Flight Control Computer Systems Quiz

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Questions and Answers

What is the primary function of the PRIM computers on the A330?

  • Provide navigation data to the flight crew
  • Control normal, alternate, and direct control laws (correct)
  • Perform redundancy checks on systems
  • Manage cabin pressure and temperature

In normal operation, which PRIM computer is designated as the master?

  • S1
  • P3
  • P2
  • P1 (correct)

What happens if the master PRIM computer (P1) fails?

  • P2 takes over as the new master (correct)
  • P3 will replace P1 regardless of its status
  • All SEC computers will become active
  • The flight crew must take manual control

What role do the SEC computers play in the flight control system?

<p>Control direct laws and provide redundancy for yaw damping (C)</p> Signup and view all the answers

What occurs when all PRIM computers fail on the A330?

<p>One SEC computer can take complete control (C)</p> Signup and view all the answers

What happens to the master computer when the green hydraulic system is lost?

<p>P2 takes over as the master computer. (B)</p> Signup and view all the answers

Which computer assumes control when P1 is unable to function?

<p>P2 replaces P1 as the master computer. (A)</p> Signup and view all the answers

When P1 fails, what is expected from P2 in the system?

<p>P2 takes over the responsibilities of P1. (A)</p> Signup and view all the answers

What do the FCDCs do with the data acquired from the PRIMs and SECs?

<p>They send it to the EIS and CMC. (A)</p> Signup and view all the answers

What does the message 'RUD TRV LIM' indicate when displayed on the INOP SYS ECAM status page?

<p>One FCDC does not detect its ground condition. (D)</p> Signup and view all the answers

What causes the 'RUD TRV LIM' message to disappear on the INOP SYS ECAM status page?

<p>The rudder control is pressurized by hydraulic. (B)</p> Signup and view all the answers

What situation triggers the activation of the Backup Control Module (BCM) computer? 330-300

<p>Total electrical failure (C)</p> Signup and view all the answers

What is the main function of the BCM's independent unit during its activation? 330-300

<p>Provide yaw damping and rudder command (C)</p> Signup and view all the answers

Which hydraulic system supplies the Backup Power Supply (BPS) for the BCM? 330-300

<p>B or Y hydraulic system (A)</p> Signup and view all the answers

What type of sensors does the BCM include for its operation? 330-300

<p>Gyrometers and pedal deflection sensors (A)</p> Signup and view all the answers

What is the consequence of BCM activation regarding turn coordination? 330 -300

<p>Turn coordination is disabled (D)</p> Signup and view all the answers

Flashcards

PRIM Computer Function

Primary computers (FCPC) control flight, speed brakes, spoilers, protection speeds, and rudder limits.

SEC Computer Function

Secondary computers (FCSC) control direct flight and yaw damping functions, also rudder trim and limits.

Master Computer

The designated PRIM computer (initially P1) that sends instructions to other computers for execution.

Backup Computer System

If the master computer fails, other PRIM computers (P2 or P3) or SEC computers take over the control.

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Single SEC Control

A single secondary computer (SEC) can totally control the aircraft if all primary computers fail.

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Green Hydraulic System Failure

When the green hydraulic system fails, the aircraft's control system is compromised, requiring a backup computer system to take over.

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P2 as Master Computer

If the green hydraulic system fails, P2 (the second primary computer) takes over as the master computer, replacing P1.

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Primary Computer (PRIM)

The primary computers (PRIM) control critical flight functions like speed, spoilers, and rudder limits.

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Secondary Computer (SEC)

Secondary computers (SEC) provide backup control for direct flight, yaw damping, rudder trim, and limits.

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FCDCs

Flight Control Data Computers (FCDCs) collect information from PRIM and SEC computers and send it to the EIS (Engine Indication System) and CMC (Central Maintenance Computer).

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PRIM

Primary computers (PRIMs) gather data about the aircraft's systems, like the rudder, brakes, and spoilers.

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SEC

Secondary computers (SECs) provide backup control for critical systems and assist the PRIMs in managing the aircraft.

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RUD TRV LIM Error

A "RUD TRV LIM" error message on the ECAM (Electronic Centralized Aircraft Monitor) might appear if one FCDC detects a ground condition but the other doesn't. This usually disappears once the rudder is pressurized by hydraulics.

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Hydraulic Pressure and Rudder

The rudder system relies on hydraulic pressure to function correctly. This is why the "RUD TRV LIM" error often goes away when the hydraulic pressure is applied.

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BCM Computer's Role

The Backup Control Module (BCM) computer provides yaw damping and direct rudder control using pedals when the primary flight control computers (PRIM and SEC) fail or there's a total electrical failure.

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BCM's Independence

The BCM operates independently of the main flight control computers, with its own power supply, sensors (gyros and pedals), and hydraulic actuators.

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Yaw Alternate Law

When activated due to a failure, the BCM takes control, but turn coordination won't be available, meaning the aircraft might not turn smoothly.

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BCM's Power Source

The BCM uses a Backup Power Supply (BPS), powered by either the B or Y hydraulic system, to function in case of main power failure.

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BCM's Limitations

While the BCM provides essential control, it doesn't offer full turn coordination, which means the aircraft might not turn as smoothly as expected.

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Study Notes

3 PRIM Computers

  • Each Flight Control Primary Computer (FCPC) handles normal, alternate, and direct control laws
  • Responsible for speedbrake and ground spoiler control
  • Computes protection speed
  • Manages rudder travel limit

2 SEC Computers

  • Flight Control Secondary Computers (FCSC) control direct control laws, including yaw damper function
  • Controls rudder trim and rudder travel limit

Computer Operations

  • One computer can manage all aircraft functions, including landing
  • In normal operation, one PRIM computer is designated the master (P1)
  • P1 processes orders and sends them to other computers (P2, P3, S1, S2) for execution
  • If a computer fails, another takes over its tasks (except for spoiler control)
  • If the master computer fails, another becomes the new master (P2 or P3)
  • When the green hydraulic system fails, P2 becomes the new master

Additional Notes

  • If all PRIM computers fail, each SEC becomes its own master
  • A single SEC can control the entire aircraft in direct law

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