FMC position found out

Tunes to the closest nav aids that give a line of position crossing angle between 30 and 50 degrees

Combines radio position with IRS position to obtain FMC

Continually updates

13

Order of priority for selection of nav aids to find FMC pos

1st - 2 or more DME stations
2nd - DME/VOR
3rd - VOR
4th - LOC and co located DME
5th - LOC

14

FMC calc fuel data by

Totaliser system
- measures the mass of fuel in each tank and adds up all the values to find the mass

Calculated system
- measures the amount of fuel being consumed and takes it away fro the starting fuel

Both should be =

15

Typical data provided by the FMS

Lateral and vertical guidance
Present position
Time projections
Fuel projections
Altitude projections

16

If a high performance factor is entered into the FMC

Fuel use will be calculated to be very high

17

Purpose of the performance database is to

Calc optimum pitch, speed settings and thrust settings

18

Components of the FMC

Dual system including FMC, CDU and cross talk bus