A new term might soon join the lexicon of the FAA–“Complex STC.” According to the FAA, there have been STC-approved installations that have been “inappropriate” because the approval has not been compatible with already modified versions of the base aircraft model for which the STC applies. No examples were immediately available. “We need a more rigorous compatibility evaluation for certain STCs [Complex STCs] to ensure the modified aircraft will be airworthy,” the FAA said. Comments on the proposal are due by February 12. Copies of the proposed policy are available at www.airweb.faa.gov/rgl or by calling the FAA at (202) 267-3549.