Sikorsky S-58T N4247U
11 April 1989 · Milwaukee, Wisconsin, United States · Serious injuries
Summary
On 11 April 1989 at about 15:31 local time, a Sikorsky S-58T registered N4247U was involved in an accident near Milwaukee, Wisconsin, United States. One person was on board and one was seriously injured. The aircraft was substantially damaged. The NTSB has published a probable cause for this accident; it is quoted in full below.
The record
- Date
- at 15:31
- Classification
- Accident
- Location
- Milwaukee, Wisconsin, United States
- Coordinates
- 42.9802, -87.9002
- Aircraft
- Sikorsky S-58T
- Registration
- N4247U
- Category
- Helicopter
- Engines
- 2
- Operator
- Not recorded
- Operating rule
- Part 133: Rotorcraft Ext. Load
- Purpose of flight
- Other Work Use
- Phase of flight
- Not recorded
- Route
- Milwaukee → Unknown
- Aircraft damage
- Substantial
- Weather
- VMC
- Light
- Day
- NTSB number
- CHI89FA071
People
1 person was seriously injured.
| On board | Died | Serious | Minor | Uninjured |
|---|---|---|---|---|
| 1 | 0 | 1 | 0 | 0 |
Probable cause
DISCONNECT OF THE TAILROTOR DRIVE SHAFT COUPLING.
Quoted verbatim from the NTSB record. This site does not paraphrase or interpret it.
Read the full NTSB narrative
THE ACCIDENT HELICOPTER DESCENDED INTO SLOPING TERRAIN AND ROLLED OVER WHILE PERFORMING EXTERNAL LOAD OPERATIONS. THE HELICOPTER HAD JUST PICKED UP A LOAD AND WAS MOVING LATERALLY WHEN IT SUSTAINED A LOSS OF ANTI-TORQUE CONTROL AND THE FUSELAGE STARTED AN UNCOMMANDED AND UNCONTROLLED ROTATION TO THE RIGHT. THE PIC WAS ABLE TO JETTISON HIS EXTERNAL LOAD INTO A CLEAR AREA AND MOVE THE HELICOPTER AWAY FROM OBSTRUCTIONS BEFORE INITIATING AN OUT OF GROUND EFFECT HOVERING AUTOROTATION.
Quoted verbatim from the NTSB record.
Other Sikorsky S-58T accidents
| Date | Aircraft | Location | Operator | Outcome | Died |
|---|---|---|---|---|---|
| 8 Jul 1989 | Sikorsky S-58T | Susanville, California, United States | Aris Helicopters Ltd. | Minor injuries | - |
| 21 Feb 1994 | Sikorsky S-58T | Walnut Creek, California, United States | Air One, Inc | Fatal | 3 |
| 18 Jul 1997 | Sikorsky S-58T | Page, Arizona, United States | - | No injuries | - |
| 18 Jul 1980 | Sikorsky S-58T | Morgan City, Louisiana, United States | Chevron USA In | Fatal | 5 |
| 1 Jul 1980 | Sikorsky S-58T | Bangor, Maine, United States | Carson Helicop | Fatal | - |
| 11 Oct 1971 | Sikorsky S-58T | Anchorage, Alaska, United States | Anchorage Heli | Fatal | - |
Other accidents in this area
| Date | Aircraft | Location | Operator | Outcome | Died |
|---|---|---|---|---|---|
| 1 Aug 1989 | Lancair 235 | Fond du Lac, Wisconsin, United States | - | Fatal | 2 |
| 14 Aug 1989 | Bell 47G-2A-1 | Wisconsin Dells, Wisconsin, United States | - | Serious injuries | - |
| 17 Aug 1989 | Cessna 172P | Superior, Wisconsin, United States | - | Serious injuries | - |
| 14 Oct 1989 | Cessna 172M | Cedarburg, Wisconsin, United States | Nack, James W. | No injuries | - |
| 15 Jan 1989 | Cessna 150J | Osceola, Wisconsin, United States | LEE Rasmussen | No injuries | - |
| 12 Feb 1989 | Piper PA-28R-201 | Stevens Point, Wisconsin, United States | Plodzien, Thomas J. | No injuries | - |