ASN Wikibase Occurrence # 352309
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| Date: | Monday 6 December 1999 |
| Time: | 17:55 LT |
| Type: |  Boeing 767-232 |
| Owner/operator: | Delta Air Lines |
| Registration: | N111DN |
| MSN: | 22223/74 |
| Year of manufacture: | 1983 |
| Total airframe hrs: | 51977 hours |
| Engine model: | GE CF6-80A2 |
| Fatalities: | Fatalities: 0 / Occupants: 85 |
| Aircraft damage: | Minor, repaired |
| Category: | Serious incident |
| Location: | Salt Lake City, UT -
 United States of America
|
| Phase: | Initial climb |
| Nature: | Passenger - Scheduled |
| Departure airport: | Salt Lake City International Airport, UT (SLC/KSLC) |
| Dallas/Fort Worth International Airport, TX (DFW/KDFW) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The crew heard a loud noise and felt a vibration when the landing gear was retracted after takeoff. An emergency was declared, and the flight returned to Salt Lake City. When the landing gear was lowered, the nose and right main landing gear DOWN AND LOCKED lights illuminated, but a GEAR UNSAFE light illuminated for the left main landing gear. Following a low pass over the airport, maintenance personnel advised the landing gear appeared to be down and locked. An uneventful landing was made. Maintenance personnel informed the crew that the landing gear actuator had sheared and could not be pinned for towing. The part was later removed and examined. Stress corrosion cracking had occurred through 75% of the piston, followed by ductile separation. The corrosion had formed when a faulty fillet seal around the base of the rod end allowed moisture to enter the joint. The retract actuator was an original part, but it was determined that it had previously been reworked.
Probable Cause: Total failure of the main landing gear retract actuator due to stress corrosion caused by the use of a faulty sealant by company maintenance personnel that allowed moisture to enter the joint. A factor was the use of an improper fillet seal.
Accident investigation:
 |
|
Sources:
NTSB DEN00IA023
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 07-Mar-2024 08:00 | ASN Update Bot | Added |
| 07-Mar-2024 08:01 | ASN | Updated [Operator, Nature, Departure airport, Destination airport, Narrative] |
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