ASN Wikibase Occurrence # 170017
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Narrative:The helicopter made an uneventful approach and landing on the helideck of Wellhead Tower PC03. It was intended to embark ten passengers and some equipment. After nine passengers had boarded, the aircraft suddenly settled and adopted a nose high attitude. The engines were shut down and the passengers and crew disembarked.
|Owner/operator:||Falcon Aviation Services|
|Fatalities:||Fatalities: 0 / Occupants: 11|
|Aircraft damage:|| Substantial|
|Location:||PC03 Wellhead Tower Helideck, Zakum Field, UAE -
United Arab Emirates
|Nature:||Passenger - Non-Scheduled/charter/Air Taxi|
|Departure airport:||PN49 Helideck|
|Destination airport:||PC03 Wellhead Tower Helideck, Zakum Field, UAE|
|Investigating agency: ||GCAA UAE|
|Confidence Rating:|| Accident investigation report completed and information captured|
Subsequent examination of the aircraft by the crew showed that the undercarriage aft crosstube had failed due to fatigue ffrom repeated stress due to cyclic loading of the crosstube. The landing gear was certified under a Canadian STC.
The same Operator experienced another crosstube failure (D412-664-203), on another Bell 412, registration A6-FLZ, 12 days after the first crosstube failure.
Existing fatigue cracking of the cross tube was not discovered, prior to failure, by the specified visual inspection as the cracks were hidden underneath the layer of paint on the surface of the undercarriage aft crosstube.
Transport Canada issued an Airworthiness Directive for the crosstube (AD-CF-2012-14R1). The USA Federal Aviation Administration issued an Airworthiness Directive for the crosstube (Docket No. FAA-2013-0145; Directorate Identifier 2012-SW-059-AD; Amendment 39-17554; AD 2013-16-16), which adds a life limit of 10,000 landings to the crosstube and removes from service any crosstubes with more than 10,000 accumulated landings.
https://www.ntsb.gov/aviationquery/brief.aspx?ev_id=20131212X33627&key=1 http://www.gcaa.gov.ae/en/ePublication/admin/iradmin/Lists/Incidents%20Investigation%20Reports/Attachments/51/2011-2011%20-%20Final%20Report%20B412EP%20%20A6-FLV%20-%20Case%20No.%2007-2011%20Serious%20Incident.pdf http://aerossurance.com/helicopters/b412-cross-tube-failure/
| || |
|Investigating agency: ||GCAA UAE |
|Status: ||Investigation completed|
|Duration: ||7 years 1 month|
|Download report: || Final report|
||Updated [Location, Source]|
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