Not quite correct training wheels. That is for aircraft over 12,500lbs.
Negative mate, the ruling makes no specification for aircraft type. I've seen it myself and yes, I'm fluent in Bahasa Indonesia and I have also spoken to a DGCA official about it. Having said that, some companies (mainly part 135 and part 141) have been given exemptions from the rule.
Here it is, for anyone wishing to read it. It's addressed to all airline and charter operators,(part 121 and part 135) in Indonesia.
AU.403/1/1/DJPU.DKUPPU/2013