ASN Wikibase Occurrence # 353160
This information is added by users of ASN. Neither ASN nor the Flight Safety Foundation are responsible for the completeness or correctness of this information.
If you feel this information is incomplete or incorrect, you can submit corrected information.
| Date: | Friday 18 June 1999 |
| Time: | 07:50 LT |
| Type: |  PZL M-18A Dromader |
| Owner/operator: | Basile Flying Service, Inc. |
| Registration: | N7075D |
| MSN: | 1Z024-13 |
| Total airframe hrs: | 4842 hours |
| Engine model: | Pzl-Kalisz ASZ-621R-M18 |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Basile, LA -
 United States of America
|
| Phase: | Manoeuvring (airshow, firefighting, ag.ops.) |
| Nature: | Agricultural |
| Departure airport: | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot was applying a chemical to a field. After completing a pass, as he applied aft elevator for a straight-ahead pull-up, a loud 'boom' was heard, and the outboard section of the right wing separated. The airplane became 'uncontrollable' and impacted in an uncultivated field. Metallurgical examination revealed that the separation of the right wing forward spar lower attachment fitting was the result of fatigue cracking in the bracket lugs. The fatigue cracking initiated from areas of severe corrosion damage in the lugs. Evidence of extensive corrosion pitting was found in brackets from all other examined front spar attachment fittings, particularly on the internal surfaces of the lugs. The Service Manual and applicable service bulletins call for fluorescent penetrant or magnetic particle inspection of wing attachment fittings during the 3,000-hour inspection for extension of the airframe life to 6,000-hours. Although the aircraft records show that during the last annual inspection, which was completed approximately 596.5 hours prior to the accident, at an airframe time of 4,245.5 hours, all time life items were complied with, the metallurgical examination disclosed no trace of dye penetrant residue on any of the examined components.
Probable Cause: The separation of the right wing forward spar lower attachment fitting due to a fatigue fracture, which emanated from corrosion as a result of maintenance not being performed.
Accident investigation:
 |
|
Sources:
NTSB FTW99LA170
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 09-Mar-2024 11:02 | ASN Update Bot | Added |
Corrections or additions? ... Edit this accident description
The Aviation Safety Network is an exclusive service provided by:
Quick Links:
| ASN Home | Send Correction / Feedback |
| FSF Home | Disclaimer | Copyright |
| Contact Us | Privacy Policy |
| Press / Media |
CONNECT WITH US:
©2024 Flight Safety Foundation