In 1974, the original Metro models were replaced by the SA-226 TC Metro II after about 30 Merlin IVAs has been built. Among the changes made were larger, squared-oval windows and optional provision for a small Rocket-Assisted Take Off (RATO) rocket in the tail cone, this being offered to improve takeoff performance out of "hot & high" airfields in the event of an engine failure.

 

 

 

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