Ralf,

 

If you have at least a Mode C transponder and fly where one is needed, you need to get the altimeter/transponder static system checked every two years.  That's for your own safety and every one else you might run into, even in VFR conditions. 

 

The static system check assumes no error in picking up ambient pressure.  That's easy when you're not moving, but one of the ways to verify it in flight is to have a pitot with no error from its placement, GPS and an air-data computer hooked in that displays true airspeed - fly 3 (120D) or 4 legs (90D) in the same air mass at the same airspeed and altitude (probably need an autopilot for that) - then check that the average of the ground speeds equals the TAS (should have been a constant for all legs).  If so, static and pitot are fine.  If not, one or both pressure sources may have errors.

 

Another way is to buzz the tower (at a known actual MSL, sensitive altimeter with baro properly set) and the indicated altitude matches.  If not, you got one known error discovered.

 

It's experimental but someone has to check this stuff..............

 

Grayhawk

 

 

Dear subscribers,

 

In order to fly IFR I know that you need to get your altimeter checked every two years.

 

The question that I have is for the rest of the static system. Is this covered under the annual inspection or do you have to get the whole static system checked in the airplane from a certified avionic shop?

 

So far I always checked my system by blowing/sucking the pitot and sealing it with my tounge with a friend watching the instruments for any change.

 

Thanks for your input

 

Ralf