Editing Robinson R44 (section)

===Rotor failures===
On 19 February 2015, the [[New Zealand Civil Aviation Authority]] issued an [[Airworthiness Directive]] grounding 80 of the country's R44 helicopters after two people were killed in an accident traced to a particular type of main rotor blade, the P/N C016-7 or Dash 7, which a preliminary investigation determined had failed in flight. It was the second failure or partial failure in two months. This was the largest-scale grounding of any aircraft in New Zealand's history. The CAA determined through laboratory tests that the rotor blade had failed due to overload during the crash and was not the cause of the accident and the fleet was ungrounded on 24 February 2015. The CAA left the Airworthiness Directive requiring repetitive inspections in place, however. Director of Civil Aviation Graeme Harris stated, "We don't want to see any complacency amongst operators as there is still a concern with these blades and we are waiting on test results from the USA before we review the Airworthiness notice."<ref name="stuff">{{cite news|last1=Kenny|first1=Katie|last2=Mann|first2=Brittany|title=Chopper ban after deaths unprecedented|url=http://www.stuff.co.nz/national/66485213/chopper-ban-after-deaths-unprecedented|access-date=21 February 2015|work=[[Stuff.co.nz]]|publisher=[[Fairfax New Zealand]]|date=21 February 2015}}</ref> Following the grounding in New Zealand, Australia's [[Civil Aviation Safety Authority]] (CASA) also grounded R44 helicopters with the same rotor blades.<ref name="R44-24">{{cite report|last=Ward|first=Nicholas|date=21 February 2015|title=Prohibition of Flight—C016-7 Main Rotor Blades|url=http://www.casa.gov.au/wcmswr/_assets/main/airworth/airwd/ADfiles/ROTOR/R44/R44-024.pdf|publisher=[[Civil Aviation Safety Authority]]|docket=AD/R44/24|access-date=23 February 2015|archive-url=https://web.archive.org/web/20150222162936/http://www.casa.gov.au/wcmswr/_assets/main/airworth/airwd/ADfiles/ROTOR/R44/R44-024.pdf|archive-date=22 February 2015}}</ref><ref name="ground">{{cite news|last1=Niles|first1=Russ|title=Australia, New Zealand Ground Some R-44s|url=https://www.avweb.com/avwebflash/news/Australia-New-Zealand-Ground-Some-R-44s-223598-1.html|access-date=23 February 2015|publisher=AVweb|date=21 February 2015}}</ref><ref name="CAA24Feb2015">{{cite press release|last=Richards|first=Mike|date=24 February 2015|title=CAA lifts flight ban on Helicopters|url=http://www.caa.govt.nz/public_and_media_info/caa_releases/med_rel_robinson_r44_2.pdf|publisher=[[Civil Aviation Authority of New Zealand]]|access-date=2 June 2015}}</ref>