Type training · Boeing 737 Classic B1.1 · ATA 74–80

Boeing 737 Classic B1.1: CFM56-3 Ignition, Controls, Reverser, Oil and Start (ATA 74–80)Type training questions & answers

Ignition, HPT clearance control, engine controls and fire handle, indicating, thrust reverser, oil and air starter.

Start practising →43 questions · free preview available

Sample CFM56-3 Ignition, Controls, Reverser, Oil and Start questions with answers

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

  1. 1.How many ignition exciters does each 737 Classic CFM56-3 have?

    • A.Two, independent
    • B.One, with two outputs
    • C.Four, two per igniter
    Show answer and explanation

    Correct answer: A. Two, independent

    Two independent exciters on the fan case at 2 o'clock; alternate use of the circuits is recommended. Ref 737-300/400/500 AMM 74-11-00.

  2. 2.What is the CFM56-3 high energy exciter output?

    • A.25 to 30 kV at 1 spark every second
    • B.15 to 20 kV, 2 sparks/s
    • C.5 to 8 kV at 10 sparks every second
    Show answer and explanation

    Correct answer: B. 15 to 20 kV, 2 sparks/s

    High energy: 15 to 20 kV at 2 sparks per second; low energy: 14 to 18 kV at 1 spark per second, 1.2 J each. Ref 737-300/400/500 AMM 74-11-00.

  3. 3.What input power do the CFM56-3 ignition exciters use?

    • A.115 V ac, 400 Hz
    • B.28 V dc battery
    • C.N2 alternator only
    Show answer and explanation

    Correct answer: A. 115 V ac, 400 Hz

    The exciters run on 105 to 122 V ac at 380 to 420 Hz. Ref 737-300/400/500 AMM 74-11-00.

Practise all 43 CFM56-3 Ignition, Controls, Reverser, Oil and Start questions →

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.

All Boeing 737 Classic B1.1 chapters →

More Boeing 737 Classic B1.1 chapters

Start practising →All Boeing 737 Classic B1.1 chapters