Air Tractor AT-502 N1022N
25 June 2011 · Lewistown, Montana, United States · No injuries
Summary
On 25 June 2011 at about 01:43 local time, a Air Tractor AT-502 registered N1022N, operated by SRB Aerial Applicators LLC, was involved in an accident near Lewistown, Montana, 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 01:43
- Classification
- Accident
- Location
- Lewistown, Montana, United States
- Coordinates
- 47.1725, -109.6714
- Aircraft
- Air Tractor AT-502
- Registration
- N1022N
- Category
- Airplane
- Engines
- 1
- Operator
- SRB Aerial Applicators LLC
- Operating rule
- Part 137: Agricultural
- Purpose of flight
- Aerial Application
- Phase of flight
- Not recorded
- Route
- Lewistown → Lewistown
- Aircraft damage
- Substantial
- Weather
- VMC
- Light
- Day
- NTSB number
- WPR11LA288
People
Nobody was injured.
| On board | Died | Serious | Minor | Uninjured |
|---|---|---|---|---|
| 1 | 0 | 0 | 0 | 1 |
Probable cause
The fatigue fracture and separation of the fuel bypass line, which resulted in a total loss of engine power.
Quoted verbatim from the NTSB record. This site does not paraphrase or interpret it.
Read the full NTSB narrative
The pilot reported that while in cruise flight about 800 feet above ground level, the engine lost power, and he initiated a forced landing to an area of open, uneven terrain. During the landing roll, the left wing struck the ground and the airplane ground looped. Postaccident examination revealed that the fuel bypass line was fractured and had separated from the fuel control unit. Metallurgical analysis revealed that the fuel bypass line fractured near a ferrule at the edge of the braze filler metal fillet. Striations on the fracture surface were consistent with a fatigue crack originating on the outside surface of the tube and propagating toward the inside surface and circumferentially around the tube wall. No maintenance records for the airplane were recovered during the course of the investigation, and, therefore, the amount of time and maintenance history on the line was undetermined.
Quoted verbatim from the NTSB record.
Other Air Tractor AT-502 accidents
| Date | Aircraft | Location | Operator | Outcome | Died |
|---|---|---|---|---|---|
| 22 Jul 2011 | Air Tractor AT-502 | Fergus Falls, Minnesota, United States | Farmers Union Oil Company | No injuries | - |
| 21 Jun 2011 | Air Tractor AT-502 | Blackfoot, Idaho, United States | Vector Disease Control International | No injuries | - |
| 22 Sep 2012 | Air Tractor AT-502 | Firebaugh, California, United States | Thiel Air Care Inc | No injuries | - |
| 15 Jun 2012 | Air Tractor AT-502 | Ipswich, South Dakota, United States | Tri-County AG Service Inc | No injuries | - |
| 14 Aug 2012 | Air Tractor AT-502 | Hanley Falls, Minnesota, United States | Northstar Aerospray Inc | Minor injuries | - |
| 22 Aug 2009 | Air Tractor AT-502 | East Grand Forks, Minnesota, United States | Agrimax LLC | Minor injuries | - |
Other accidents in this area
| Date | Aircraft | Location | Operator | Outcome | Died |
|---|---|---|---|---|---|
| 21 Aug 2011 | Cessna A185F | Polson, Montana, United States | - | No injuries | - |
| 21 Jun 2011 | Air Tractor AT-301 | Hogeland, Montana, United States | - | Fatal | 1 |
| 22 Jul 2011 | Cessna 210-5(205) | Darby, Montana, United States | Finkle Richard G | Minor injuries | - |
| 23 Jun 2011 | Piper PA-36-285 | Havre, Montana, United States | Barlow Kirk A | No injuries | - |
| 19 Mar 2011 | Cessna T310R | Butte, Montana, United States | - | Fatal | 1 |
| 24 Jun 2011 | Air Tractor AT301 | Circle, Montana, United States | Harris Spraying Inc. | No injuries | - |