NTSB Identification: BFO85FA049.
The docket is stored on NTSB microfiche number 31601.
Accident occurred Friday, May 31, 1985 in MILFORD, VA
Aircraft: Bell 222U, registration: N3180K
Injuries: 4 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.

THE HELO WAS IN LEVEL CRUISE FLT AT 1500 FT AND 115 KTS WHEN THE NO. 2 ENG CHIP LIGHT ILLUMINATED, ACCOMPANIED BY LOWERING OIL PRESSURE. THE PLT REDUCED PWR AND STARTED A RT TURN TO RETURN TO BASE WHEN HALF WAY THRU THE TURN A LOUD BANG OCCURRED FOLLOWED BY COMPLETE POWER LOSS OF BOTH ENGINES AND ENG CMPT FIRE. A SUCCESSFUL AUTOROTATION ENSUED, AND THE FIRE WAS EXTINGUISHED WITH THE ACFT SYSTEM AFTER LNDG. LATER EXAMINATION REVEALED THAT THE NO. 3 BEARING HAD FAILED. ULTIMATELY RELEASING THE PWR TURBINE ASSY FROM THE ENG. THE TURBINE DISC WELDED TO THE TAILPIPE CENTER BODY, FAILING THE DISC. FRAGMENTS STRUCK THE NO. 1 ENGINE WHICH RESULTED IN ITS UNCOMMANDED SHUT DOWN. BOTH ENGINES HAD A LENGTHY HISTORY OF CHIP ALARMS. LYCOMING HAD RECENTLY APPROVED A 100 HR. EXTENSION TO THE RECOMMENDED HOT SECTION INTERVAL AFTER A REVIEW OF MAINT. RECORDS. THREE SCAVENGE CHIP ALARMS OCCURRED DRG THE 50 HRS PRIOR TO THE FAILURE.

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

ENGINE ASSEMBLY,BEARING..FAILURE,TOTAL

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

TURBOSHAFT ENGINE..FOREIGN OBJECT DAMAGE

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

TURBOSHAFT ENGINE,FREE(POWER) TURBINE..BURST


Contributing Factors

FUEL SYSTEM,LINE..FOREIGN OBJECT DAMAGE

Index for May1985 | Index of months