Bell 47G-5 N7925J
6 October 1996 · Nunda, South Dakota, United States · No injuries
Summary
On 6 October 1996 at about 13:00 local time, a Bell 47G-5 registered N7925J was involved in an accident near Nunda, South Dakota, United States. One person was on board and nobody was 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 13:00
- Classification
- Accident
- Location
- Nunda, South Dakota, United States
- Coordinates
- 44.1593, -97.0104
- Aircraft
- Bell 47G-5
- Registration
- N7925J
- Category
- Helicopter
- Engines
- 1
- Operator
- Not recorded
- Operating rule
- Part 137: Agricultural
- Purpose of flight
- Aerial Application
- Phase of flight
- Not recorded
- Route
- Flandreau → Unknown
- Aircraft damage
- Substantial
- Weather
- VMC
- Light
- Day
- NTSB number
- CHI97LA004
People
Nobody was injured.
| On board | Died | Serious | Minor | Uninjured |
|---|---|---|---|---|
| 1 | 0 | 0 | 0 | 1 |
Probable cause
failure of maintenance personnel to properly torque the six accessory drive bolts, which resulted in fatigue failure of the undertorqued bolts.
Quoted verbatim from the NTSB record. This site does not paraphrase or interpret it.
Read the full NTSB narrative
During the second agricultural load, a total loss of engine power occurred, and the pilot made an autorotative landing, but the helicopter was damaged during the occurrence. Examination of the engine revealed failure of six bolts that attached the accessory drive gear to the crankshaft. Further examination of the attachment bolts revealed that fatigue cracking had occurred. There was evidence that inadequate pre-load torque had been applied to the assembly. The engine had approximately 400 hours since its last overhaul.
Quoted verbatim from the NTSB record.
Other Bell 47 accidents
| Date | Aircraft | Location | Operator | Outcome | Died |
|---|---|---|---|---|---|
| 29 Oct 1996 | Bell 47G-3B-1 | Fillmore, Utah, United States | Usfs | Fatal | 1 |
| 7 Oct 1996 | Bell 47G-5A | King City, California, United States | - | No injuries | - |
| 10 Sep 1996 | Bell 47G-3B-1 | Rangely, Colorado, United States | - | No injuries | - |
| 11 Aug 1996 | Bell 47G-4A | Adel, Georgia, United States | - | Fatal | 1 |
| 29 Sep 1996 | Bell 47G-3B-1 | Borinquen | - | No injuries | - |
| 10 Dec 1996 | Bell 47G | Pendleton, Oregon, United States | Wildhorse Helicopters, Inc. | Fatal | 2 |
All 1,633 records for this type
Other accidents in this area
| Date | Aircraft | Location | Operator | Outcome | Died |
|---|---|---|---|---|---|
| 15 Aug 1996 | Beechcraft V35 | Custer, South Dakota, United States | - | Minor injuries | - |
| 5 Nov 1996 | Cessna 177B | Chancellor, South Dakota, United States | - | Fatal | 1 |
| 20 May 1996 | Air Tractor AT401 | Letcher, South Dakota, United States | - | No injuries | - |
| 8 Jun 1996 | Grumman American AA-1C | Custer, South Dakota, United States | - | Minor injuries | - |
| 4 Jul 1996 | Hewitt CASSUTT 3M | Vermillion, South Dakota, United States | - | Minor injuries | - |
| 13 Jul 1996 | Sauder AVID FLYER HH | Stoneville, South Dakota, United States | - | Minor injuries | - |