Whats that key again?

I recently reset my main Flight Simulator configuration file and have had to change back all my custom key assignments to the keys that suited me, but I can't remember what the default one is for "Jet Engine Reversers" (or what ever it is called) and can't find it on the key assigment list.

Could someone tell me the proper name and key for that function please?

Cheers

_()&*(&^^* random screenshot attack! #%@@#)_+ :

lol