THE Australian Defence Force's grounded MRH-90 helicopters, including a number of Royal Australian Navy aircraft based at HMAS Albatross, are progressively resuming flying.
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The ADF's fleet of 47 MRH-90 helicopters have been grounded since mid-July after an Australian Army aircraft was forced to undertake a precautionary landing due to a tail rotor vibration.
The aircraft had been en route to Brisbane Airport on July 11 when the vibration was detected with the aircraft captain aborting the mission and returning to HMAS Adelaide for a precautionary landing.
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Defence said the full circumstances that led to the precautionary landing were under investigation and grounded all its MRH-90 aircraft pending further technical investigation and advice.
Defence says the MRH-90 fleet will progressively resume flying from the week after a minor modification.
"The aircraft will be back in the air from Monday, August 19, after a minor modification is made to address the issue identified during the investigation," a defence spokesperson said.
A number of MRH-90s helicopters are embarked on various RAN ships, while the aircraft's home squadron is 808 at the Nowra based Fleet Air Arm station.
Australia has spent $3.5 billion on 47 new MRH-90s - a multi-role helicopter to be used by both navy and army, replacing the retired Sea King and ageing Black Hawk fleets.