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BAe 146 - ALF 502-R5 - T/O Thrust (Ref & Flex) Charts

Scheduled Pinned Locked Moved 146 Professional
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  • P Offline
    P Offline
    plhought
    wrote on last edited by
    #1

    Hey all!

    Did some digging in the old files and pulled these out! Hopefully some use for the developers and/or fellow simmers out there!

    Cheers,

    Patrick

    ALF502 TambFlex.jpg

    FlexTO.jpg

    N1Ref.jpg

    b3lt3rB 1 Reply Last reply
    4
  • b3lt3rB Offline
    b3lt3rB Offline
    b3lt3r
    replied to plhought on last edited by
    #2

    @plhought Got all excited and impressed, then read it 7 or 8 times and got a headache :-)

    My brain gets worse by the day - I would love to see some worked examples.

    Oh and got confused about the engine anti-ice.... On the very top chart it appears to say engine a/ice off in the middle heading and on the right it's on - hence the headache :-)

    Regardless - appreciate the digging and sharing!

    T 1 Reply Last reply
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  • T Offline
    T Offline
    Toozin
    replied to b3lt3r on last edited by
    #3

    @b3lt3r What is missing, and all important, is the weight that can be lifted at each temperature and associated TOD.

    P 1 Reply Last reply
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  • P Offline
    P Offline
    plhought
    replied to Toozin on last edited by plhought
    #4

    On the 146 the weight is kinda seperate from the Flex calculation.

    What does change is your take off distance and V1 as you'll likely be taking longer to roll/climb etc etc. Until someone makes a publically available take off calculator just gonna have to use the brain a bit.

    There is no chart or limitation for payload vs. a flex power setting.

    In practice - at the operator I'm familiar with - taking off with a light load or a very long runway in the winter, is the only time flex power was used in the 146. Most of the time come spring/summer the engine was already limited to a reduced N1 as you see in the above charts. So any kind of wear and tear benefit was miniscule.

    On the Avro the TMP makes things little easier, and the better performance calculating and engine condition monitoring tools (Engine Life Computer) make the REDU thrust takeoffs used a lot more.

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