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    On A/c 001-002, 101-150

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    aalkamis

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    On A/c 001-002, 101-150

    Uploaded by

    aalkamis
    7 views3 pages

    Original Title

    APU

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    Copyright:

    © All Rights Reserved
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    7 views3 pages

    On A/c 001-002, 101-150

    Uploaded by

    aalkamis

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    of 3

    Customer : IYE Manual : AMM

    Type : A318/A319/A320/A321 Selected applicability : ALL


    Rev. Date : Nov 01, 2022

    ** ON A/C 001-002, 101-150


    7. Operation/Control and Indicating
    (Ref. Fig. Starting System - Block Diagram SHEET 1)

    Print Date: February 27, 2024 Page 1 of 3


    © AIRBUS S.A.S. ALL RIGHTS RESERVED. CONFIDENTIAL AND PROPRIETARY DOCUMENT.
    Customer : IYE Manual : AMM
    Type : A318/A319/A320/A321 Selected applicability : ALL
    Rev. Date : Nov 01, 2022

    AVAIL
    ON
    2KD
    START COMMAND IN

    301PP 2KA
    28VDC COCKPIT
    START SWITCH

    START CONTACTOR IN
    BATTERY
    6KA

    START CONTACTOR OUT


    3PP
    28VDC 10KA 5KA
    BACK-UP START
    START CONTACTOR
    CONTACTOR

    BCL1 1PB1

    BCL2 1PB2

    BACK-UP START
    CONTACTOR OUT

    MOTOR CTL

    59KD ECB

    IGN
    UNIT
    P10
    M
    8KA
    STARTER MOTOR

    APU

    N_MM_494200_0_LEM0_01_00

    Figure 49-42-00-18500-12-A / SHEET 1/1 - Starting System - Block Diagram


    ** ON A/C 001-002, 101-150

    Print Date: February 27, 2024 Page 2 of 3


    © AIRBUS S.A.S. ALL RIGHTS RESERVED. CONFIDENTIAL AND PROPRIETARY DOCUMENT.
    Customer : IYE Manual : AMM
    Type : A318/A319/A320/A321 Selected applicability : ALL
    Rev. Date : Nov 01, 2022

    When you put the MASTER SW pushbutton switch in the ON position:


    · the main relay 4KD is energized,
    · the ECB starts the prestart test,
    · the APU fuel pump system is energized,
    · the APU air inlet door opens.
    When you put the START pushbutton switch in the ON position:
    · the ON legend in the START pushbutton switch comes on,
    · The ECB energizes the back-up start contactor 10KA and (1.5 seconds later) the start contactor 5KA, The
    contactors energize the starter motor 8KA with 28 V DC when these conditions are met:
    .the air intake is open,
    .the Power-Up Test (PUT) is complete,
    .the oil level test is complete.
    · the contactors energize the starter motor 8KA with 28 V DC and the APU starter motor starts to turn. The
    starter clutch engages and turns the APU main shaft,
    · the ECB energizes the igniters,
    · the ECB energizes the de-oil solenoid valve to the open position,
    · the APU operation data is shown on the lower ECAM display unit.

    NOTE: During Ram Air Turbine (RAT) extension, APU starting is inhibited by the Battery Charge Limiters (BCL
    1 and BCL 2), which prevent operation of the main start contactor 5 KA.

    At 3% speed, the ECB energizes the fuel solenoid valve to the open position.

    At 5% speed, the ECB controls the fuel flow to the APU.

    At 55% speed, the ECB:


    · de-energizes the start contactor 5KA which switches off the starter motor 8KA and the ECB accelerates the
    APU automatically,
    · de-energizes the back-up start contactor 10KA, after 5 seconds,
    · de-energizes the de-oil solenoid valve to the closed position.
    At 95% speed:
    · the ECB controls and monitors the APU automatically,
    · the green AVAIL legend in the START pushbutton switch comes on,
    · the blue ON legend in the START pushbutton switch goes off.
    · the APU bleed valve is ready for operation,
    · the APU generator is ready for operation.

    End of document

    Print Date: February 27, 2024 Page 3 of 3


    © AIRBUS S.A.S. ALL RIGHTS RESERVED. CONFIDENTIAL AND PROPRIETARY DOCUMENT.

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