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| Date: | Thursday 2 September 1993 |
| Time: | 13:03 LT |
| Type: |  McDonnell Douglas MD-82 |
| Owner/operator: | Trans Word Airlines (TWA) |
| Registration: | N918TW |
| MSN: | 49367/1197 |
| Year of manufacture: | 1985 |
| Engine model: | GE JT8D-209 |
| Fatalities: | Fatalities: 0 / Occupants: 108 |
| Other fatalities: | 0 |
| Aircraft damage: | None |
| Category: | Serious incident |
| Location: | St. Louis, MO -
 United States of America
|
| Phase: | Taxi |
| Nature: | Unknown |
| Departure airport: | New York, NY (KLGA) |
| (KSTL) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
AS THE CAPTAIN WAS TURNING THE AIRPLANE OFF THE RUNWAY FOLLOWING ITS LANDING ROLL HE SAID IT WAS '...EXTREMELY DIFFICULT TO TURN.' THE CAPTAIN SAID THE AIRPLANE TURNED TO A 45 DEGREE ANGLE TO THE RUNWAY AND WOULD GO NO FURTHER. THE STEERING SYSTEM FAILED AND THE CAPTAIN ATTEMPTED TO STOP THE AIRPLANE ON THE TAXIWAY USING BRAKES AND REVERSE THRUST. THE AIRPLANE WOULD NOT STOP AND ROLLED OFF ONTO THE GRASS AREA ADJACENT TO THE TAXIWAY. EXAMINATION OF THE BRAKE SYSTEM FOUND THE HYDRAULIC SYSTEM POWER TRANSFER UNIT'S (PTU) HOUSING WAS CRACKED AROUND ITS ENTIRE CIRCUMFERENCE. THE PTU ON THE INCIDENT AIRPLANE WAS AN EARLY STYLE UNIT ACCORDING TO THE MANUFACTURER'S SERVICE BULLETIN. THE SERVICE BULLETIN ADVISED OWNERS OF THE AIRPLANE TO REPLACE THE ORIGINAL ALUMINUM HOUSING WITH A CAST IRON TYPE. EXAMINATION OF THE PTU'S HOUSING FRACTURE SURFACES REVEALED SHRINKAGE CAVITIES, AND LARGE SILICON INCLUSIONS.
Probable Cause: a fatigue failure of the power transfer unit caused by a material defect which resulted in a total hydraulic system failure.
Accident investigation:
 |
|
Sources:
NTSB CHI93IA352
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 16-Mar-2024 17:46 | ASN Update Bot | Added |
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