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)) ACC releases Guard F-16C accident investigation report
Air Combat Command officials at Langley Air Force Base, Va., released the aircraft accident investigation report March 9 involving the Nov. 17 crash of an Air National Guard F-16C on the Jefferson Proving Ground Range near Madison, Ind.
The pilot, 1st Lt. Christopher Snider, ejected safely. Snider was flying as part of a four-ship surface attack tactics-training mission.
The aircraft was from the 113th Fighter Squadron at the 181st Fighter Wing, based at Terre Haute International Airport, Ind.
The report concluded the accident was caused by engine failure. According to the investigating officer, the accident occurred as a result of a defective compressor discharge pressure, or CDP, rotating air seal in the engine. The CDP malfunctioned because it did not have the required metallic bond coating applied to the teeth of the seal during the refurbishment process.
As a result, abrasive metal particles wore off the top coating of the teeth and flowed into a reduced air-flow cavity between the high-pressure turbine shaft and the inner wall of the forward inner nozzle support, or FINS. The trapped particles cut the inner wall of the FINS, causing the structure to weaken and eventually fail. The fracture allowed the high-pressure turbine nozzle to collapse on the turbine, causing the engine turbine to seize.