ASN Wikibase Occurrence # 359480
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| Date: | Sunday 18 December 1994 |
| Time: | 16:29 LT |
| Type: |  Boeing 747-131 |
| Owner/operator: | Trans Word Airlines (TWA) |
| Registration: | N53116 |
| MSN: | 20321/102 |
| Year of manufacture: | 1970 |
| Total airframe hrs: | 17982 hours |
| Engine model: | P&W JT9D-7A |
| Fatalities: | Fatalities: 0 / Occupants: 189 |
| Aircraft damage: | Minor |
| Category: | Serious incident |
| Location: | New York-John F. Kennedy International Airport, NY (JFK) -
 United States of America
|
| Phase: | Landing |
| Nature: | Unknown |
| Departure airport: | San Juan, PR (KSJU) |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
DURING LANDING ROLL, THE LEFT MAIN GEAR OUTER CYLINDER SEPARATED. METALLURGICAL EXAMINATION REVEALED A PRE-EXISTING FATIGUE CRACK IN THE SCHRADER VALVE HOLE. THE HOLE, INCLUDING THE FATIGUE REGION, CONTAINED A LAYER OF NICKEL APPLIED DURING OVERHAUL AS A MEANS OF RESTORING THE ORIGINAL TOLERANCES OF THE PART. THE CRACKING INITIATED FROM A 0.009-INCH-DEEP GOUGE OR FILING MARK IN THE NICKEL LAYER. BECAUSE OF THE PRESENCE OF THIS AND SIMILAR NEARBY MARKS, THE CORNER FAILED TO COMPLY WITH THE OVERHAUL REQUIREMENT OF A RADIUS PF 0.6 TO 0.9 INCH AT THE FATIGUE INITIATION LOCATION. ALSO, A BEVEL FOUND IN THE NICKEL LAYER AT THIS CORNER, DID NOT COMPLY WITH THE CORNER REQUIREMENT. THE CYLINDER HAD 82,131 HOURS OF TOTAL TIME AND 14,951 CYCLES, AND WAS LAST OVERHAULED AND RETURNED TO SERVICE SEPTEMBER 30, 1988. ALSO, GOUGES, AND FILING MARKS WERE DETERMINED TO BE THE SOURCE OF THE CRACK.
Probable Cause: Improper maintenance overhaul which resulted in a fatigue crack.
Accident investigation:
 |
|
Sources:
NTSB NYC95IA043
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 15-Mar-2024 11:21 | ASN Update Bot | Added |
Corrections or additions? ... Edit this accident description
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