Announcement

Collapse
No announcement yet.

Altimeter not reading correctly

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

  • Altimeter not reading correctly

    I went flying in my 2008 Eurostar and all was fine. The following week (2nd march) I turned up at the airfield and could not reset the Altimeter to either read QFE or QNH. when I reset to the correct millibar for the airfield it was indicating the wrong height. e.g. 1019.0 should have read 398 feet QNH but was showing something like 700 feet

    I tried twiddling the knob today again and still I cannot set it to QFE or QNH.

    Any ideas on how to reset and or how to test?

    I did take the eurostar up with two gps ( so had two height readings) apart from the the altimeter not reading the correct height, the altimeter did move up and down in synch with the two gps

    In desparation

    Wayne

  • #2
    Altimeter not reading correctly

    It depends on the altimeter. I can't remember the details but there should be a small scew near the pressure-setting adjustment knob. If you loosen this off you should be able to pull out the knob slightly and change the pressure setting without changing the displayed altitude (or vice versa, I said I couldn't recall the detail). You then push the knob back in and tighten the screw (boys, calm down!).

    Two potential problems that I'm aware of:
    1) it's a Chinese copy atimeter and the screw is just for show
    2) your altimeter has developed a slow leak in its bellows and you'll never get a stable reading (IIRC it actually becomes temperature sensitive).

    In either of those cases you are after a new altimeter, or ignore the pressure readings and just do your adjustments based on the displayed altitude and known airfield height.

    Joan
    PS. This thread may help

    http://forums.bmaa.org/default.aspx?...g=67687#m67687

    Edit: PS added

    Comment


    • #3
      Altimeter not reading correctly

      Joan

      Many thanks, I will give it s go when i am back at the filed this weekend.

      regards

      wayne

      Comment


      • #4
        Altimeter not reading correctly

        Adjusted mine with that method some years ago Wayne....been fine since.

        Nick.
        "When once you have tasted flight...you will forever walk with your eyes turned skywards..."

        https://www.youtube.com/user/nickjaxe/videos.

        Comment


        • #5
          Altimeter not reading correctly

          Result. Thanks for the info. It looks like screw 2 was not locked in place so when I adjusted the knob it changed the settings. All is now locked in place.

          Many thanks for the advice.

          Regards

          Wayne

          Comment

          Working...
          X