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ALtimeter adjustment
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MichaelGibbs(at)cox.net
Guest

Posted: Wed Aug 23, 2006 12:14 am Post subject: ALtimeter adjustment

kitfoxmike sez:



 	  Quote: 	
		  ...THat's why you always give your altitude when getting clearance 

with atc, so that things can be zero'd so to speak with the 

controller.


	


Air traffic control is looking for your indicated altitude to be 

within 125 feet of the altitude your encoder is transmitting 

(adjusted for local pressure).  If it is not, you may be asked to 

turn off your encoder while receiving radar services because the 

controller cannot rely on the altitude value he sees on his screen.



Mike G.

N728KF

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Michel

Joined: 10 Jan 2006
Posts: 966
Location: Norway

Posted: Wed Aug 23, 2006 1:59 am Post subject: ALtimeter adjustment

 	  Quote: 	
		   From: Noel Loveys [noelloveys(at)yahoo.ca] 

 To swing a compass properly on floats


	


Hum, if I had a seaplane, I think I would adjust the compass by taxiing at say, 10 MPH, on the water, using the GPS set to magnetic heading, as a reference. Of course, it's a two men's job. My experience in both maritime and aviation magnetic compass is that it is impossible to expect more than 5 degrees accuracy, which, IMHO, is good enough.



Cheers,

Michel

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_________________
Kitfox 3 - Jabiru 2200

lcfitt(at)sbcglobal.net
Guest

Posted: Wed Aug 23, 2006 4:19 am Post subject: ALtimeter adjustment

This has been my thought while reading this thread.  It seems that the only 

time I use the compass is to estimate my position from an airport when 

making an initial contact and that is always reported in approximat terms - 

East, Southwest, etc. and when determining runway designations.  I guess I 

have become a "lazy" pilot as we on the West Coast always are in view of 

mountains for general headings. and navigation.  Lots of time when on a 

cross country, we use roads or rivers, but when in a flight of at least two 

will fly direct so have a GPS and "ELT" back-up.



Lowell



---

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Float Flyr

Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland

Posted: Wed Aug 23, 2006 5:54 am Post subject: ALtimeter adjustment

That's why I think some of the requirements  for the compass swing is simply

out to lunch. Having the avionics and other flight equipment turned on may

account for a degree or two and having the engine charging system operating

may account for another degree of error.  The probability is that the

shotgun in the back of the cabin, the hunting knife on your buddy's waist,

the outboard motor you have strapped to the float or the extra set of

headphones will swing your compass more than having the plane on a trailer

or having the engine switched off.



We are flying relatively slow aircraft VFR.  That means we watch the ground

and make course corrections as necessary.  This is why as long as the

compass points in the general direction of north we can use it.  



While in this part of the world a magnetic compass is a primary navigation

instrument. It is also probably the least used instrument required.



Noel



 	  Quote: 	
		   

 Hum, if I had a seaplane, I think I would adjust the compass 

 by taxiing at say, 10 MPH, on the water, using the GPS set to 

 magnetic heading, as a reference. Of course, it's a two men's 

 job. My experience in both maritime and aviation magnetic 

 compass is that it is impossible to expect more than 5 

 degrees accuracy, which, IMHO, is good enough.

 

 Cheers,

 Michel

 

 

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 ww.matronics.com/Navigator?Kitfox-List</a>

 ics.com/contribution</a>

 

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_________________
Noel Loveys
Kitfox III-A
Aerocet 1100 Floats

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