REFLECTOR: Static port calibration

Wed Mar 4 16:34:56 CST 2009

One last thing:  In the Center environment, if you are flying IFR, the center computer will always show you level when you are within 200' either side of your assigned altitude. If you are flying VFR, it shows the actual altitude as specified before. If you are IFR and want to double check your altitude, you have to ask. Then we type in a different altitude to see what your transponder is really sending out (again, adjusted as preciously mentioned). 

Kurt 

-----Original Message-----
From: nmflyer1 at aol.com
To: reflector at tvbf.org
Sent: Wed, 4 Mar 2009 3:28 pm
Subject: Re: REFLECTOR: Static port calibration

All, 

The encoder (if plumbed correctly) takes pressure from your static line. Then it provides that information to the transponder. The transponder sends that altitude to ATC referenced to an altimeter of 29.92.  The equipment in the ATC facility corrects that for local altimeter settings. So, in essence you are always sending pressure altitude. That is why, if you have a KT76D like mine, it shows you the altitude it is sending to ATC, but it may not match what you are flying. 

Out where I work, flying between LVS (las vegas NM and DHT (Dalhart texas) we will often have altitude discrepancies when there is a big difference in those altimeter settings. Bottom line, fly the altimeter setting you are given and ignore what the Transponder says it is sending out. That is what your Pitot Static check is supposed to cover. 

Kurt 

-----Original M
essage-----
From: Al Gietzen <ALVentures at cox.net>
To: 'Velocity Aircraft Owners and Builders list' <reflector at tvbf.org>
Sent: Wed, 4 Mar 2009 11:35 am
Subject: Re: REFLECTOR: Static port calibration

If ATC is seeing the altitude transmitted by your transponder, naturally it will be identical, assuming you are reading from the same instrument that feeds the transponder.  Am I missing something?

John

No, John; I don’t think you are.  I thought about that, but after you hit the send button it’s too late. But then I thought maybe their radar has some independent way of determining your altitude. Kurt??

Al

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