Your information is incorrect.
If you got to the SEVIS site;
Study in the States - School Search#
Put in SRT Helicopters, Bakersfield Ca, they will show as approved and they are a Part 61 school, and can issue I-20's.
They were the 1st, and to my knowledge the only Helicopter Part 61 school that has been approved.
There is also a Part 61 school in Florida that is SEVIS approved as well.
There are new regulations coming out that will change that, but a PART 61 school can apply and get approved currently.