Wild Vario Needle Swings

On Sunday, March 3, 2013 10:18:02 PM UTC-6, wrote:
Any suggestions as to cause and fix? Bill

Sounds like you have a leak in the TE line and they were both actually sensing static pressure. If hooked up backwards, they will operate backwards. If you had a leak between the capacity and the vario and a good connection between the vario and the TE probe, the vario would go full up and stay there until you land.

Could be a missed connection in the plane, or maybe your probe didn't seal up in the fitting in the vertical tail

Steve Leonard

Agee with Steve, sounds like a T/E leak, could be anywhere from the back of
one of the instruments (or even inside one) to the probe connection on the
fin. You can check if you can get hold of some instrument tubing, a T
piece, a syringe and an old ASI. Connect pilot connection on ASI to one
branch of the T, syringe to another and 3rd to T/E port in fin. Slowwly
push in plunger on syringe, varios should read down. Stop pushing and
varios will com back to zero if no leak and will read up if there's a leak.
Up reading proprtional to size of leak.

At 05:40 04 March 2013, Steve Leonard wrote:
On Sunday, March 3, 2013 10:18:02 PM UTC-6, wrote:
Any suggestions as to cause and fix? Bill

Sounds like you have a leak in the TE line and they were both actually
sens=
ing static pressure. If hooked up backwards, they will operate
backwards.
=
If you had a leak between the capacity and the vario and a good
connection=
between the vario and the TE probe, the vario would go full up and stay
th=
ere until you land.

Could be a missed connection in the plane, or maybe your probe didn't
seal
=
up in the fitting in the vertical tail

Steve Leonard