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    Rolls-Royce: Commercial Engine Bulletin

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    turboshaft
    This bulletin requires operators to avoid steady-state engine N2 operation within specified speed avoidance ranges for certain turbine wheel part numbers. Transient operation through the ranges is permitted so long as it does not dwell for over one second. The technical aspects of the bulletin have been approved by the FAA, and compliance is required immediately without affecting interchangeability, tooling, weight and balance, or electrical load data.

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    Rolls-Royce: Commercial Engine Bulletin

    Uploaded by

    turboshaft
    59 views1 page
    This bulletin requires operators to avoid steady-state engine N2 operation within specified speed avoidance ranges for certain turbine wheel part numbers. Transient operation through the ranges is permitted so long as it does not dwell for over one second. The technical aspects of the bulletin have been approved by the FAA, and compliance is required immediately without affecting interchangeability, tooling, weight and balance, or electrical load data.

    Original Description:

    Export Controlled

    Original Title

    TP CEBA-1343 - 7

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    This bulletin requires operators to avoid steady-state engine N2 operation within specified speed avoidance ranges for certain turbine wheel part numbers. Transient operation through the ranges is permitted so long as it does not dwell for over one second. The technical aspects of the bulletin have been approved by the FAA, and compliance is required immediately without affecting interchangeability, tooling, weight and balance, or electrical load data.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    59 views1 page

    Rolls-Royce: Commercial Engine Bulletin

    Uploaded by

    turboshaft
    This bulletin requires operators to avoid steady-state engine N2 operation within specified speed avoidance ranges for certain turbine wheel part numbers. Transient operation through the ranges is permitted so long as it does not dwell for over one second. The technical aspects of the bulletin have been approved by the FAA, and compliance is required immediately without affecting interchangeability, tooling, weight and balance, or electrical load data.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    of 1

    ALERT

    EXPORT CONTROLLED Rolls-Royce


    COMMERCIAL ENGINE BULLETIN
    C. Description
    This CEB requires Operators to avoid engine N2 steady--state operation in the speed avoidance
    range as specified by 3rd--stage turbine wheel part number and 4th--stage turbine wheel part
    number in the following wording and charts. Transition through the speed range is to be
    accomplished as expediently as possible. In autorotation, with N2 split from NR and throttle in
    the Ground Idle position, unrestricted operation within the speed avoidance range is permitted.
    Transient operation in the speed avoidance range during recovery from autorotation is
    permitted.
    NOTE: Transient Operation is defined as no dwell at an N2 speed of more than a 1 second
    duration.

    D. Approval
    Technical aspects are FAA approved.

    E. Compliance
    Compliance Code 1: To be complied with immediately.

    F. Interchangeability -- Not affected

    G. Material Availability

    PART NUMBER QTY/ENGINE NAME MODEL


    23065833 1 Third--stage, Turbine Wheel C20 Series,
    C20R Series
    23065818 1 Third--stage, Turbine Wheel B17 Series,
    B17F Series,
    C20 Series,
    C20R Series,
    C20S
    23055944 1 Fourth--stage, Turbine Wheel B17 Series,
    B17F Series,
    C20 Series,
    C20R Series,
    C20S
    M250--10445 1 Fourth--stage, Turbine Wheel B17 Series,
    B17F Series,
    C20 Series,
    C20R Series,
    C20S

    H. Tooling -- Not affected

    I. Weight and Balance -- Not affected

    J. Electrical Load Data -- Not affected

    December 22, 2006 M250--C20 Series CEB A--1400


    Revision 6 M250--C20R Series CEB A--72--4095
    April 12, 2018 M250--B17 Series TP CEB A--1343
    M250--B17F Series TP CEB A--72--2091

    E2006, 2018 Rolls--Royce Corporation Page 2 of 7

    Rolls-Royce Proprietary Data – Uncontrolled Printed Copy

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