Amendment of Service and Eligibility Rules for FM Broadcast Translator Stations, Report and Order (R&O), MB Docket 07-172, FCC 09-59, released June 30, 2009. FM translator station rules were amended to allow AM broadcast stations to retransmit their signals over FM translators. AM Class D ‘daytimer’ stations may originate programming on FM translators during periods when the AM signal is off the air.
The full document is here: http://www.fcc.gov/fcc-bin/audio/FCC-09-59A1.doc