basil, sorry but not all true,
-100 can have 2 apu gens (BA only had one for weight saving)
not all -200 have 1/2 pack settings, in fact 75% of the ones I work don't.
Don't the 100 and 200 have 17in wheels whereas the 300 has 19in wheels.
askop, minimun 2 a/p some have 3.
The only way I can tell if it is a -100 or -200 is if it is painted on the side.
As you can see from the interesting posts on here there doesn't seem to be many visual differences that could conclusively differentiate the 100 from the 200.
I can state for sure that the a/c I did today was a -400 (or can I really be sure!!)
