Why can transponders be turned off?

Sheesh, all this secrecy over transponder codes? This website is aimed at eliminating ignorance, not perpetuating it right? This is the same as saying “I could tell you the capital of Saskatchewan, but eyes reading this forum could misuse the information, besides it’s available for anyone to look up.” B)

Rant completed. Forgive me. It is free information that any pilot should be willing to offer. Being a pilot, I shall.

squak 7500 for a hijacking
squak 7600 for radio/communication failure
squak 7700 for general emergency/mayday

Hi mangeorge,

You know there are fighter jets flying the East Coast right now, don’t you? Who knows what they have permission to do or not do but they are the only airplane sound I’ve heard for a day or two.

Jois

Hi there, Jois.
Of course I’m aware of that. There are fighters in the air pretty much all the time. But we’re not talking about “Hey, that plane has been hijacked, Let’s shoot it down.”
Ok, since there seem’s to be some interest, I’ll start another thread. As if there aren’t plenty on this general subject already. :wink:
I shall call it ‘Logistics of shooting down a hijacked passenger jet’.
Peace,
mangeorge

And make sure you don’t inadvertently pass through any of those numbers while changing codes. That WILL be noticed.

And 7777 is a military code strictly forbidden to civilians, so avoid that one, too.

Now all the groundlings are going to want to what the “squawk” part of that statement means. They’ll think the box makes bird noises or something. (I think the WWII vintage ones did - but they’re silent, now)

The way I’ve heard it is that the first transponders in WWII were know colloquially as “parrots” because a parrot will repeat back anything you say to it. Anything these electronic parrots said was then referred to as a “squawk.”