ASN Wikibase Occurrence # 275136
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| Date: | Friday 4 February 2022 |
| Time: | 01:19 |
| Type: |  Boeing 737-8K2 (WL) |
| Owner/operator: | Sun Country Airlines |
| Registration: | N817SY |
| MSN: | 30392/833 |
| Year of manufacture: | 2001 |
| Total airframe hrs: | 68382 hours |
| Engine model: | CFM INTL. CFM56 SERIES |
| Fatalities: | Fatalities: 0 / Occupants: 56 |
| Aircraft damage: | Minor, written off |
| Category: | Incident |
| Location: | Las Vegas-Harry Reid International Airport (LAS/KLAS), NV -
 United States of America
|
| Phase: | Landing |
| Nature: | Passenger - Scheduled |
| Departure airport: | Las Vegas-Harry Reid International Airport, NV (LAS/KLAS) |
| Minneapolis-St. Paul International Airport, MN (MSP/KMSP) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
On February 4, 2022, about 0119 Pacific standard time (PST), Sun Country Airlines flight 110, a Boeing 737-8K2, N817SY, sustained minor damage when it suffered a right main landing gear (RMLG) collapse during landing at Harry Reid International Airport (LAS), Las Vegas, Nevada. The 50 passengers and 6 flight crew members were not injured. The airplane was operated as a Title 14 Code of Federal Regulations Part 121 scheduled domestic passenger flight.
Upon retracting the landing gear after takeoff, the flight crew received a right main landing gear (RMLG) red position indicator light, indicating that the RMLG was not in the up and locked position. The crew elected to return to the departure airport and the RMLG red indicator light remained illuminated until the crew selected the gear DOWN position for landing. During the landing roll, the RMLG collapsed, resulting in minor damage when the right engine impacted the runway. It is likely that the RMLG was partially fractured after takeoff which prevented it from retracting to the up and locked position.
Examination of the RMLG revealed that the outer cylinder fractured through a tooling hole. Examination of the fracture revealed the presence of fatigue cracking that initiated at the intersection of the tooling hole inner diameter and the outer cylinder inner diameter. Four areas of arc burn damage were identified in the tooling hole area, two of which were at the crack initiation sites. Cadmium identified at the intergranular separation initiation sites indicated the crack initiated due to liquid metal embrittlement by cadmium at the arc burn locations before propagating in fatigue.
The RMLG was last overhauled about 10 years before the incident, during which the outer cylinder was replated with cadmium after repair. It is likely that the arc burning in the tooling hole area was caused by a hand-held stylus cadmium plating operation performed in the tooling hole when the stylus (anode) made contact with the outer cylinder (cathode), initiating an arc. A nonconductive sleeve normally installed on the anode was either not present or deteriorated, allowing physical contact between the anode and cathode.
Probable Cause: The fatigue failure of the right main landing gear initiated by liquid metal embrittlement by cadmium at arc burn locations in the outer cylinder tooling hole area. The arc burns were likely the result of operator error during stylus cadmium plating operations during overhaul.
Accident investigation:
 |
|
Sources:
https://www.fox5vegas.com/news/local/plane-makes-hard-landing-at-las-vegas-airport-overnight/article_40cc9098-85ce-11ec-aaac-a7e3e053f4cb.html
NTSB
https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=817SY
https://flightaware.com/live/flight/N817SY
https://www.flightradar24.com/data/flights/sy110
https://globe.adsbexchange.com/?icao=ab2504&lat=35.966&lon=-115.008&zoom=11.0&showTrace=2022-02-04&leg=3×tamp=1643966357
Location
Media:
,@LASairport said the runway is still shut down because the airplane is still there, but officials are getting ready to move the plane.https://t.co/UgUdJW550E
— FOX5 Las Vegas (@FOX5Vegas) February 4, 2022
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 04-Feb-2022 14:56 | Captain Adam | Added |
| 04-Feb-2022 15:57 | harro | Updated [Aircraft type, Total occupants, Location, Source, Narrative] |
| 04-Feb-2022 15:58 | harro | Updated [Embed code] |
| 04-Feb-2022 16:18 | johnwg | Updated [Source, Embed code, Category] |
| 04-Feb-2022 17:34 | Goklerdeyiz.net | Updated [Source] |
| 05-Feb-2022 16:28 | harro | Updated [Embed code] |
| 10-Mar-2022 02:37 | Captain Adam | Updated [Source, Narrative, Category] |
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