Designation: U-11A

Piper U-11A

Piper U-11A Aztec

A picture of the Piper U-11A Aztec

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.

Service History:

Built by Piper Aircraft Company, Lock Haven, Pennsylvania and delivered to the U.S. Navy on October 25, 1960.

October 1960              To Alameda Naval Air Station, California.

March 1976                 To North Island Naval Air Station, California.

November 1976          To Davis-Monthan AFB, Arizona for storage.

December 1982   Loaned to Pima Air and Space Museum by the National Naval Aviation Museum.

Wingspan 37 ft 1 in.


Length 30 ft 3 in.


Height 10 ft 3 in.


Weight 5,200 lbs (loaded)


Max. Speed 277 MPH

Maximum Speed

Service Ceiling 19,800 ft

Service Ceiling

Range 1,180 miles


Engines Two Lycoming O-540-AIA with 250 horsepower each


Crew 2 with 4 passengers



Alameda Naval Air Station, 1976


Serial Number

Pima Air & Space Museum

Creating unlimited horizons in aerospace education through the preservation and presentation of the history of flight.

Charity EIN: 86-6031135

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