is a critical maintenance document that addresses the inspection and potential replacement of cracked nutplates in the vertical fin attachment area of various Cessna single-engine aircraft. Issued to ensure structural integrity, this letter is primarily associated with Airworthiness Directive (AD) 80-11-04 , which mandates recurring inspections to prevent catastrophic tail assembly separation. Purpose and Technical Scope
If you are maintaining a Cessna 172, 182, 206, or a host of other popular models manufactured between the mid-1970s and early 1980s, you have likely encountered this document in your logbooks. But is it mandatory? What exactly does it address? And what happens if you ignore it? Cessna Service Letter Se79 49