Air New Zealand has been forced to ground some of its worldwide flights after revealing some of the Rolls-Royce engines mounted had to be inspected.
Air NZ says engine maker Rolls-Royce has advised that some of the Trent 1000 engines in the airline's Boeing 787-9 fleet require maintenance sooner than previously indicated.
"Rolls-Royce does not have any replacement engines available while this maintenance work is undertaken which means some schedule changes are unavoidable".
An Air New Zealand aircraft made an unscheduled landing last night after circling Tauranga and an area of ocean east of the Coromandel.
Transport Accident Investigation Commission (TAIC) chief commissioner Jane Meares said the commission has opened inquiries into both events.
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Passengers affected will be contacted, and the latest information will be published on the Travel Alerts section on Air New Zealand's website.
Said SIA's senior vice-president of marketing planning, Tan Kai Ping: "Our alliance with Air New Zealand has already benefited customers through more capacity, choice, improved connections and more codeshare destinations". A few weeks later Virgin Atlantic said it was had also experienced similar troubles with its Trent 1000 engines.
TAIC is working closely with the airline, Civil Aviation Authority and engine-manufacturer Rolls Royce.
"It's not uncommon for long-term engine programmes to experience technical issues during their life and we manage them through proactive maintenance", a Rolls-Royce spokeswoman was quoted as saying by Reuters. The investigation into that incident recommended that Rolls-Royce review the design of the intermediate pressure turbines.