NTSB Identification: NYC92LA076.
The docket is stored on NTSB microfiche number 45898.
Scheduled 14 CFR operation of TRANS WORLD AIRLINES
Accident occurred Wednesday, April 08, 1992 in DAYTON, OH
Probable Cause Approval Date: 06/11/1993
Aircraft: MCDONNELL DOUGLAS DC-9-32, registration: N926L
Injuries: 1 Fatal,28 Uninjured.

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

THE LEFT SIDE NOSE WHEEL TIRE WAS DAMAGED DURING PUSHBACK, WHEN THE TOW BAR FAILED. THE TIRE WAS REPLACED AND WHILE BEING SERVICED ON THE AIRPLANE, THE TIRE RIM FAILED, FATALLY INJURING THE MECHANIC. EXAMINATION OF THE BOTTLE USED TO SERVICE THE TIRE SHOWED TWO PRESSURE SCALES, BARS ON THE OUTSIDE AND PSI ON THE INSIDE. ONE BAR EQUALS 14.7 PSI. THE HIGH END OF THE SCALE WAS 10,000 PSI AND THE BOTTLE WAS PRESSURIZED TO 4000 PSI. THE TIRE WAS TO BE SERVICED TO 150 PSI. A CHECK OF THE REGULATOR AFTER THE ACCIDENT DISCLOSED IT WAS PROPERLY CALIBRATED. ACCORDING TO THE FAA, THE TIRE RIM WAS STRESSED TO 580 PSI. EXAMINATION OF THE FRACTURE SURFACE FOUND, 'NO...MANUFACTURING OR MATERIAL DEFECTS...FRACTURE SURFACE IS CONSISTENT WITH A TENSILE OVERLOAD TYPE OF FAILURE.' ACCORDING TO THE COMPANY, NO LOW PRESSURE REGULATORS WERE AVAILABLE. THEY ARE KEPT UNDER LOCK WHEN NOT IN USE AND THE RESPONSIBLE PERSON HAD ALREADY GONE HOME FOR THE DAY.

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

A FAILED WHEEL RIM FOLLOWING AN INADVERTENT OVER INFLATION BY THE MECHANIC. ADDITIONAL CAUSES WERE THE FAILURE OF THE MECHANIC TO BE AWARE OF THE PRESSURE BEING USED AND HIS FAILURE TO FOLLOW PROCEDURES. A FACTOR RELATED TO THE ACCIDENT WAS THE FAILURE OF THE COMPANY TO MAKE AVAILABLE LOW PRESSURE REGULATORS FOR THEIR MECHANICS DURING NORMAL WORK HOURS.

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