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Systems 3 > FMS > Flashcards

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

A

Batt bus

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

A

6

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

A

White

25
Q

Upon powering up of the FMS what page is shown

A

IDENT

26
Q

What would cause an Amber “FMS FAIL” on the MFD with aural tone

A

FMS has failed
FMS data isnt correct
FMS is off

27
Q

What does route discontinuity mean

A

FMS doesnt know how to proceed between 2 waypoints

Systems 3 (9 decks)

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