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Jul 16, 2015 at 14:42 vote accept FreeMan
Jul 16, 2015 at 1:42 comment added UnrecognizedFallingObject P.S. the original TSO-C10 (and I presume C10b) does mandate that a TSO'ed sensitive altimeter have a Kollsman window for setting the barometric pressure (the TSO has always punted to a SAE standard, but the original actually includes a copy while the B revision just says "go see SAE standard bla".)
Jul 15, 2015 at 22:17 comment added voretaq7 @IanF1 Re: adjusting altimeters in flight by adding/subtracting the number of feet corresponding to the pressure difference you could certainly do that: Write it down and do the math. We'd screw it up pretty universally though (most folks would know "0.1 inches of mercury is about 100 feet", but actually it's 87 feet and some change - that can be a noticeable difference over a medium-length flight).
Jul 15, 2015 at 22:16 comment added voretaq7 @IanF1 Fixed (I thought I stole two altimeters marked in millibars, guess I didn't :-)
Jul 15, 2015 at 22:13 history edited voretaq7 CC BY-SA 3.0
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Jul 15, 2015 at 21:23 comment added IanF1 Re the non-Kollsman meters, presumably one could adjust them in flight by keeping track of the pressure changes and adjusting the meter by the matching number of feet?
Jul 15, 2015 at 16:20 history edited voretaq7 CC BY-SA 3.0
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Jul 15, 2015 at 16:09 history answered voretaq7 CC BY-SA 3.0