Extra Flugzeugbau 300S N9K
24 March 1999 · Dow, Illinois, United States · No injuries
Summary
On 24 March 1999 at about 19:00 local time, a Extra Flugzeugbau 300S registered N9K was involved in an accident near Dow, Illinois, 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 19:00
- Classification
- Accident
- Location
- Dow, Illinois, United States
- Coordinates
- 38.9992, -90.3303
- Aircraft
- Extra Flugzeugbau 300S
- Registration
- N9K
- Category
- Airplane
- Engines
- 1
- Operator
- Not recorded
- Operating rule
- Part 91: General Aviation
- Purpose of flight
- Business
- Phase of flight
- Not recorded
- Route
- Dow → Unknown
- Aircraft damage
- Substantial
- Weather
- VMC
- Light
- Day
- NTSB number
- CHI99FA120
People
Nobody was injured.
| On board | Died | Serious | Minor | Uninjured |
|---|---|---|---|---|
| 1 | 0 | 0 | 0 | 1 |
Probable cause
a fatigue failure of the upper left longeron and adjacent diagonal cross member near the horizontal stabilizer attach point. A factor related to the accident was that the manufacturer informed the operator that they were already in compliance with the latest revision of a service bulletin because they had complied with a previous revision.
Quoted verbatim from the NTSB record. This site does not paraphrase or interpret it.
Read the full NTSB narrative
The pilot reported hearing a 'bang' as he initiated a left roll at the beginning of an airshow routine practice flight. The pilot landed the airplane uneventfully. Inspection revealed that the upper left longeron and a diagonal cross member in the empennage had failed. Metallurgical examination of the failed components revealed they failed due to fatigue. The aircraft manufacturer (Extra) had issued 3 Service Bulletins 300-2-95, Revision 'A' 'B' and 'C' regarding cracks in this area. Revision 'A' called for inspections of the area. Cracks were found on N9K in 1997 and repairs were made in accordance with Extra instructions. Revision 'B' was then issued calling for the same repairs that the operator had already made if cracks were found. When Revision 'C' was issued it called for the same type of repair, but the gusset to be used was shaped differently and was larger. The operator was told by Extra that if they were in compliance with Revision 'B' they were also considered to be in compliance with Revision 'C.'
Quoted verbatim from the NTSB record.
Other Extra Flugzeugbau 300 accidents
| Date | Aircraft | Location | Operator | Outcome | Died |
|---|---|---|---|---|---|
| 17 Jun 1992 | Extra Flugzeugbau 300 | Titusville, Florida, United States | Lillberg, John W. & Leslie J. | No injuries | - |
| 21 Mar 2006 | Extra Flugzeugbau 300S | Greenfield, California, United States | - | Fatal | 1 |
| 15 Mar 1992 | Extra Flugzeugbau 300 | Grant, Nebraska, United States | Thomsic, Michael F | Fatal | 2 |
Other accidents in this area
| Date | Aircraft | Location | Operator | Outcome | Died |
|---|---|---|---|---|---|
| 29 Aug 1999 | Benson SORRELL SNS-7 | Mt. Vernon, Illinois, United States | - | No injuries | - |
| 17 Jul 1999 | Piper PA-28-181 | Yorkville, Illinois, United States | - | Fatal | 2 |
| 18 Mar 1999 | Socata TB-9C | Cahokia, Illinois, United States | - | Serious injuries | - |
| 12 Jul 1999 | McMillan ZODIAC CH 601 HD | Nauvoo, Illinois, United States | - | Minor injuries | - |
| 22 Mar 1999 | Cessna 152 | Bloomington, Illinois, United States | - | Minor injuries | - |
| 25 Jan 1999 | Piper PA-46-350P | Rockford, Illinois, United States | Jerome S. Weiskopf | Serious injuries | - |