Re: Pitot system testing


Subject:    Re: Pitot system testing
From:    Kelly McMullen (kellym@aviating.com)
Date:    Fri Nov 20 - 12:31 PM
If you are going to fly where a transponder and encoder are required, a 
static system check is required. If you care about protecting your 
airspeed instrumentation, the pitot system must be connected and 
maintained at the same pressure as the static system, otherwise you will 
overspeed the airspeed indicator once the static system is raised to 
altitude. As you say, it isn't regulatory, it is good safe practice for 
the instruments. A side benefit is that the airspeed can be verified at 
the same time.
Some of us have the joy of operating under a mode C veil for our home 
base, making encoder and certification mandatory before first flight.

William Curtis wrote:
> FYI.  There is no regulatory pitot check and so no such thing as a 
> pitot/static check.  Only the static system and your transponder 
> reporting system is checked.  Don't assume that your pitot system is 
> checked as part of a standard 91.411 or 91.413 certification. 
> 
> On Thu, Nov 19, 2009 at 9:08 PM, Rick Sked <ricksked@embarqmail.com 
> <mailto:ricksked@embarqmail.com>> wrote:
> 
>     <mailto:ricksked@embarqmail.com>>
> 
>     You may want to check the tray if you have a TruTrak AP installed, I
>     had an issue with the tray when testing the panel alone. I have a
>     similar drop in pressure right now but the system matches right up
>     with the GPS speed & altitude so It doesn't appear to be an issue. I
>     plan on having the pitot/static check completed soon which may or
>     may not tell me I have a problem. The ballon test works pretty well
>     for now. Maybe an instrument guru can tell us if there is some
>     allowed blowby in the instruments themselves. All of my connections
>     are confirmed not to leak so it's going somewhere. The only place I
>     can think is internally on the instrument itself.
> 
>     Rick Sked
>     N246RS
> 
> -- 
> William
> N40237 - http://wcurtis.nerv10.com/
> 
> *
> 
> 
> *




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