MONTGOMERY, AL, USA
N220HB
PIPER PA-34-22OT
THE PILOT STATED THAT A NORMAL RUNUP WAS COMPLETED BEFORE TAKEOFF. DURING THE TAKEOFF ROLL, THE AIRCRAFT ACCELE- RATED THROUGH 75 KNOTS WHEN A LOUD BANG WAS HEARD FROM THE LEFT SIDE. THE TAKEOFF WAS ABORTED AND A ROLLOUT ACCOMPLISHED. EXAMINATION OF THE LEFT ENGINE REVEALED THAT ONE OF THREE LEFT PROPELLER COUNTERWEIGHTS WERE MISSING. EACH COUNTERWEIGHT IS SECURED BY A SINGLE BOLT AND LOCKING NUT. EXAMINATION OF THE BOLT TUB REVEALED EVIDENCE OF PRE-LOAD STRESS. A SERVICE BULLETIN WAS ISSUED ON MARCH 03 1982, STATING THAT TO REDUCE PRE-LOAD STRESS ON THE COUNTERWEIGHT BOLT, THE TORQUE SPECIFICATION HAS BEEN REDUCED FROM 105-100 FOOT POUNDS TO 65-60 TORQUE POUNDS.
Source: NTSB Aviation Accident Database
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