Documentation for ATR MOD 7979 allowing weight increases for operations on unpaved runways.
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a specific 2021 PDF manual titled exactly "Maintenance 80" for the ATR 72-600 is not publicly hosted as a single story or download
: Detailed overview of how to use the manual, including job instruction cards (JIC), task code designations, and revision policies .
The year 2021 marked a significant turning point for ATR maintenance. ATR introduced the , which revolutionized operating economics by extending engine overhaul intervals to 20,000 hours .