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| Date: | Tuesday 5 October 1999 |
| Time: | 05:40 LT |
| Type: |  McDonnell Douglas MD-11F |
| Owner/operator: | Fedex |
| Registration: | N606FE |
| MSN: | 48602/549 |
| Year of manufacture: | 1993 |
| Total airframe hrs: | 22055 hours |
| Engine model: | GE CF6-80C2 |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial, repaired |
| Category: | Accident |
| Location: | Newark International Airport, NJ (EWR/KEWR) [N] -
 United States of America
|
| Phase: | Landing |
| Nature: | Cargo |
| Departure airport: | Indianapolis, IN (KIND) |
| Newark International Airport, NJ (EWR/KEWR) [N] | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
During the landing roll, the center landing gear (CLG) on the MD-11 failed in a rearward direction. The lugs on the upper attach point of the lower drag brace on the CLG failed, the landing gear retraction cylinder was pulled apart, and hydraulic fluid was lost in the #3 hydraulic system. Metallurgical examination of the failed lug found evidence of overload. The DFDR recorded a momentary peak in vertical and longitudinal accelerations, about 5.75 seconds after main landing gear touchdown, and 2.5 seconds after nose wheel touchdown. The vertical acceleration momentarily reduced, and the longitudinal acceleration momentarily increased. According to McDonnell-Douglas, the CLG was capable of entering a divergent, longitudinal oscillation, which could fail the lower drag brace lugs. There were five prior documented events that were identical. After the first three events, McDonnell-Douglas duplicated it twice again, using instrumented airplanes. They subsequently issued a service bulletin for modifications to the CLG brakes and anti-skid system. The accident airplane had these modifications. Additional testing by the operator to determine the loads on the CLG during landing did not find any high loads, and the cause of the CLG oscillation was not determined.
Probable Cause: A divergent, longitudinal oscillation of undetermined origin on the center landing gear, which caused a failure of the center landing gear lower drag brace during landing roll.
Accident investigation:
 |
|
Sources:
NTSB NYC00LA005
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 07-Mar-2024 16:46 | ASN Update Bot | Added |
| 07-Mar-2024 16:50 | ASN | Updated [Aircraft type, Cn, Location, Nature, Destination airport, Narrative] |
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