Thanks for your reply. I'm not sure what you are saying here. The FAA designation on our ICAO flight plans read "B721/M-SDFGHIRWXYZ/S".
The STC is listed as SA4363NM in the AFM. It has two -217C engines in 1 and 3, and a -9A in the #2 position. WSI winglets and the Dougan (sp?) droop. The STC is 'owned' by BF Goodrich. I contacted them about a year ago, but they had no idea what I was asking.
Would you have a link to the Rohr service letter?
Is the contact you listed still good? I'd love to speak with someone who is familiar with the STC.
Thanks!