During 1992, the BK 117C-1, equipped with a revised EFIS panel and an improved environmental control system, along with greater hot-and-high performance, was introduced to service.
Durante o ano 1992 introducíuse o BK 117C-1, equipado cun panel EFIS revisado e un sistema de control ambiental mellorado, xunto cun maior rendemento en ambientes cálidos e altos.