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meritflyer · October 3rd, 2006, 02:43

I'd definately rely on your altimeter. If you were assigned 10,000' you'd never want to fly according to your xpdr. Make sure your altimeter is correct though and there is no error within your pitot static system or local altimeter setting. The pressure differential is computed by ATC not your xpdr. A pressure altitude reading is sent to ATC where it is then adjusted by their computers which have the current altimeter setting.

October 3rd, 2006, 02:43	#9
meritflyer Old Skool Join Date: Dec 2005 Location: Winchestertonfieldville Posts: 6,803	Re: Question about Mode C I'd definately rely on your altimeter. If you were assigned 10,000' you'd never want to fly according to your xpdr. Make sure your altimeter is correct though and there is no error within your pitot static system or local altimeter setting. The pressure differential is computed by ATC not your xpdr. A pressure altitude reading is sent to ATC where it is then adjusted by their computers which have the current altimeter setting. __________________ The simplest answer tends to be correct.