Type training · Boeing 737 Classic B1.1 · ATA 70–73

Boeing 737 Classic B1.1: CFM56-3 Engine, Fuel and Control (ATA 70–73)Type training questions & answers

Engine modules, MEC and PMC, fuel distribution, sensors, VSV and VBV, and clearance control.

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Sample CFM56-3 Engine, Fuel and Control questions with answers

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

  1. 1.What type of engine is the 737 Classic CFM56-3?

    • A.Low bypass, three spool turbofan
    • B.High bypass, geared turbofan
    • C.High bypass, twin spool turbofan
    Show answer and explanation

    Correct answer: C. High bypass, twin spool turbofan

    The CFM56-3 is a high bypass, dual-rotor, axial flow turbofan. Ref 737-300/400/500 AMM 72-00-00.

  2. 2.How many HP compressor stages does the CFM56-3 have?

    • A.Nine, driven by one HPT stage
    • B.Seven, driven by two HPT stages
    • C.Fourteen, driven by one HPT stage
    Show answer and explanation

    Correct answer: A. Nine, driven by one HPT stage

    A single-stage HPT drives the 9-stage HPC. Ref 737-300/400/500 AMM 72-00-00.

  3. 3.How many stages does the CFM56-3 low pressure turbine have?

    • A.Two, with a gearbox
    • B.Six, in two sections
    • C.Four
    Show answer and explanation

    Correct answer: C. Four

    The 4-stage LPT drives the fan and 3-stage booster through the LPT shaft. Ref 737-300/400/500 AMM 72-54-00.

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Part of the Boeing 737 Classic B1.1 type course

One chapter of the Boeing 737 Classic B1.1 type course question bank, for the 737-300/400/500 with CFM56-3 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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