If you disconnect the Static line from both and leave to open air, on the ground
of course, then at least eliminates a common blockage.
Water in the lines?
Or could simple be a need to adjust the zero on the VSI and a faulty encoder on
the transponder.
Alan
Sent from my iPhone
> On 24 Dec 2017, at 04:05, William Bliss <william@wbliss.co.uk> wrote:
>
>
> Hi All
>
> Maybe someone can help with these two problems - are they connected?:
>
> 1. My VSI has started reading 100ft descent/min - even when I am parked on the
ground. When it reads zero in flight I am actually climbing.
>
> 2. My Transponder (old Narco unit) has started indicating about 2000ft higher
than I actually am.
>
> I think both occured at about the same time.
>
> I am about to fit a new Trig transponder and so will check the visible pipes
for condition etc. Does this combination ring any bells?
>
> Happy Christmas and New Year
>
> William Bliss G-WUFF
>
>
>
>
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