STC Structural Upgrade Offering For Bell 212, Bell 412 Helicopters The modification is an innovative structural upgrade designed to increase useful load, reduce maintenance burden, and improve overall aircraft efficiency, according to the company.The modification removes the original composite honeycomb baggage compartment in Bell 212 and 412 helicopters. Traditional honeycomb structures are susceptible to corrosion, moisture intrusion, and delamination, particularly in offshore and high heat environments. StandardAero replaces the composite honeycomb with a durable, aluminum sheet metal semi-monocoque design, transforming a maintenance intensive area of the aircraft into a stronger, lighter, and more economical solution.
