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    Spurious OVERWNG LOCK Inop Sys Displayed On Ecam: Engineering Support

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    Spurious OVERWNG LOCK Inop Sys Displayed On Ecam: Engineering Support

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    jontis jasoliya
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    Spurious OVERWNG LOCK Inop Sys Displayed On Ecam: Engineering Support

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    jontis jasoliya

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    © All Rights Reserved
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    Spurious OVERWNG LOCK Inop Sys displayed on

    ECAM

    ATA: 31-50 FIN: 1WW1-2 Ref: 31.50.00067


    A/C Type: A318 A/C Serie: Topic: In-Service First Issue 22-JUN-
    A319 Issue Date: 2018
    A320
    A321
    Part 350E053022020 Last 12-APR-
    Number: Publication 2019
    Date:
    Supplier: AIRBUS
    OPERATIONS
    SAS
    Linked Articles: Linked
    Documentation:

    Purpose of this Article:

    Engineering Support
    First Issue Date: 22-JUN-2018
    Model: Last Publication Date: 12-APR-2019
    Manufacturer:

    Applicability:

    A320 family aircraft equipped with the FWC H2-F10 standard (P/N 350E053022020)

    References:

    MOD 162159

    Background
    .
    The “OVERWNG LOCK” ECAM Inop Sys has been introduced in the Flight Warning
    Computer (FWC) standard H2-F10 (P/N 350E053022020). This Inop Sys is normally
    displayed when the Flight Lock Actuator (FLA) installed on emergency over wing door is
    detected inoperative. As only A321NEO Airbus Cabin Flex (ACF) aircraft are fitted with
    over wing doors, this Inop Sys indication has been developed for this aircraft model only
    (A321-200NX).

    The “OVERWNG LOCK” Inop Sys display is normally always associated to one of the
    following ECAM alerts:

    - DOOR L (R) FWD OVERWNG FAULT


    - DOOR L (R) AFT OVERWNG FAULT
    - DOOR L (R) OVERWNG FAULT
    - NAV ADR 1 (2) FAULT
    - ENG 1 (2) EIU FAULT

    Airbus has identified that the “OVERWNG LOCK” Inop Sys computation logics in FWC H2-
    F10 can result in the following incorrect displays:

    - the inop sys is displayed on all A320 family aircraft models (not only on A321 ACF)
    and/or
    - the inop sys is orphan (i.e. not associated to any ECAM alert).

    Description
    .
    The “OVERWNG LOCK” Inop Sys should normally be triggered according to the following
    logic:

    - In flight phase 1 or 10, and


    - On A321 ACF aircraft only, and
    - when at least one of the below conditions is satisfied:

    1. One flight lock actuator is detected faulty. In that case, the Inop Sys is associated with one
    “DOOR L(R) (AFT(FWD)) OVERWNG FAULT” alert.

    OR

    2. EIU 1(2) is detected faulty, or ADR 1(2) is detected faulty or OFF. Indeed, the flight lock
    actuators operation is based on EIU and ADR inputs.

    However, with the FWC H2-F10 logic, the “OVERWNG LOCK” Inop Sys can be spuriously
    triggered on all A320 family aircraft models (not only A321 ACF), in case EIU 1(2) is
    detected faulty, or ADR 1(2) is detected faulty or OFF, in flight phase 1 or 10.

    In addition, the inop sys is orphan (displayed without any associated ECAM alert) when
    displayed due to the “ADR 1 or ADR 2 detected faulty or OFF” condition in flight phase 1
    or 10, or due to the “EIU 1 or EIU 2 detected faulty” condition in flight phase 10. Indeed,
    the corresponding alerts (NAV ADR 1(2) FAULT and respectively ENG 1(2) EIU FAULT)
    are inhibited in flight phases 1 and 10 (respectively flight phase 10 only) as per FWC
    design.

    Recommendation

    On non-ACF aircraft (aircraft models others than A321-200NX), this “OVERWNG LOCK”
    Inop Sys is never relevant and can be disregarded.

    On A321 ACF aircraft (model A321-200NX), the “OVERWNG LOCK” Inop Sys can be
    disregarded only when it is orphan (not associated to any of the above ECAM alerts).
    Otherwise, the associated ECAM alert(s) should be handled and the applicable MMEL
    item(s) should be applied.

    This spurious activation condition is not latched: as soon as EIUs and ADRs are not
    detected faulty/OFF anymore, the INOP “OVERWNG LOCK” disappears.

    Solution

    The OVERWNG LOCK Inop Sys display logic will be reviewed in the FWC standard H2-F12,
    which is expected to be certified by end 2019.

    Additional Note

    N/A

    Survey for the Engineering Support section


    © Airbus SAS, 2019. All rights reserved. Confidential and proprietary document.The technical information
    provided in this article is for convenience and information purposes only. It shall in no case replace the
    official Airbus technical or Flight Operations data which shall remain the sole basis for aircraft
    maintenance and operation. These recommendations and information do not constitute a contractual
    commitment, warranty or guarantee whatsoever. They shall not supersede the Airbus technical nor
    operational documentation; should any deviation appear between this article and the Airbus or airline's
    official manuals, the operator must ensure to cover it with the appropriate document such as TA, FCD,
    RDAS. Access to WISE is supplied by Airbus under the express condition that Airbus hereby disclaims any
    and all liability for the use made by the user of the information contained in WISE. It shall be used for
    the user's own purposes only and shall not be reproduced or disclosed to any third party without the
    prior consent of Airbus.

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