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#1
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Altimeter discrepancy
Y'all,
I have been flying in an aircraft where ATC has occasionally mentioned that there is a 3-4 hundred discrepancy betwee our communicated altitudes and that of our blind encoder. We have acknowledged the difference. The altimeters were certified some 300 miles away only three months ago. ATC has accepted continuation of our flights using our indicated altitudes not those of the blind encoder. The transponder altituded gives encoder altitudes.. What do the FARs require? What are the options? What warranty on altimeter work and for how long? Opinions wanted. Gene Whitt |
#2
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Why do you think that it is your altimeter? Does it match field elevation
with the current altimeter setting? Mike MU-2 "Gene Whitt" wrote in message k.net... Y'all, I have been flying in an aircraft where ATC has occasionally mentioned that there is a 3-4 hundred discrepancy betwee our communicated altitudes and that of our blind encoder. We have acknowledged the difference. The altimeters were certified some 300 miles away only three months ago. ATC has accepted continuation of our flights using our indicated altitudes not those of the blind encoder. The transponder altituded gives encoder altitudes.. What do the FARs require? What are the options? What warranty on altimeter work and for how long? Opinions wanted. Gene Whitt |
#3
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Mike,
Thanks for the reminder... Fortunately everything is still under new aircraft warranty. Will check papers to see kind of blind encoder feeding the transponder. Gene "Mike Rapoport" wrote in message nk.net... Why do you think that it is your altimeter? Does it match field elevation with the current altimeter setting? Mike MU-2 "Gene Whitt" wrote in message k.net... Y'all, I have been flying in an aircraft where ATC has occasionally mentioned that there is a 3-4 hundred discrepancy betwee our communicated altitudes and that of our blind encoder. We have acknowledged the difference. The altimeters were certified some 300 miles away only three months ago. ATC has accepted continuation of our flights using our indicated altitudes not those of the blind encoder. The transponder altituded gives encoder altitudes.. What do the FARs require? What are the options? What warranty on altimeter work and for how long? Opinions wanted. Gene Whitt |
#4
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Gene Whitt wrote:
The altimeters were certified some 300 miles away only three months ago. Last May I had my altimeter and encoder certified as part of the two-year requirement. During a flight soon after, I was told by ATC that our transponder-sent altitude was off about 400 feet when compared to the altimeter. After pointing this out to the shop who certified the aircraft, they discovered that their altimeter that they use to certify aircraft had a 400 foot error in it. Nice... -- Peter ----== Posted via Newsfeeds.Com - Unlimited-Uncensored-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups ----= East and West-Coast Server Farms - Total Privacy via Encryption =---- |
#5
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The Octal (Base 8) sections of the xponder could be out of alignment and
therefore output off by the 3-400 ft. you mention. It c/b on their end although, I only remember "not receiving you mode C." -- Thx, {|;-) Victor J. (Jim) Osborne, Jr. "Gene Whitt" wrote in message k.net... Y'all, I have been flying in an aircraft where ATC has occasionally mentioned that there is a 3-4 hundred discrepancy betwee our communicated altitudes and that of our blind encoder. We have acknowledged the difference. The altimeters were certified some 300 miles away only three months ago. ATC has accepted continuation of our flights using our indicated altitudes not those of the blind encoder. The transponder altituded gives encoder altitudes.. What do the FARs require? What are the options? What warranty on altimeter work and for how long? Opinions wanted. Gene Whitt |
#6
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Peter R. wrote: After pointing this out to
the shop who certified the aircraft, they discovered that their altimeter that they use to certify aircraft had a 400 foot error I assume test equipment like this needs to be calibrated against some NBS-traceable standard on some periodic basis? |
#7
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I received an ATC notification during one flight that my altimeter was
1000' off. They actually had me turn off the altitude encoding. This, by the way, occured shortly after having my plane in to the avionics shop for some repairs. Turned out, when they put one of the instruments back in the panel, they introduced a kink in the static line. I replaced the kinked section with a new hose and everything worked fine... |
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