The ST-27 is a modification of the de Haviland Heron 2 carried out by Saunders Aircraft of Gimli, Manitoba in 1975. The conversion included lengthening the cabin by 8 ft. 6 in. to provide accommodation for a maximum of 23 passengers, rebuilding the wing to incorporate a redesigned main spar and replacing the four Gipsy engines by two 750 shp Pratt & Whitney PT6A-34 turbo prop engines. Production ended in when financial backing was withdrawn in 1976. Assets and rights to the aircraft were later taken over by Air Otonabee.
A total of 12 ST-27 conversions were completed by Saunders.
Only one ST-27 has ever crashed.
|001||CF-YBM-x||prototype, became ACES of Columbia as HK-1286|
|003||CF-FZR||became ACES of Columbia as HK-1299|
|004||CF-YAP||became ACES of Columbia as HK-1287|
|006||CF-LOL||ST. Andrews Airways|
|007||CF-CNT||Bayview Air Service|
|009||C-GCML||Skywest Airways, Voyageur Airways|