whirlygig is spot on... the vast majority of knowledge you actually use does seem to be at ppl level. The amount of utterly extranious crap involved with some of the atpl stuff is imho completely unnecessary, unless of course you fancy doubling up as an engineer, which i don't.
eg: a green fusible plug is designed to deflate the tyre if a temperature of _____ is reached?
a. 177 degrees celcius
b. 277 degrees celcius
c. 155 degrees celcius
d. 199 degrees celcius
e. i don't give a ****, where's the cute blonde hostie.