FMS …
Flight Management System
The FMS (software and database) is embedded in …
DU 2 and 4
The FMS is mainly interfaced with …
2 MCDU
FMS makes predictions for … based on …
- time, fuel, weight
- 2 winds:
- – simplified: average between airports
- – accurate: insertion of 4 winds at different levels
The speeds computed by the FMS are continuously updated and available, according to the A/C …
Weight
Both FMS receives information such as :
- GPS signal
- Radio Navigation signal
- AHRS
- ADC
- RA
- FF
MCDU …
Multi-purpose Control Display Unit
MCDU allows access to the following systems :
- FMS (Flight Management System)
- RMS (Radio Management System)
- ACARS (Aircraft Communication Addressing and Reporting System)
- ACMS (Aircraft Condition Monitoring System)
FMC via MCDU have … modes of operation, and they are …
- 3 modes
- dual, independent, single
DTO is used for …
Direct to a point in the FPLN, or a new point can be inserted
PERF key gives access to the following pages :
- Take-off page
- Cruise page
- Approach page
RNP and ANP can be found in the …
PROG second page
M or T in the upper left corner of the MCDU, stand for …
Magnetic / True
BCP …
Best Computed Position
Font size on the Multi-purpose Control and Display Unit represents …
- Small - FMS computed data
- Large - manually entered data
ETE …
Estimated Time Enroute (remaining flight time until the corresponding fix)
EFOB …
Estimated Fuel On Board
Dead Reckoning uses information from …
dual ADC and dual AHRS
Position computations modes are …
- BCP (Best Computed Position)
- GPS
RNP …
Required Navigation Performance
System navigation position error =< the RNP value for 95% of the flight time.
FTE …
Flight Technical Error
FTE is …
A flight demonstrated value or a conservative value given by regulations.
The FTE with AP on is small relative to the usual RNP values. It may become relevant to RNP < 3.0 NM
HDOP …
Horizontal Dilution Of Precision
HDOP refers to …
The quality of the geometrical satellite constellation.
EPE = HDOP x measurement accuracy
