willantis
I was referring to Emergency Airworthiness Directives (EAD) of which there have only been two since the MD900 series came into service.
The other one that you refer to is an Airworthiness Directive (AD) that was issued in June 2008. There have actually been 17 other AD's that relate to the MD900 series but this is not unusual. Most types, both fixed wing and rotary, have a number of AD's that have affected them at some time or other.