This STC approves the Viking Air Limited DHC-6-300 landplane to operate in the commuter category, to takeoff at a maximum weight of 14,000 pounds and land at a maximum weight of 13,800 pounds, the installation of Pratt & Whitney Canada PT6A-34 engines rated at 750 SHP, and associated modifications View PDF on drs.faa.gov ↗

The STC PDF is authoritative: installation instructions, ICA requirements and limitations.