REFLECTOR: Static port calibration

[nmflyer1 at aol.com]

Larry & all, 

Kent made mention of this, but probably not stern enough. If you are questioned about your altitude while IFR, and you know that you have "drifted" , make sure you report level at the altitude that you were supposed to be at!!! Then, get back there within 20 seconds (less than 2 updates of center radar). Some might even want to switch the transponder to Standby for about a half minute, then back to ALT. Now I can not condone this action, but it will definately work. Many things can cause what we call "Bad Hits" on the radar/mode C.  As Kent said before, a pilot's report of an altitude over rides a bad hit. Now if you call level, then it shows off for another minute, all bets are off. 

Fly safe, and be Vewy Vewy quiet :) 

Kurt.  And yes... Big Brother will deny this :0 


-----Original Message-----
From: lawrence epstein <ljepstein at hotmail.com>
To: Reflector Reflector <reflector at tvbf.org>
Sent: Wed, 4 Mar 2009 7:35 pm
Subject: Re: REFLECTOR: Static port calibration


Glad to know that Kurt. I was always afraid that if I was 100 ft off I would get a nasty call to the tower when I landed!

Larry E.

To: reflector at tvbf.org
Date: Wed, 4 Mar 2009 17:34:56 -0500
From: nmflyer1 at aol.com
Subject: Re: REFLECTOR: Static port calibration


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 the20actual 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 Message-----
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 see
ing 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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