A Garrett TPE331 turbo conversion conceived by the US Fish & Wildlife Service office at Anchorage as a long-range survey aircraft, a 40 inch fuselage extension allowed two extra seats in the cockpit. The aircraft was re-registered as N92MT in October 1993, exported to Chile as CC-CTG in September 1994, reverted to N92MT in May 1995, changed to N86MT in January 1996, and finally re-registered as N221AG in June 2001. Sadly it was destroyed on 27th February 2011 when it crashed on take-off from Al Ain International Airport in the United Arab Emirates. Note F&WS Goose N789 in the background.

Converted by the US Fish & Wildlife Service to turbine power in 1971. Received a 40 inch fuselage extension in late 1974. Similar to but not identical to the McKinnon Turbo Goose. Reregistered N92MT in 1993.