09/30/2013. Remarks by Johan Visschedijk: "In 1942, 27 Boeing 247Ds were drafted into the USAAF and given the military designation C-73. Some underwent varying degrees of modification while in service. A number were fitted with military Pratt & Whitney R-1340-AN-1 engines in place of the commercial S1H1G Wasps and fitted with two-blade propellers and cowlings from North American AT-6 series aeroplanes.

The C-73s were declared surplus in 1944 and were acquired by various private owners and small airlines, some regaining their original NC-13300 series registrations but most being given later numbers, especially those that were acquired by owners outside the USA and eventually sold to new American owners.

One additional 247D (c/n 1726, formerly a 247) was used for research in instrument and automatic landing systems by the RAF during WW II and carried the British serial DZ203. This followed a short period of service in the RCAF with Canadian serial 7655. A total of eight 247Ds were in the RCAF.

The pictured aircraft had a red tail, nose, and engine cowling, identifying it as an instrument trainer."