ASN Wikibase Occurrence # 352964
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 23 July 1999 |
| Time: | 15:00 LT |
| Type: |  Air Tractor AT-301 |
| Owner/operator: | Ward Air Service Inc. |
| Registration: | N2368R |
| MSN: | 301-0418 |
| Year of manufacture: | 1981 |
| Total airframe hrs: | 6500 hours |
| Engine model: | P&W R-1340 |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Drew, MS -
 United States of America
|
| Phase: | Take off |
| Nature: | Agricultural |
| Departure airport: | (M37) |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The flight was departing from a 3,000 foot runway with a full load of fertilizer. The airplane became airborne, and according to the pilot, the engine lost power. The pilot was not able to maintain altitude, and the airplane impacted the ground about 2,500 feet from the departure end of the runway. The on scene investigation revealed that the No. 4 cylinder exhaust rocker box cover was fractured and missing, and appeared to not have been caused by impact with the ground. The No. 4 cylinder was removed from the engine and sent to the NTSB Materials Laboratory in Washington, D.C., for examination. The laboratory examination revealed that the No. 4 cylinder head had failed from fatigue cracking, probably the result of both mechanical and thermal stresses. It was likely that the fatigue originated first at the corners of the exhaust rocker shaft hole in boss '1', then initiated at localized casting defects in boss '2' as the fatigue in boss '1' grew and the local stresses increased in the remaining structure.
Probable Cause: a loss of engine power due to the failure of cylinder No. 4 boss, which was caused by fatigue cracking, resulting in a forced landing in marshy terrain and subsequent nose over.
Accident investigation:
 |
|
Sources:
NTSB MIA99LA203
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 09-Mar-2024 08:44 | 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