Straight from the FAA website:
Frequently Asked Questions
Where do I send my Notification Letter (MS Word) ?
Send the letter to:
Federal Aviation Administration (FAA)
Security and Investigations Division (AMC-700)
P.O. Box 25810
Oklahoma City, OK 73125
or
Fax to (405) 954-4989
Do I have to report anything other than alcohol-related convictions?
Yes, under
14 CFR Part 61, you must report alcohol-related administrative actions, whether a conviction took place or not. Administrative actions and convictions are also reportable under
Part 67, the airman application for a medical certificate.
If the charge of Driving Under the Influence (DUI) is reduced to Reckless, Careless, or Negligent driving by the court, do I have to report it?
No, we do not consider a conviction for Reckless, Careless, or Negligent Driving a reportable motor vehicle action (MVA). However, you must report the first suspension, if any.
How long do I have to report my alcohol-related motor vehicle action (MVA)?
You have 60 days from the effective date of the administrative action (driver license suspension, revocation, or cancellation) or conviction. (The 60-day period
does not begin with the arrest date.)