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Flashcards in Autoflight Deck (10)
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1
Q

FMS can calculate position by 3 different methods. What are they?

A

MIX IRS:
• average position of the 3 IRS positions calculated by accelerometers

Radio:
• position based on precise radio fixes

GPS:
• exact position calculated by 2 GPS satellites

The a/c will use most accurate which is GPS

2
Q

What is meant by position BIAS?

A

It’s added to the mix IRS position using the GPS or radio position so that if GPS is lost, it has an accurate starting position

3
Q

When does the energy circle display on the ND? What is it?

A

Appears in HDG/TRK mode

Shows distance required to complete a landing from present position

4
Q

How does FMS detect engine out condition?

A
  • Engine master switch OFF
  • Engine N2 below idle
  • one thrust lever below 5* and the other above 22*
  • FADEC detects engine fault
5
Q

If EO CLR is pressed by mistake what happens?

A

System assumes 2 engine ops again and single engine performance figures cannot be recovered

6
Q

What is EO REC MAX calculation based on?

A

Aircraft weight

It’s the max altitude a/c can fly with MCT set and maintain level flight

7
Q

How many channels does auto thrust have?

A

2…one per FMGC

8
Q

When does THRUST LOCK appear and how do you recover?

A

Only occurs when thrust levers are set in CLB or MCT gate and auto thrust is on.

Move thrust lever donuts to where the actual thrust is

9
Q

What is RETARD mode?

A

Active during auto land when idle thrust is commanded and activates at 40ft. Calls out RETARD at 20ft on manual landing and 10ft on auto land

10
Q

How many FACs are there? What functions do they perform?

A

2 FACs
• yaw functions (damping, turn coordination, rudder travel limiter)
• low energy warning
• windshear detection
• PFD speed scale & speed calculations
• flight envelope calculations