Shawnee, OK, USA
N7171P
PIPER PA-24-250
The pilot was conducting the second leg of the airplane’s first flight after a recent engine overhaul. On final approach, the pilot lowered the landing gear handle; however, he did not receive confirmation that the landing gear was down. The pilot stated that he applied a lot of force to conduct the manual gear override but that he was not able to get the handle up. Shortly thereafter, the engine lost power. The airplane was substantially damaged during the subsequent forced landing. A postaccident examination of the airplane revealed that the mixture cable was bent, the cable was pulled from its last clamp prior to the carburetor mixture control, and the mixture control was pulled into the cutoff position. The routing of the mixture cable did not match assembly drawings, and several clamps used to route the mixture cable were missing. A grease fitting on the over-center link for the nose landing gear was in line with the bend in the mixture cable. Most likely, the landing gear center link became entangled in the mixture control cable, which prevented the nose landing gear from extending. The mixture likely came to idle when the pilot used extra force to try to extend the landing gear. The mixture cable was not installed properly during the recent engine overhaul.
On May 14, 2012, approximately 1330 central daylight time, a Piper PA-24-250 airplane, N7171P, was substantially damaged during a forced landing to a field near Shawnee, Oklahoma. The private pilot was not injured. The airplane was registered to and operated by a private individual under the provisions of 14 Code of Federal Regulations Part 91 as a ferry flight. Visual meteorological conditions prevailed for the flight, which operated without a flight plan. The flight originated from Sundance Airpark (KHSD), Oklahoma City, Oklahoma, approximately 1315, and was en route to Shawnee Regional Airport (KSNL), Shawnee, Oklahoma. On final approach, the pilot lowered the landing gear handle; however, he did not receive confirmation that the landing gear was down and locked. The pilot stated that "a lot of force" was required to conduct the manual gear override, but he was not able to get the handle up. Shortly thereafter, the engine lost power. The pilot performed a gear up, forced landing to a field. During the landing, the right wing was buckled and the firewall was wrinkled. According to the Federal Aviation Administration inspector who traveled to the scene, the mixture cable was bent and would not move. The routing of the mixture cable did not match assembly drawings. The mixture cable was found separated from its last clamp prior to the carburetor mixture control and the mixture control was found in the cutoff position. He also noted that several clamps normally used to route the mixture cable were not present. A grease fitting on the over center link for the nose landing gear was in line with the bend in the mixture cable. According to the pilot, the engine had just been removed and reinstalled for an engine overhaul.
The improper installation of the mixture cable by maintenance personnel, which allowed the mixture cable to entangle with the landing gear during gear extension and led to the subsequent loss of engine power.
Source: NTSB Aviation Accident Database
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