NTSB Identification: FTW88IA147.
The docket is stored on NTSB microfiche number 38708.
Incident occurred Wednesday, August 10, 1988 in OKLAHOMA CITY, OK
Probable Cause Approval Date: 06/11/1990
Aircraft: PIPER PA-31-350, registration: N3589B
Injuries: 3 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 FLIGHT WAS AN INSTRUCTIONAL FLIGHT WITH THREE PILOTS ONBOARD. THE AIRPLANE DEPARTED ON RUNWAY 17R AND WAS 300 TO 400 FEET AGL WHEN ONE BLADE OF THE RIGHT PROPELLER SEPARATED FROM THE HUB, FOLLOWED BY THE REMAINDER OF THE PROPELLER. THE PIC MADE AN IMMEDIATE RIGHT TURN AND ENTERED DOWNWIND FOR RUNWAY 12, AND THEN LANDED ON THAT RUNWAY. EXAMINATION REVEALED FRACTURE RESULTED FROM FATIGUE CRACKS THAT INITIATED AT THE GREASE HOLES IN THE FORWARD HALF OF THE PROPELLER HUB.
The National Transportation Safety Board determines the probable cause(s) of this incident to be:PROPELLER SYSTEM/ACCESSORIES,HUB..FATIGUE
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