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  1. #1

    Power asymmetry triggered Cork Metro's fatal roll

    Full article here

    Partial quote

    Significant torque split between the throttle levers of a Fairchild Metro contributed to the pilots’ losing control of the aircraft during a low-visibility approach to Cork, a fatal accident inquiry has disclosed.

    Although the first officer was the flying pilot, the captain took control of the throttle levers on the final approach to runway 17 – the crew’s third landing attempt.

    He then retarded the levers below flight-idle, against normal procedures, and the Irish Air Accident Investigation Unit believes this would have been “unexpected” by the first officer.

    Such was the power asymmetry that the left-hand engine entered a negative torque regime, normally only used during ground manoeuvring, and the propeller’s automatic feathering mechanism began to activate.

    The aircraft suddenly rolled 40 to the left and the crew began to execute a go-around at about 100ft.

    As the throttle levers were advanced, the aircraft rolled quickly to the right. The investigation could not determine whether the first officer had turned the control wheel, to counter the initial left roll, but states that the rapid increase in power probably contributed to the subsequent roll to the right.

    The Metro’s right wing-tip struck the runway and the aircraft inverted, coming to rest off the right side of the runway.
    What is your take on the situation? Have you ever faced a challenge while flying which could have also had deadly results?

    My thoughts are with the relatives.
    Hagar likes boats. I like airplanes!

  2. #2
    It's great to have you present it.
    Last edited by Carl; April 24th, 2016 at 06:14.

  3. #3
    I wish we could have more discussion on this.

    We get some fairly good multiengine training when we're first working on our ratings but I think the art and science of flying on one engine in a twin is lost after that. Sure, we do V1 cuts but I think we forget what the red line on the airspeed indicator means and what will happen if we go slower than that on one engine.
    Hagar likes boats. I like airplanes!

  4. #4
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    Helga,

    I think you're right.

    Doing V1 Cuts in large aircraft is not the same as engine out procedures in light twins.

    The large aircraft are required to have enough thrust to climb on one engine and meet the required climb gradient.

    Light twins are only required to maintain altitude on one engine, and then only if the pilot gets everything right.

    In a large Part 25 airplane, we are required to continue the takeoff in the engine failure occurs at or above V1. A pilot would be a fool to continue the takeoff in a light twin...
    Thor Odinson... you have betrayed the express command of your king. Through your arrogance and stupidity, you've opened these peaceful realms and innocent lives to the horror and desolation of war! You are unworthy of these realms, you're unworthy of your title, you're unworthy... of the loved ones you have betrayed! I now take from you your power! In the name of my father and his father before, I, Odin Allfather, cast you out!

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