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I didn't fill in the rest of the table, but look at the TAS for Vne=274 at
25000'


 ALT  TEMP    Mach    0.52M Vne   Vne
 (ft)  (C)  Kts    Kts Kts Kts
 True    True IAS   True
 0 15  660    343 274
 10K -4.8  638    332 274
 15K -14.7  627    326 274
 20K -24.6  614    319 274
 25K -34.5  602    313 274   410 .68M
 30k -44.4  590     307 274
 35k -54.3  577    300 274


M= .52 gives a Vne (indicated) of approximately 208KIAS at 25000.

Regards,  George Braly
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