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For this, the partners and their electric Cessna plane need to make it through what would be the world's first Electric Cessna Caravan Supplemental Type Certificate (STC) program. They expect to complete the STC in early 2023.
An STC is a major modification (or repair) to an existing type certified aircraft approved by national aviation authorities. In the case of the E-Cessna, Sydney Seaplanes, one of Australia's largest seaplane operators, will then be able to offer the STC as a service to other Caravan operators in the region. They would, in turn, be able to convert and or use an electric Cessna just as they would use any other one. The principle is similar to Lightning Systems becoming a certified Ford conversion specialist.