NTSB Identification: ATL82IA281
14 CFR Part 91: General Aviation
Incident occurred Wednesday, September 15, 1982 in MONTGOMERY, AL
Probable Cause Approval Date: 09/15/1983
Aircraft: PIPER PA-34-22OT, registration: N220HB
Injuries: 2 Uninjured.

NTSB investigators used data provided by various sources and may not have traveled in support of this investigation to prepare this aircraft incident report.

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.

The National Transportation Safety Board determines the probable cause(s) of this incident to be:

PROPELLER SYSTEM/ACCESSORIES,COUNTERWEIGHT..OVERTORQUE

The National Transportation Safety Board determines the probable cause(s) of this incident to be:

PROPELLER SYSTEM/ACCESSORIES,COUNTERWEIGHT..SEPARATION

The National Transportation Safety Board determines the probable cause(s) of this incident to be:

PROCEDURES/DIRECTIVES..NOT CORRECTED..MANUFACTURER

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