FMS Flashcards

1
Q

Fundamentally, what is an FMS

A

A multi-purpose performance and navigation computer

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2
Q

What are the 4 main things it provides

A
  • Flight planning and Nav info
  • Performance Calculations and Optimisation
  • Long term guidance targets
  • Information displays on Electronic Flight Instrument System (EFIS)
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3
Q

How many databases does the FMC normally consistent of and what are they

A
4
NAV
PERFORMANCE 
Magnetic Variation 
Pilot stored elements
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4
Q

How does the FMS NAV system determine position

A

GPS
IRS
ground based nav aids

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5
Q

When the FMS determines aircraft position, does it use a singular source or more than one. If more than one, whats it called

A

More than 1. Hybrid

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6
Q

On the pc21 what nav mode does the FMS prioritise, and how many sources are used

A

GPS (average of 2 gps positions)

Dme/ dme
Vor/dme
Irs
Dead reckoning

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7
Q

What is the definition of RNP

A

Aircraft nav accuracy must be able to calculate within 95% of actual position

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8
Q

What are the 2 functions common to all FMS

A

Auto nav

Flightpath management

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9
Q

What provides an interface between FMS and aircrew

A

CDU

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10
Q

What are the 3 main functions of the PC21 FMS

A

Area nav
Backup tuning
Backup volume control

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11
Q

Are the 2 FMS in the PC21 identical

A

Yes

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12
Q

When is the EXEC Annunciator illuminated

A

When the user is prompted to execute/ accept the modification to the active route

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13
Q

How many LSKs are on the FMS

A

12

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14
Q

How is the brightness adjusted on the FMS

A

INT LIGHT panel, display rotary DISPLAYS control

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15
Q

Do the FMS operate individually or in tandem

A

Tandem

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16
Q

The FMS recieves data from what sources

A
  • GLSSU 1 & 2
  • 2 X VOR/ILS recievers
  • TACAN (DME Data)
  • ADC
  • IRS
  • PFD (reversionary SFD air data)
17
Q

Where is the primary display of FMS data

A

HSI, in map mode of PFD

18
Q

What poweres both FMS

19
Q

Does the FMS have to be manually turned on when external power is supplied

A

No, its auto

20
Q

What 3 phases of flight does the FMS compute and monitor.

A

Enroute
Departure & arrival
Approach

21
Q

What are the RNP values for the 3 stages of flight (terminal, enroute, approach)

A
Terminal = 1.0NM
Enroute = 2.0NM
Approach = 0.3NM
22
Q

Up to how many DME stations can be used to triangulate position in DME/DME

23
Q

What would be shown on the FMS if:

  • Pilot action is required
  • loss of functionality
  • Degraded mode of operation
A

Yellow system alert message

24
Q

What colour are maintenance messages

25
Upon powering up of the FMS what page is shown
IDENT
26
What would cause an Amber "FMS FAIL" on the MFD with aural tone
FMS has failed FMS data isnt correct FMS is off
27
What does route discontinuity mean
FMS doesnt know how to proceed between 2 waypoints