There you are. Aloft in your mighty aerial conveyance, full of vital information (amongst other things) and suddenly the urgent need arises to communicate some especially vital, useful and generally good thing through the ether to a waiting world. You reach down to adjust Mr. Marconi’s Magic Box, press the necessary push-to-talk switch and you got…
Nothing. Nada. Zip. Bupkis. Words not only fail you, you can’t even remember what it was you were going to say. To whom. Why you were going to say it. Your face goes red, you start to stammer, “uh, uh, uh,” over the radio waves emanating from your aerocraft and your head feels like it’s alight. If you are especially unlucky, you have others aboard, also watching with mixed feelings of amusement and schadenfreude at your rapidly deteriorating dilemma.
You have HELMET FIRE!
Relax. There’s a checklist for that: