Tidewater Inc.

Ref: Dassault Aviation Docket No. FAA-2012-1067; Directorate Identifier 2011-NM-231-AD. Operator od F2000EXEASy s/n 112 My concerns are that we have already complied with the original version of S/B F2000EX-171. The FAA would need to take that into consideration when wording the Airworthiness Directive. Revision one, two and three all apply to training. In Rev 3 of the Service Bulletin 171, it states that Rev 1, Rev 2 and Rev 3 are not appicable to aircraft already modified per the original issue. I suggest that this fact be stressed in the AD to eliminate confusion.