NTSB Identification: ATL88LA232.
The docket is stored on NTSB microfiche number 38431.
Accident occurred Saturday, August 20, 1988 in PADUCAH, KY
Probable Cause Approval Date: 01/04/1990
Aircraft: HILLER UH-12A, registration: N4828E
Injuries: 1 Serious.

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

AFTER DEPARTURE THE ENG QUIT & PIC MADE AN AUTOROTATIVE LANDING IN A WOODED AREA. INITIAL EXAM OF ENG REVEALED WATER IN THE CARB FLOAT BOWL. INVESTIGATION SHOWED HELO HAD 100 HR INSPECTION RECORDED IN THE LOG, BUT MAY HAVE BEEN RETURNED TO SERVICE BY MECHANIC WITHOUT INSPECTION AUTHORIZATION AS AN ANNUAL INSPECTION. HELO RECORDS WERE OBTAINED BY ONE OF THE MECHANICS FROM THE SAME REPAIR STATION, BUT NOT GIVEN TO FAA INSPECTOR & LATER LOST. LATER EXAM OF THE ENG SHOWED HOLES IN ACCESSORY CASE. PARTIAL TEARDOWN SHOWED THAT THE LEFT MAG DRIVE COUPLING NUT COTTER KEY WAS MISSING. IT IS BELIEVED THE COTTER KEY WAS NOT INSTALLED OR WAS DAMAGED DURING INSTALLATION & BACKED OUT OF THE NUT ALLOWING THE NUT TO BACK OFF & THE DRIVE COUPLING TO DISCONNECT. THE PLT DID NOT FILE AN ACC REPORT. THE PLTS LOG BOOKS HAVE NOT BEEN LOCATED. THE ACFT ROLLED OVER AFTER LNDG.

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

ACCESSORY DRIVE ASSY,DRIVE GEAR..DISCONNECTED

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

IGNITION SYSTEM,MAGNETO..FAILURE,TOTAL

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

MAINTENANCE,OVERHAUL..IMPROPER..OTHER MAINTENANCE PERSONNEL


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