Type training · Boeing 737 Classic B1.1 · ATA 29

Boeing 737 Classic B1.1: Hydraulic Power (ATA 29)Type training questions & answers

Systems A, B and standby, pumps and reservoirs, filters, PTU, servicing and indications.

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Sample Hydraulic Power questions with answers

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

  1. 1.How many hydraulic systems does the 737 Classic have?

    • A.Two: left and right only
    • B.Four: A, B, C and standby
    • C.Three: A, B and standby
    Show answer and explanation

    Correct answer: C. Three: A, B and standby

    Three separate 3,000 psi systems: A, B and the standby system, which gives reserve power for critical systems. Ref 737-300/400/500 AMM 29-00-00.

  2. 2.What are the pressure sources of 737 Classic hydraulic system A?

    • A.One EMDP and the RAT pump
    • B.One EDP and one EMDP
    • C.Two EDPs, one per engine
    Show answer and explanation

    Correct answer: B. One EDP and one EMDP

    Systems A and B each have one engine-driven pump and one electric motor-driven pump in parallel. Ref 737-300/400/500 AMM 29-11-00.

  3. 3.What flow does a 737 Classic engine-driven hydraulic pump give?

    • A.About 22 gpm at 3,000 psi
    • B.About 6 gpm at 2,700 psi, like the EMDP
    • C.About 3 gpm at 3,000 psi, like standby
    Show answer and explanation

    Correct answer: A. About 22 gpm at 3,000 psi

    The variable displacement EDP gives about 22 gpm at 3,000 psi; the EMDP gives 6 gpm at 2,700 psi and the standby pump 3 gpm. Ref 737-300/400/500 AMM 29-11-00.

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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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