| Boeing 247 | |
|---|---|
 United Air Lines Boeing 247D in flight | |
| General information | |
| Type | Passenger airliner |
| National origin | United States |
| Manufacturer | Boeing |
| Status | Retired |
| Primary user | Boeing Air Transport |
| Number built | 75[1] |
| History | |
| Introduction date | May 22, 1933[2] |
| First flight | February 8, 1933 |
The Boeing Model 247 is an early American airliner, and one of the first such aircraft to incorporate advances such as all-metal (anodized aluminum) semimonocoque construction, a fully cantilevered wing, and retractable landing gear.[3][4] Other advanced features included control surface trim tabs, an autopilot and de-icing boots for the wings and tailplane.[5] The 247 first flew on February 8, 1933, and entered service later that year.[6]
- ^ Boeing Products: Model 247/C-73 Transport, p.39
- ^ Cite error: The named reference
Bryan p. 109was invoked but never defined (see the help page). - ^ "Model 247 Commercial Transport." Archived January 18, 2008, at the Wayback Machine boeing.com, 2009. Retrieved: June 14, 2010.
- ^ van der Linden 1991, pp. xi–xii.
- ^ Bryan 1979, p. 110.
- ^ Gould 1995, p. 14.