ASN Wikibase Occurrence # 294523
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| Date: | Friday 10 September 2004 |
| Time: | 12:50 LT |
| Type: |  Hughes HU-369-D |
| Owner/operator: | Haverfield Aviation |
| Registration: | N5211R |
| MSN: | 1161D |
| Year of manufacture: | 1982 |
| Total airframe hrs: | 9984 hours |
| Engine model: | Allison 250-C20 B |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Waynesboro, Georgia -
 United States of America
|
| Phase: | Unknown |
| Nature: | Survey |
| Departure airport: | Augusta-Daniel Field, GA (DNL/KDNL) |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The flight was contracted by Georgia Power Company to complete inspections and maintenance on a number of their transmission power lines. After completing a shield wire splice procedure, both the pilot and passenger heard a "pop" in the rear of the helicopter. The helicopter began to spin "hard to the right". However, to avoid hitting the shield wire, the pilot increased the collective pitch, which accelerated the turn. After clearing the shield wire and making the second turn, the pilot reduced the throttle to slow the spin, leveled the helicopter and collided with trees in a level flight attitude. The pilot did not report any mechanical malfunctions with the helicopter prior to the accident. Examination of the helicopter revealed the main rotor blades separated, the left skid separated, the windshield broken, upward crush damage along the bottom of the fuselage aft of the skid, the tail rotor assembly separated at driveshaft, crush damage along the sides of the tail section and the horizontal stabilizer detached from the tail. The tail rotor assembly and part of the tail rotor drive shaft were sent to the NTSB Materials Laboratory in Washington D.C. for further examination. The Materials Lab determined that the tail rotor assembly failed due to a fatigue fracture of the input gearshaft in the tail rotor gearbox assembly. This fracture led to jamming of the gearbox and the resulting overstress fracture of the tail rotor drive shaft, which was consistent with the engine driving the shaft at the forward end with the aft end stopped.
Probable Cause: The tail rotor assembly failed due to a fatigue fracture of the input gearshaft in the tail rotor gearbox assembly, which resulted in a loss of tail rotor control and subsequent collision with trees.
Accident investigation:
 |
|
Sources:
NTSB ATL04LA181
History of this aircraft
Other occurrences involving this aircraft
| 1 April 1994 | N5211R | Chet Rasberry, Inc. | 0 | Rimrock, WA | |
sub |
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 11-Oct-2022 19:11 | ASN Update Bot | Added |
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