Accident Cessna 172S Skyhawk SP EI-DDX, Monday 6 January 2020
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Date:Monday 6 January 2020
Time:c. 11:40
Type:Silhouette image of generic C172 model; specific model in this crash may look slightly different    
Cessna 172S Skyhawk SP
Owner/operator:Atlantic Flight Training Academy
Registration: EI-DDX
MSN: 172S8313
Fatalities:Fatalities: 0 / Occupants: 2
Other fatalities:0
Aircraft damage: Minor
Location:Cork Airport (ORK/EICK) -   Ireland
Phase: Landing
Departure airport:Cork Airport (ORK/EICK)
Destination airport:Cork Airport (ORK/EICK)
Investigating agency: AAIU
Confidence Rating: Accident investigation report completed and information captured
During an instructional flight at Cork Airport (EICK), a section of the left main landing gear assembly departed the aircraft following a touch-and-go landing on Runway (RWY) 25. The Instructor, after discussions with Cork Air Traffic Control (ATC), performed a controlled two-wheel landing at EICK following which he steered the aircraft onto the grass verge to the left of the runway. There were no injuries reported. There was no fire.

Detailed metallurgical analysis of the undercarriage leg identified that the failure of the component was due to unapproved and improper weld repairs, which had been performed on its outer diameter. Aside from the unapproved nature of the weld repair, the welds were of very poor quality, and were most likely conducted in damp conditions, such that they compromised the structural integrity of the leg causing a degree of hydrogen embrittlement in the Heat Affected Zone. Consequently, as the material cooled down after the welding process, cracks would have occurred within the material structure. With continued operation of the aircraft, a fatigue crack initiated from the tip of a crack within the Heat Affected Zone and
propagated through the parent alloy material of the undercarriage during successive landing cycles. Eventually, the combined crack reached a critical length, which resulted in final separation of the leg during the touch-and-go landing.

Accident investigation:
Investigating agency: AAIU
Report number: 
Status: Investigation completed
Duration: 1 year and 5 months
Download report: Final report



Photo: AAIU


Revision history:

06-Jan-2020 20:32 Aerossurance Added
06-Jan-2020 22:11 Iceman 29 Updated [Embed code]
06-Jan-2020 23:17 Aerossurance Updated [Total occupants, Nature, Departure airport, Source, Embed code, Narrative]
05-May-2020 14:29 Newspaper Updated [Source, Embed code, Narrative, Photo]
22-Jun-2021 16:54 harro Updated [Location, Embed code, Narrative, Accident report, Photo]

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