Accident RotorWay Exec 90 N89678,
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ASN Wikibase Occurrence # 299404
 
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Date:Tuesday 4 January 2000
Time:14:00 LT
Type:Silhouette image of generic EXEC model; specific model in this crash may look slightly different    
RotorWay Exec 90
Owner/operator:Cobb International
Registration: N89678
MSN: RI5026
Fatalities:Fatalities: 0 / Occupants: 2
Aircraft damage: Substantial
Category:Accident
Location:CHANDLER, Arizona -   United States of America
Phase: Unknown
Nature:Training
Departure airport:CHANDLER, AZ (P19)
Destination airport:
Investigating agency: NTSB
Confidence Rating: Accident investigation report completed and information captured
Narrative:
The flight was a familiarization for the private pilot, who was transitioning into this model of helicopter. An approach was being made to runway 03 when the instructor heard a loud bang from the engine compartment behind his back at an altitude of 100 feet. He stated that it felt like all engine power was lost. When the instructor saw the rotor rpm decreasing, he took control and initiated an autorotation to a soft sandy area. During the touchdown, the main rotor blades contacted the tail boom, and the tail rotor blades contacted the ground. The operator reported that a subsequent inspection determined that the secondary drive shaft fractured. Laboratory examination concluded that the shaft failed from fatigue, originating from galling sites introduced during the manufacturing process. The operator reported that a temperature strip on the bearing was noted to be darkened before the flight, but they were unsure if this information was determined independantly by either the CFI or the student. All other shafts in the operator's fleet were inspected and no additional suspect shafts were found.

Probable Cause: the fatigue fracture and separation of the secondary drive shaft, which resulted from the manufacturer's inadequate quality control process.

Accident investigation:
cover
  
Investigating agency: NTSB
Report number: 
Status: Investigation completed
Duration: 3 years and 10 months
Download report: Final report

Sources:

NTSB LAX00LA071

Revision history:

Date/timeContributorUpdates
16-Oct-2022 06:16 ASN Update Bot Added

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