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The Piper PA-23 was one of the first twin-engine light aircraft available in the United States. It was introduced in 1954 as the four-seat Apache. The popularity of the design led Piper to develop the larger six-seat Aztec that also incorporated more powerful engines. In 1960, the U.S. Navy purchased twenty Aztecs for use as short-range transports designating them UO-1. They were also used to allow Navy pilots who had been assigned non-flying duties to maintain their skills and flight pay. The designation was changed in 1962 to U-11. The Aztecs remained in Navy service until the mid-1970s.
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| Wingspan |
37 ft 1 in |
| Length |
30 ft 3 in |
| Height |
10 ft 3½ in |
| Weight |
5,200 lbs (loaded) |
| Maximum Speed |
277 mph |
| Service Ceiling |
19,800 ft |
| Range |
1,180 miles |
| Engines |
2 Lycoming IP-540 with 250 hp each |
| Crew |
2, 4 passangers |
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