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Altimeter Drum

Scheduled Pinned Locked Moved 146 Professional
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  • A Offline
    A Offline
    Avionic
    wrote last edited by
    #1

    One bug remaining in the 146, that hasn't been fixed with the 2024 update is how the drum counters move in the altimeter. Drum movements aren't connecting in the way they should be. Another user has explained the problem with movement very well for the X-plane sister-plane, so i will link it here https://community.justflight.com/post/36505
    Not sure how closely connected the teams are, so wanted to report that the issue still exists on latest MSFS patch.
    Pic to from 2.4b today at FL290.
    ebdeb6d4-f119-47d6-996b-c4a33c85d9d0-Skærmbillede 2025-12-11 205403.png

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    • MarkM Offline
      MarkM Offline
      Mark
      JF Staff
      wrote last edited by
      #2

      The screenshot you posted shows the aircraft just below 29,000 ft, and the drums on the Altimeter are in the process of rolling over from 28,980 ft to 29,000 ft. That's similar to how the altimeter in the real aircraft behaves, as the drums won't indicate exactly 29,000 ft unless the aircraft is exactly level at 29,000 ft.

      Mark - Just Flight

      Just Flight Development Assistant

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      • MarkM Mark

        The screenshot you posted shows the aircraft just below 29,000 ft, and the drums on the Altimeter are in the process of rolling over from 28,980 ft to 29,000 ft. That's similar to how the altimeter in the real aircraft behaves, as the drums won't indicate exactly 29,000 ft unless the aircraft is exactly level at 29,000 ft.

        Mark - Just Flight

        A Offline
        A Offline
        Avionic
        wrote last edited by
        #3

        @Mark The linked thread explains how the movement of the real altimeter works quite well with plenty of pics, so I thought it wouldn't be necessary to explain it here.
        As the other poster documented in details, IRL the rollers grab the next one left and they roll over in sync with them. So for obvious reasons you are never supposed to be able to have a situation like on the standby altimeter, where the tens and hundreds are at 0 and the thousands is a number lower. You either have X 8 9 80 or X 9 0 00 (or all of them halfway in a turn) - never the thousands rotating on its own out of sync with the next numbers.

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