ASN Wikibase Occurrence # 355583
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| Date: | Wednesday 9 July 1997 |
| Time: | 08:40 LT |
| Type: |  Boeing 727-2B7 (Adv) (F) |
| Owner/operator: | American Trans Air |
| Registration: | N770AT |
| MSN: | 21953/1516 |
| Total airframe hrs: | 52509 hours |
| Engine model: | P&W JT8D-17 |
| Fatalities: | Fatalities: 0 / Occupants: 11 |
| Aircraft damage: | Minor |
| Category: | Serious incident |
| Location: | Indianapolis, IN -
 United States of America
|
| Phase: | Standing |
| Nature: | Unknown |
| Departure airport: | (KIND) |
| Las Vegas, NV (KLAS) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
While the aircraft was being loaded with passengers, the flight engineer found that the right main landing gear had partially collapsed. The fractured right main landing gear had recently been overhauled and had accumulated 51 cycles and 126 hours since installation 21 days prior to the fracture. An examination was made of the aft portion of the upper and lower lugs of the trunnion. Chromium plating was apparent on sections of the trunnion where the overhaul manual stated that 'No Chrome' was to be applied. The spherical bearing assembly, locking bolt and anti-rotation washer were also examined. For normal assembly, the aft trunnion of the gear is inserted into the inner diameter of the wing mounted spherical bearing. The spherical bearing that contacted the trunnion journal had an inner diameter which measured approximately 3.50 inches. The aft trunnion journal of the failed landing gear had an outer diameter that measured approximately 3.25 inches. During landing gear replacement, the maintenance procedures require that the proper sized spherical bearings, either 3.50 inch or the 3.25 inch inner diameter, be matched with the appropriate outer cylinder aft trunnion outside diameter.
Probable Cause: the improper installation of the incorrect spherical bearing by the company's maintenance personnel. A factor was the improper plating of the trunnion with chromium by the landing gear overhaul facility.
Accident investigation:
 |
|
Sources:
NTSB CHI97IA205
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 12-Mar-2024 13:33 | ASN Update Bot | Added |
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