ASN Wikibase Occurrence # 360516
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| Date: | Thursday 5 May 1994 |
| Time: | 09:55 LT |
| Type: |  Douglas DC-9-32 |
| Owner/operator: | Northwest Airlines |
| Registration: | N986US |
| MSN: | 47480/607 |
| Year of manufacture: | 1970 |
| Total airframe hrs: | 54685 hours |
| Engine model: | P&W JT8D-15 |
| Fatalities: | Fatalities: 0 / Occupants: 69 |
| Aircraft damage: | Minor |
| Category: | Serious incident |
| Location: | Memphis, TN -
 United States of America
|
| Phase: | Take off |
| Nature: | Unknown |
| Departure airport: | |
| Phoenix, AZ (KPHX) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
DURING TAKEOFF, AN UNCONTAINED FAILURE OF THE LEFT ENGINE OCCURRED. AN EXAMINATION REVEALED A FATIGUE FRACTURE THROUGH A REAR FLANGE BOLT HOLE OF THE COMBUSTION CHAMBER OUTER CASE, AT THE THREE O'CLOCK POSITION OF THE ENGINE. THE ENGINE HAD BEEN INSPECTED IN ACCORDANCE WITH AN APPLICABLE AIRWORTHINESS DIRECTIVE; HOWEVER, THE FRACTURE OCCURRED 2,060 CYCLES PRIOR TO THE NEXT SCHEDULED INSPECTION. ADDITIONAL INSPECTION REQUIREMENTS RESULTED FROM THE EXAMINATIONS OF THE ENGINE AND THE FRACTURE.
Probable Cause: THE FATIGUE FRACTURE OF THE COMBUSTION CHAMBER OUTER CASE. A FACTOR WAS THE MANUFACTURER'S INADEQUATE INSPECTION CRITERIA.
Accident investigation:
 |
|
Sources:
NTSB ATL94IA097
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 16-Mar-2024 08:09 | ASN Update Bot | Added |
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