On May 16, 1995, at 1138 hours mountain standard time, a Ryan Navion, N41151, crashed about 1/4-mile southwest of the departure end of runway 21 at Pulliam Airport, Flagstaff, Arizona. The pilot was beginning a visual flight rules personal flight to Whiteman Airpark, Pacoima, California, with an intended fuel stop at Kingman Airport, Kingman, Arizona. The airplane, registered to and operated by the pilot, sustained substantial damage. The certificated private pilot and his passenger, a certificated private pilot, sustained minor injuries. Visual meteorological conditions prevailed. The pilot reported in a telephone interview conducted on May 16, 1995, that the engine lost power shortly after the airplane lifted off the runway. The airplane landed on the edge of the runway and then rolled down the embankment. A pilot witness said in a telephone interview conducted on May 16, 1995, that he observed the airplane taking off while he was on final approach to runway 21. He said the airplane appeared to accelerate and lift-off normally; however, after the airplane lifted off, it appeared to decelerate when it reached 25 feet above the ground. The airplane landed on the side of the runway and then rolled down the embankment. The examination of the wreckage showed that one propeller blade had rotated about 90 degrees toward the feather position. During the removal of the propeller, the aircraft retriever discovered that one of the two pitch change rod end nuts was not fully tightened. The nut was on the control rod bolt about 3/16 of an inch. The engine case displayed the nut scrape marks and its associated propeller blade control rod was broken. The pilot told Safety Board investigators that the propeller was installed by Sunstate Propeller, Inc., Tampa, Florida. He sent a copy of a propeller logbook entry that he signed, but did not date, indicating Sunstate Propeller, Inc. (from now on called Sunstate Propeller), installed the propeller. Sunstate Propeller manager reported in a telephone interview and written statement that Sunstate Propeller did not install the propeller. He said that Sunstate Propeller sold the propeller to the pilot, a certificated aircraft mechanic with inspection authorization, and provided him with the necessary tools to install the propeller. He said that the pilot installed the propeller on or about May 12, 1995, at a facility in Lakeland, Florida. A Federal Aviation Administration (FAA) airworthiness inspector from the Scottsdale [Arizona] Flight Standards District Office reported that the airframe logbook entry does not show that Sunstate Propeller installed the propeller. The pilot signed, but did not date, the entry.