Type training · Boeing 777 B2 · ATA 45

Boeing 777 B2: Central Maintenance Computing (ATA 45)Type training questions & answers

CMCF redundancy and switching, FDE correlation, flight legs and phases, data loading, input monitoring and AMI.

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Sample Central Maintenance Computing questions with answers

Three questions from the free preview. Think of your answer first, then open the explanation.

  1. 1.How many 777 central maintenance computing functions (CMCFs) control the outputs at one time?

    • A.One per AIMS processor card
    • B.One; the other is backup
    • C.Both, sharing the load
    Show answer and explanation

    Correct answer: B. One; the other is backup

    There is a CMCF in each AIMS cabinet; only one operates as primary, the other is a backup. Ref Olympic B777 training manual, ATA 45.

  2. 2.With both CMCFs serviceable after power-up, which one is primary?

    • A.The left CMCF
    • B.The right CMCF
    • C.The last one used
    Show answer and explanation

    Correct answer: A. The left CMCF

    The left CMCF is primary. The right becomes primary if the left fails or if you switch it from the MAT. Ref Olympic B777 training manual, ATA 45.

  3. 3.What happens when the BITE of the controlling 777 CMCF detects a failure?

    • A.Both CMCFs restart together
    • B.The MAT goes to SELF LOAD
    • C.The offside CMCF takes over
    Show answer and explanation

    Correct answer: C. The offside CMCF takes over

    BITE records a shop fault and the failed CMCF loses control to the offside CMCF, which becomes primary. Ref Olympic B777 training manual, ATA 45.

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Part of the Boeing 777 B2 type course

One chapter of the Boeing 777 B2 type course question bank, for the 777 avionics, written in our own words for revision. Your type course and the aircraft maintenance manual stay the authority: limits and procedures can differ between airframes and operators.

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