Type training · Boeing 737NG B1.1 · ATA 24

Boeing 737NG B1.1: Electrical Power (ATA 24)Type training questions & answers

IDGs and APU starter-generator, GCU and BPCU protection, bus tie breakers, TRUs, batteries and standby power.

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Sample Electrical Power questions with answers

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

  1. 1.What is the rating of each 737NG integrated drive generator?

    • A.120 kVA
    • B.90 kVA
    • C.75 kVA
    Show answer and explanation

    Correct answer: B. 90 kVA

    IDG 1 and IDG 2 each supply 90 kVA, 115/200 V, 400 Hz. Ref Boeing 737-600/700/800/900 training manual, ATA 24.

  2. 2.What does the 737NG APU starter-generator supply above 32,000 ft?

    • A.Nothing above 32,000 ft
    • B.Falls to 66 kVA at 41,000 ft
    • C.Stays at 90 kVA to 41,000 ft
    Show answer and explanation

    Correct answer: B. Falls to 66 kVA at 41,000 ft

    It gives 90 kVA below 32,000 ft, decreasing linearly to 66 kVA at 41,000 ft. Ref Boeing 737NG training manual, ATA 24.

  3. 3.Can two 737NG ac sources power the same transfer bus at once?

    • A.No, the design prevents it
    • B.Yes, they run paralleled through a tie bus
    • C.Only when the airplane is on the ground
    Show answer and explanation

    Correct answer: A. No, the design prevents it

    The design prevents two sources supplying the same bus at the same time (no paralleling). Ref Boeing 737NG training manual, ATA 24.

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Part of the Boeing 737NG B1.1 airframe and systems course

One chapter of the Boeing 737NG B1.1 airframe and systems course question bank, for the 737-600/700/800/900, 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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