NTSB Identification: BFO88FA050.
The docket is stored on NTSB microfiche number 36553.
Accident occurred Thursday, May 26, 1988 in MIDDLETOWN, DE
Probable Cause Approval Date: 04/25/1989
Aircraft: ENSTROM F-28A, registration: N9209
Injuries: 2 Uninjured.

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.

SHORTLY AFTER TAKEOFF, AT AN ALT OF APRX 400 FT, A LOUD BANG WAS HEARD AND THE HELICOPTER DEVELOPED A MODERATE TO SEVERE VIBRATION. THE CFI TOOK CONTROL OF THE HELICOPTER AND INITIATED AN AUTOROTATION. THE HELICOPTER CONTACTED SMALL TREE BRANCHES AND LANDED HARD IN A FIELD. POST ACCIDENT INSPECTION REVEALED THE #3 CYLINDER CONNECTING ROD CAP HAD SEPARATED FROM THE CONNECTING ROD. THE FATIGUE FAILURE INITIATED AT THE BOLT HOLE IN THE YOKE SECTION OF THE ROD. SEVERE GALLING WAS VISIBLE ON THE FAILED CONNECTING ROD CAP AND YOKE.

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

ENGINE ASSEMBLY,CONNECTING ROD..FAILURE,TOTAL

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

ENGINE ASSEMBLY,CONNECTING ROD..FATIGUE



Contributing Factors

OBJECT..TREE(S)


Contributing Factors

LIGHT CONDITION..NIGHT

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