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| Date: | Sunday 22 September 2002 |
| Time: | 17:52 LT |
| Type: |  McDonnell Douglas DC-9-32 |
| Owner/operator: | Northwest Airlines |
| Registration: | N941N |
| MSN: | 47450/535 |
| Year of manufacture: | 1970 |
| Total airframe hrs: | 62452 hours |
| Engine model: | Pratt & Whitney JT8D-15 |
| Fatalities: | Fatalities: 0 / Occupants: 85 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Minneapolis-St. Paul International Airport, MN (MSP/KMSP) -
 United States of America
|
| Phase: | Unknown |
| Nature: | Passenger - Scheduled |
| Departure airport: | Minneapolis-St. Paul International Airport, MN (MSP/KMSP) |
| Charlotte-Douglas Airport, NC (CLT/KCLT) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The airplane was damaged when the right main landing gear failed and collapsed during taxi for takeoff. A dark spot observed on the fracture surface showed a region with intergranular fracture features at the origin of the fracture with other areas of fatigue and intergranular fracture. Outside of the dark spot, the fracture features were consistent with overstress. Examination of the fractured landing gear revealed that small subsurface inclusions were present in the area near the fracture origin. Dissolved hydrogen content testing revealed hydrogen content ranging from 1 to 5 ppm. Residual stress tests show that the cylinder had compressive stress layers at the outer surface consistent with shot peening. The stress profiles showed maximum compressive stresses of 200 to 250 ksi transitioning to residual tensile stresses between 0.01 and 0.02 inch below the surface.
Probable Cause: The fatigue failure of the main landing gear strut due to inclusions in the material, residual stresses, and dissolved hydrogen content.
Accident investigation:
 |
|
Sources:
NTSB CHI02FA289
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 14-Oct-2022 08:28 | ASN Update Bot | Added |
Corrections or additions? ... Edit this accident description
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