The engine issues both happened on Boeing 787 Dreamliner planes flying out of Auckland bound for worldwide destinations.
Both incidents involved the engines during climb on takeoff from Auckland, forcing them to turn back.
While New Zealand's national carrier did not disclose the cause of the issue, the New Zealand Transport Accident Investigation Commission said it was investigating two events involving "engine abnormalities".
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The commission say they're working closely with Air New Zealand, the Civil Aviation Authority and engine-manufacturer for Boeing Dreamliners Rolls Royce.
"Our investigation team is securing and reviewing aircraft records including recorder information, making preliminary examinations of the engines, and interviewing company representatives and the flight crew", Ms Meares said. "We finalised the schedule changes for Friday through to Sunday early [Thursday] afternoon and began the process of contacting customers".
Rolls-Royce has advised the carrier that some of the Trent 1000 engines in the airline's Boeing 787-9 fleet require maintenance sooner than previously indicated.
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In addition to this, the latest available information on any schedule changes will be published to the Travel Alerts section of the Air New Zealand website. Japanese airline ANA first reported issues with Trent 100s in the summer of 2016. The problem was thought to relate to blades in the turbine corroding far earlier than expected, resulting in the engines being shut down. From October 2018 the airlines will increase to three daily services operating a combination of A380, Boeing 777 and Dreamliner 787-9 aircraft. "This is the continuation of work which started a year ago to upgrade Trent 1000 engines to the latest standard".
Nick Judd, Air New Zealand's chief strategy, networks and alliances officer, Nick Judd, added that the extra flight would be "especially appealing to travellers to and from Europe, India and southeast Asia".
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