Type training · Boeing 767 B1.1 · ATA 75

Boeing 767 B1.1: CF6-80C2 Engine Air Systems (ATA 75)Type training questions & answers

Core compartment cooling, HPT clearance control, T3 sensor, variable stator vanes and variable bypass valves.

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Sample CF6-80C2 Engine Air Systems questions with answers

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

  1. 1.Which units control the CF6-80C2 engine air systems?

    • A.The pneumatic controller
    • B.The EEC and the HMU
    • C.The EICAS computers
    Show answer and explanation

    Correct answer: B. The EEC and the HMU

    The EEC commands and the HMU supplies servo fuel to the actuators and valves.

  2. 2.Which two systems use fan air to cool the CF6-80C2?

    • A.The VBV and VSV systems
    • B.Bore cooling and the HPC bleed
    • C.Core and turbine case cooling
    Show answer and explanation

    Correct answer: C. Core and turbine case cooling

    Fan air goes to the core compartment cooling system and the turbine case (active clearance control) cooling system.

  3. 3.Which two systems regulate air entering the HPC?

    • A.CCCV and HPTC valve
    • B.Bore cooling and bleed valves
    • C.Variable bypass valves and VSVs
    Show answer and explanation

    Correct answer: C. Variable bypass valves and VSVs

    The VBVs and VSVs control compressor airflow to prevent stall and improve efficiency.

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Part of the Boeing 767 B1.1 engine and APU course

One chapter of the Boeing 767 B1.1 engine and APU course question bank, for the 767-300 with GE CF6-80C2 engines, 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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