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System A Hyd depleted after every flight

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    System A Hyd depleted after every flight

    System A hydraulic keeps depleting after every flight. It keeps going to 90 % whether is a short or long flight. Failures are off but it keeps happening. I am on P3D v4.5 HF2, other than that excellent product. I love the taxi physics with the tiller. Easier to taxi now.


    Kevin Tobias
    Kevin Tobias

    #2
    Originally posted by [email protected] View Post
    System A hydraulic keeps depleting after every flight. It keeps going to 90 % whether is a short or long flight. Failures are off but it keeps happening. I am on P3D v4.5 HF2, other than that excellent product. I love the taxi physics with the tiller. Easier to taxi now.


    Kevin Tobias
    I hesitate to call 90% depleted. The RF (required fill) annunciation doesn't come on until 76%. Also, when engines are running and hydraulics are in use the levels should be lower.
    Last edited by DDowns; 29Jul2020, 20:48.
    Dan Downs KCRP
    i7-10700K 32GB 3600MHz 1080Ti

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      #3
      Originally posted by [email protected] View Post
      System A hydraulic keeps depleting after every flight. It keeps going to 90 % whether is a short or long flight. Failures are off but it keeps happening. I am on P3D v4.5 HF2, other than that excellent product. I love the taxi physics with the tiller. Easier to taxi now.


      Kevin Tobias
      That's normal behavior. All that fluid goes to the lines and actuators as soon as you pressurize hydraulics and use hydraulic systems. In flight I have never seen SYS A showing 90%.
      Omar Josef
      Spain

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        #4
        According to operating policy minimum dispatch is 92%. That is why when you service the hydraulics through the cdu they go to 92%.. According Boeing maintenance manual.
        Although with hydraulics pressurized it doesn't go to 90%. It only goes that low when flaps are used or flight control usage. They don't deplete to 90% after every flight. My company flies from USA to the Caribbean regularly and the hydraulics doesn't reach to 90%. Lowest is 96%. That's not normal behavior in my book.
        Last edited by [email protected]; 30Jul2020, 18:03.
        Kevin Tobias

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        • DDowns
          DDowns commented
          Editing a comment
          Not unusual to see two line pilots disagreeing on something, especially different companies.

        #5
        In my manual, minimum for dispatch is "no RF indication" (So 76%).
        This photo is from yesterday during cruise. On the ground, quantity was well over 90%. Note that the RF indication is inhibited in-flight. It only shows on the ground with both engines shutdown or after landing with flaps up during taxi-in.

        hyd.jpg
        Last edited by Aeromar; 03Aug2020, 09:23.
        Omar Josef
        Spain

        Comment


        • AngelofAttack
          AngelofAttack commented
          Editing a comment
          Most of that oil was in the landing gear mechanism after their retraction.

        • DDowns
          DDowns commented
          Editing a comment
          He said is was during cruise.

        • Aeromar
          Aeromar commented
          Editing a comment
          Yeah, the landing gear is the main reason why in the cruise SYS A quantity is so low. It's normal behavior. Nothing to worry about.

        #6
        Not sure if it's new to 2.91.0496 or cargo, but there is what I see on 738BCF, after gear retraction, sysA get MORE oil, I tried cycle the gear few time and it persists.
        BTW when I tried to cycle the gear, I can't get the lever to UP from OFF position, I can only move it to UP when it's in DOWN position. TIM图片20200816202413.png
        ZHU Hai
        B737 Ground instructor

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