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marty_away(at)hotmail.com
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 Posted: Wed Oct 10, 2007 6:21 pm Post subject: static port & altimeter error - ATC concerns |
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The controller compares it against the altitude you were assigned on initial contact.
If your stated altitude differs from what your transponder states that you're at by 300 feet or more, the controller will question you to check altimeter and tell you the difference. If the problem continues, the controller can't use your mode C and will ask you to strangle it. The control facility used to (may still do) update the their local altimeter setting into the automation to adjust for pressure changes.
Marty
RV-7 (fitting interior systems)
Was a controller once, and young
[quote] From: dale1rv6(at)comcast.net
To: rv-list(at)matronics.com
Subject: RE: Re: static port & altimeter error
Date: Wed, 10 Oct 2007 14:57:04 -0400
--> RV-List message posted by: "Dale Walter" <dale1rv6(at)comcast.net>
In the US many or most approach control areas have radar altitude from their
ground system, independent of your on board encoder. Enroute seems to be a
different story.
Dale
Do not archive
--
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Kellym
Joined: 10 Jan 2006
Posts: 1705
Location: Sun Lakes AZ
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| Posted: Wed Oct 10, 2007 7:32 pm Post subject: static port & altimeter error - ATC concerns |
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I know of NO FAA approach control with any kind of vertical altitude
radar. AFB Rapcons generally have GCA/PAR radar for approach guidance,
but that doesn't give a controller MSL altitude. The computer system
requires manual input of local altimeter setting. As stated, controller
must verify your encoder response, and if within 300 ft, it is
considered verified. Larger error, they have to have you turn off mode C.
Marty Helller wrote:
[quote] The controller compares it against the altitude you were assigned on
initial contact.
If your stated altitude differs from what your transponder states that
you're at by 300 feet or more, the controller will question you to
check altimeter and tell you the difference. If the problem
continues, the controller can't use your mode C and will ask you to
strangle it. The control facility used to (may still do) update the
their local altimeter setting into the automation to adjust for
pressure changes.
Marty
RV-7 (fitting interior systems)
Was a controller once, and young
> From: dale1rv6(at)comcast.net
> To: rv-list(at)matronics.com
> Subject: RE: Re: static port & altimeter error
> Date: Wed, 10 Oct 2007 14:57:04 -0400
>
>
>
> In the US many or most approach control areas have radar altitude
from their
> ground system, independent of your on board encoder. Enroute seems
to be a
> different story.
>
> Dale
>
> Do not archive
>
> --
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http://www.matronics.com/Navigator?RV-List |
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_________________
Kelly McMullen
A&P/IA, EAA Tech Counselor # 5286
KCHD |
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