Operational question

[Markieboy]

Hello all,

I am studying for my 4 bar exam and have been playing with scenario's etc. One of the questions I haven't been able to answer is this:

Am I allowed (EU-OPS wise) to embark/disembark pax with an engine running (737)?

I am aware it is potentially very dangerous and I am not asking whether or not one should do this, I am merely looking to where the law stands on this.

Thanks,

Mark