NTSB Identification: NYC83FU009.
The docket is stored on NTSB microfiche number 25568.
Accident occurred Friday, August 05, 1983 in MAYVILLE, NY
Aircraft: AMERICAN AEROLIGHTS EAGLE XL, registration: NONE
Injuries: 1 Fatal.

NTSB investigators either traveled in support of this investigation or conducted a significant amount of investigative work without any travel, and used data obtained from various sources to prepare this aircraft accident report.

ACCORDING TO WITNESSES, THE ULTRALIGHT WAS IN LEVEL FLT AT APRX 150 TO 200 FT AGL WHEN THEY HEARD A LOUD BANG. SHORTLY THEREAFTER, THE ENG NOISE CEASED & THE VEHICLE ENTERED A SPIRALING DESCENT & CRASHED. A RIP IN THE WING CENTER SECTION WAS SEEN PRIOR TO IMPACT. AN EXAM REVEALED THAT THE LARGE REDUCTION ASSEMBLY, DRIVE PULLEY HAD SEPARATED FROM THE DRIVE SHAFT. 2 OF 4 CONNECTING BOLTS WERE FOUND FRACTURED & THE OTHER 2 HAD SEPARATED WITHOUT FRACTURING. THERE WAS EVIDENCE OF LOOSENESS & FRETTING PRIOR TO THE BOLT FAILURES. RED PAINT HAD TRANSFERRED FROM THE PROP TIPS TO THE WING STRUTS. THEPROP TIPS HAD SEPARATED & THE WING FABRIC HAD TORN AT THE WING ROOTS ON EACH SIDE OF THE CENTER SECTION. THE FAILED & MISSING BOLTS HAD BEEN INSTALLED DURING A DRIVE SHAFT PULLEY ADAPTER HUB RETROFIT, APRX 3 FLT HRS PRIOR TO THE ACCIDENT,BEFORE THE PLT PURCHASED THE ULTRALIGHT FROM A PREVIOUS OWNER. NO WASHERS, TORQUE VALUES OR SAFETYING REQUIREMENTS WERE SPECIFIED FOR THE BOLTS IN THE RETROFIT INSTRUCTIONS & THE BOLTS HAD NOT BEEN SAFETY WIRED.

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

REDUCTION GEAR ASSY..OTHER

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

MAINTENANCE,INSTALLATION..IMPROPER..OTHER MAINTENANCE PERSONNEL

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

ACFT/EQUIP,INADEQUATE DESIGN..PRODUCTION/DESIGN PERSONNEL

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

REDUCTION GEAR ASSY..FAILURE,TOTAL


Contributing Factors

REDUCTION GEAR ASSY..DISCONNECTED


Contributing Factors

PROPELLER SYSTEM/ACCESSORIES..VIBRATION


Contributing Factors

WING..FAILURE,PARTIAL

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