This report describes Phase I and shakedown testing and the results obtained in the bench testing of the 5-3/8 inch Maurer turbo drill. This work was performed under Contract No. DE-AC21-78MC08089 for the Methane Recovery from Coalbeds Project of the Morgantown Energy Technology Center(METC) of the Department of Energy (DOE). The turbo drill was built by Maurer Engineering, Inc. (MEI) under Contracts EY -77-C-21-8093 and EM-78-C-21-8380 with DOE/METC. Phase I testing was conducted at TRW Mission Manufacturing Company in Houston, Texas, according to the Test Plan appended to this report.