NTSB Identification: LAX85FA078.
The docket is stored on NTSB microfiche number 27268.
Accident occurred Thursday, December 20, 1984 in CORONA, CA
Aircraft: GRUMMAN AA-5B, registration: N74463
Injuries: 2 Serious.

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.

DURING MAINT OF THE ENG, & JUST BEFORE THE ANNUAL INSPECTION WAS SIGNED OFF, SOMEONE PARTIALLY LOOSENED & THEN ATTEMPTED TO TIGHTEN THE BOLT SECURING THE CRANKSHAFT GEAR TO THE CRANKSHAFT. THE OLD LOCKPLATE WAS NOT REPLACED & WAS NOT PROPERLY SECURED ABOUT THE BOLT. AS A RESULT OF A LOOSE BOLT THE DOWEL PIN, ALIGNING THE GEAR WITH THE CRANKSHAFT, THE GEAR SHIFTED POSITION & THE ENGINE STOPPED. THE PLT FAILED TO LOWER THE WING FLAPS, & STRUCK A DIRT DITCH SHORT OF HIS INTENDED EMERG LANDING SITE.

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

ENGINE ASSEMBLY,OTHER..FAILURE,TOTAL

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

ENGINE ASSEMBLY,OTHER..FATIGUE

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

EMERGENCY PROCEDURE..IMPROPER..PILOT IN COMMAND

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

MAINTENANCE,ANNUAL INSPECTION..INADEQUATE..OTHER MAINTENANCE PERSONNEL


Contributing Factors

TERRAIN CONDITION..DIRT BANK/RISING EMBANKMENT

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