The Heinkel HD 27 was a mail-carrying transport built in Germany in the 1920s.
Operational history The HD 27 flew in 1925 and carried mail until 1928, when it was destroyed in a tornado. No more airframes were built, but the HD 27 formed the basis for the HD 39.Le Document aéronautique 1926-04. Heinkel HD27 (Avion postal)de Agostini. World Aviation. Heinkel: HD 25 - HD 44 Series Biplanes
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