Type training · Boeing 777 B1.1 · ATA 24

Boeing 777 B1.1: Electrical Power (ATA 24)Type training questions & answers

IDGs, backup generators, ELMS load shedding, batteries, external power 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 are the primary electrical power sources of the 777?

    • A.The IDGs only
    • B.The IDGs and the APU generator
    • C.IDGs, APU generator and ground power
    Show answer and explanation

    Correct answer: A. The IDGs only

    The IDGs are the primary sources; the APU generator and external power are used when the IDGs are not available. Ref AMM 24-10-00.

  2. 2.When can an IDG NOT be reconnected in line maintenance after a disconnect?

    • A.After an accidental crew disconnect
    • B.After a high oil temperature trip
    • C.After a manual low oil pressure disconnect
    Show answer and explanation

    Correct answer: B. After a high oil temperature trip

    An automatic disconnect for high IDG oil temperature cannot be reset on the line. Ref AMM 24-10-00.

  3. 3.How long after engine shutdown is the IDG oil level indication accurate?

    • A.At least 5 minutes
    • B.At least 10 minutes
    • C.At least 30 minutes
    Show answer and explanation

    Correct answer: A. At least 5 minutes

    Wait at least 5 minutes after shutdown before reading the level on the maintenance page or sight glass. Ref AMM 24-10-00.

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Part of the Boeing 777 B1.1 type course

One chapter of the Boeing 777 B1.1 type course question bank, for the 777-200/-200ER with GE90, PW4084 or Trent 800 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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