ASN Wikibase Occurrence # 368727
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| Date: | Wednesday 24 May 1989 |
| Time: | 09:05 LT |
| Type: |  Boeing 727-247 |
| Owner/operator: | Delta Air Lines |
| Registration: | N296WA |
| MSN: | 22533/1736 |
| Year of manufacture: | 1981 |
| Total airframe hrs: | 25391 hours |
| Engine model: | P&W JT8D-15 |
| Fatalities: | Fatalities: 0 / Occupants: 121 |
| Aircraft damage: | Minor |
| Category: | Serious incident |
| Location: | Denver, CO -
 United States of America
|
| Phase: | Pushback / towing |
| Nature: | Passenger - Scheduled |
| Departure airport: | Denver International Airport, CO (DEN/KDEN) |
| Atlanta Hartsfield-Jackson International Airport, GA (ATL/KATL) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
THE LEFT MAIN LANDING GEAR COLLAPSED AS THE AIRCRAFT WAS PULLED FORWARD SLIGHTLY TO BRING THE NOSEWHEEL OFF THE CHOCKS PRIOR TO PUSHBACK. INSPECTION DISCLOSED A FRACTURE OF THE FORWARD TRUNNION BEARING SUPPORT FITTING (P/N 65-16206-11) AND HEAVY SURFACE CORROSION. MICROSCOPIC EXAMINATION DISCLOSED EXTENSIVE INTERGRANULAR STRESS CORROSION, AND A CRACK THAT HAD DEVELOPED 0.1 INCHES INBOARD FROM THE FORWARD EDGE OF THE BORE, WHICH HAD PROPAGATED APPROXIMATELY 2.1 INCHES AFT INTO THE BORE SURFACE. THE FINAL FRACTURE RESULTED FROM DUCTILE SEPARATION.
Probable Cause: FAILURE OF THE LEFT MAIN LANDING GEAR FORWARD TRUNNION BEARING SUPPORT FITTING DUE TO A CRACK INITIATING AT THE FORWARD EDGE OF THE BORE AND PROPAGATING BY INTERGRANULAR STRESS CORROSION INTO THE BORE SURFACE THAT RESULTED IN AN EVENTUAL DUCTILE FRACTURE.
Accident investigation:
 |
|
Sources:
NTSB DEN89IA124
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 24-Mar-2024 06:50 | ASN Update Bot | Added |
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