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| Date: | Monday 3 June 2002 |
| Time: | 18:28 LT |
| Type: |  Douglas DC-9-31 |
| Owner/operator: | Northwest Airlines |
| Registration: | N8986E |
| MSN: | 47402/482 |
| Year of manufacture: | 1969 |
| Total airframe hrs: | 75241 hours |
| Engine model: | Pratt & Whitney JT8D-7B |
| Fatalities: | Fatalities: 0 / Occupants: 70 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Minneapolis, Minnesota -
 United States of America
|
| Phase: | Unknown |
| Nature: | Passenger - Scheduled |
| Departure airport: | Louisville-Muhammad Ali International Airport, KY (SDF/KSDF) |
| Minneapolis-St. Paul International Airport, MN (MSP/KMSP) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
During landing rollout the right main landing gear (RMLG) collasped. The captain reported a normal landing was completed by the first officer and when he took over control of the airplane "the aircraft dropped sharply to the right and we began skidding down the runway with a continous warning horn. I continued braking and the aircraft came to a stop on centerline with a significant right lean." According to the NTSB Materials Laboratory Factual Report, the outer cylinder of the RMLG was fractured through the transition area above the fused section, with the fracture located approximately 19 inches from the upper end of the cylinder. The factual report noted the fracture initiation point "lies in the parting plane for the cylinder forging. The dark spot [fracture initiation point] was orientated transverse to the gear about 28 7/8 inches from the lower end of the cylinder." According to the factual report, multiple inclusions and intergranular cracks were uncovered within the examined fracture sample. The inclusions were mostly oxides of aluminum and calcium and some inclusions contained small sulfides of iron and manganese. The report noted there were fracture features that were consistent with overstress separation "emanating from the dark spot [fracture initiation point] with mostly ductile dimple formations and some cleavage like features."
Probable Cause: The failure of the right main landing gear due to fatigue.
Accident investigation:
 |
|
Sources:
NTSB CHI02FA148
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 14-Oct-2022 15:45 | ASN Update Bot | Added |
Corrections or additions? ... Edit this accident description
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