flight Management system

Question 1

primary uses of FMS and its interface with MCDU

Answer 1

The FMS consists of Flight Management function(FMF) 1 and 2(provided by VIAs) and two MCDU’s installed in left and right side forward pedestal
Pilot uses the FCP to select flight modes and the MCDU to enter flight plans and other flight data Flight progress is monitored on through the MCDU and the EIS (electronic instrument system) After data entry the FMF’s generate a flight profile from the origin to destination airport. The fmf’s then guide the airplane along that path by providing roll,pitch,speed and thrust commands to the FCC’s

Question 2

cautions associated with the FMS

Answer 2

 All data entered into the FMS is advisory only and must be confirmed to
be accurate and current by comparison to published and approved
flight plan navigation charts and approach plates.
 The flight crew is responsible for assuring accuracy of the strung FMS
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flight plan. All entries and edits to the FMS flight plan must be
confirmed to be in compliance with ATC clearances, both laterally and
vertically.

Question 3

primary and secondary modes of the FMS

Answer 3

Dual, Independent, and Standby modes
Dual is normal mode,
Cross talking between VIA’s to ensure following
1) MCDU entries made on one side are entered simultaneously into the other VIA
2)respective MCDU can display different pages
if the same pages is displayed predicted values may be slightly different. (FMS is a function of the VIA)
3) During normal ops advisory messages may be displayed on one or both, Both MCDU’s should be monitored during flight.

Question 4

the relationship between the alignment of the IRS and the FMS

Answer 4

1) must be parked until procedure is complete and NAV OFF lights extinguish
2) IRS mode selectors NAV
3) Alignment time is 10 min
4) NAV OFF lights will flash if ADIRU does not receive present position initialization within 10 min of position mode selectors to NAV