MATTAPAN, MA, USA
N85HB
PIPER PA-31T2
THE PLT NOTED AN OVER TORQUE CONDITION IN THE LEFT ENG AS THE ACFT WAS ON AN ILS APCH. HE MADE A GO-AROUND & INITIATED ANOTHER APCH WITH THE ENG SHUT DOWN. HE WAS UNABLE TO MAINTAIN ALT & THE ACFT BEGAN A DECENT THAT WAS NOT ARRESTED. SUBSEQUENTLY, IT CRASHED INTO 2 HOMES, APRX 6 MI FROM THE ARPT. AN EXAM OF THE LEFT ENG REVEALED THE DRIVE SHAFT FROM THE FUEL PUMP TO THE FUEL CONTROL WAS SHEARED AT THE PLASTIC COUPLING. FURTHER EXAM REVEALED THE TWIN BEARINGS THAT SUPPORTED THE DRIVESHAFT HAD FAILED. ALSO, THERE WAS EVIDENCE THE DRIVE SHAFT HAD SHIFTED & SUBSEQUENTLY AN OVERTORQUE CONDITION RESULTED.
THE PILOT'S IMPROPER IN-FLIGHT PLANNING/DECISION, WHICH RESULTED IN HIS FAILURE TO MAINTAIN CONTROL OF THE AIRCRAFT. FACTORS RELATED TO THE ACCIDENT WERE: FAILURE OF THE LEFT FUEL CONTROL UNIT, AND THE ADVERSE WEATHER CONDITIONS.
Source: NTSB Aviation Accident Database
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