Sikorsky S-58JT N1099T
13 February 1995 · Marblemount, Washington, United States · Serious injuries
Summary
On 13 February 1995 at about 18:20 local time, a Sikorsky S-58JT registered N1099T was involved in an accident near Marblemount, Washington, 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 18:20
- Classification
- Accident
- Location
- Marblemount, Washington, United States
- Coordinates
- 48.4406, -121.2693
- Aircraft
- Sikorsky S-58JT
- Registration
- N1099T
- 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
- Aircraft damage
- Substantial
- Weather
- VMC
- Light
- Day
- NTSB number
- SEA95LA051
People
1 person was seriously injured.
| On board | Died | Serious | Minor | Uninjured |
|---|---|---|---|---|
| 1 | 0 | 1 | 0 | 0 |
Probable cause
FATIGUE FAILURE OF THE MAIN ROTOR DRIVESHAFT.
Quoted verbatim from the NTSB record. This site does not paraphrase or interpret it.
Read the full NTSB narrative
THE MAIN ROTOR DRIVESHAFT FAILED DUE TO FATIGUE FAILURE WHILE THE PILOT WAS CONDUCTING HELICOPTER LOGGING OPERATIONS. THE MAIN ROTOR DRIVESHAFT HAD 952 HOURS SINCE NEW, AND HAD BEEN INSTALLED NEW AT THE MOST RECENT GEARBOX OVERHAUL. OVERHAUL PERIOD AND MAIN ROTOR DRIVESHAFT RETIREMENT TIME ARE 2500 HOURS. THE PILOT WAS NOT AT AN ALTITUDE OR AIRSPEED WHERE A SUCCESSFUL AUTOROTATION COULD BE ACCOMPLISHED.
Quoted verbatim from the NTSB record.
Other Sikorsky S-58JT accidents
| Date | Aircraft | Location | Operator | Outcome | Died |
|---|---|---|---|---|---|
| 22 Dec 2003 | Sikorsky S-58JT | Ypsilanti, Michigan, United States | - | Minor injuries | - |
| 1 Aug 2012 | Sikorsky S-58JT | Middletown, Delaware, United States | Aircrane Inc | No injuries | - |
| 10 Nov 2019 | Sikorsky S 58JT | Lebanon, Indiana, United States | Midwest Helicopter Airways, Inc. | Minor injuries | - |
Other accidents in this area
| Date | Aircraft | Location | Operator | Outcome | Died |
|---|---|---|---|---|---|
| 4 Jul 1995 | Hughes 369HS | Orting, Washington, United States | Helicopter Specialty | Serious injuries | - |
| 5 Jul 1995 | Cessna 182R | Copalis Beach, Washington, United States | - | No injuries | - |
| 6 Jul 1995 | Aero Commander S2R | Odessa, Washington, United States | Smith Air, Inc. | No injuries | - |
| 3 Jul 1995 | Champion 7GCBC | Moses Lake, Washington, United States | - | Minor injuries | - |
| 9 Jul 1995 | Wheeler KITFOX V | Silvana, Washington, United States | - | Fatal | 2 |
| 15 Jul 1995 | Piper PA-28-160 | Kent, Washington, United States | - | No injuries | - |