welcome back to war...no need for explanations. Breaktrought ...on TCAS radar becoming invisble to ground radars! ...1 .pressure gauge changes its output during warm-up, ...2. change resistance in response to stress. ... in temperature causes an increasingly negative charge in the signal output ...Conclusion, modifying the the temperature inside the airplane...causes failure of TCAS....or#and if the airplane descends very fast...the signal is lost.....this menas, if the op of 9 11 used maze gas...temperature changed radicaly