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| Date: | Tuesday 8 April 1986 |
| Time: | 13:19 LT |
| Type: |  Boeing 737-222 |
| Owner/operator: | United Airlines |
| Registration: | N9054U |
| MSN: | 19935/138 |
| Year of manufacture: | 1969 |
| Total airframe hrs: | 32714 hours |
| Engine model: | P&W JT8D-9 |
| Fatalities: | Fatalities: 0 / Occupants: 114 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Chicago, IL -
 United States of America
|
| Phase: | Landing |
| Nature: | Passenger - Scheduled |
| Departure airport: | Omaha, NE (KOMA) |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
THE LEFT MAIN LANDING GEAR COLLAPSED MOMENTS AFTER TOUCHDOWN. WINDS AS REPORTED BY THE TWR WERE FROM 350 DEGS AT 19 KTS GUSTING TO 29 KTS. THE CAPTAIN AND COPILOT REPORTED THE TOUCHDOWN WAS NORMAL. THE 3 FLIGHT ATTENDANTS SAID THE AIRCRAFT LANDED HARD AND STARTED SHAKING VERY BADLY. THE FLIGHT ATTENDANTS ALSO REPORTED THAT THE PREVIOUS 2 LANDINGS HAD BROUGHT A GREAT DEAL OF VIBRATING/SHAKING TO THE AIRCRAFT. THE LEFT MAIN LANDING GEAR TEE BOLT WAS FOUND SEPARATED. METALLURGICAL EXAMINATION OF THE TEE BOLT SHOWED THE FRACTURE EMANATED FROM A SHALLOW PREEXISTING CRACK IN THE DRAG BRACE BEARING SURFACE RADIUS THAT THE METALLURGIST FOUND TO BE SHARPER THAN DESIRED. THE COLLAPSE OF THE LANDING GEAR IS CONSIDERED RELATED TO THE FRACTURED TEE BOLT. THE SAFETY BOARD IS UNABLE TO DETERMINE WHETHER OTHER EVENTS, CIRCUMSTANCES OR CONDITIONS WERE PRESENT THAT CONTRIBUTED TO THE TEE BOLT FAILURE IN THIS INSTANCE. THE OPERATOR HAS AMENDED THEIR REPAIR SPECIFICATIONS FOR THE TEE BOLTS.
Probable Cause:
Accident investigation:
 |
|
Sources:
NTSB CHI86FA119
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 28-Mar-2024 18:31 | ASN Update Bot | Added |
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