Australian flag-carrier Qantas has grounded five Bombardier Q400 turboprops over concerns centred on the type's main landing-gear.

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The decision follows "incidents" experienced by an overseas operator of Q400 aircraft, says the airline, although it has not identified the carrier involved.

"Our approach to this issue, which requires the replacement of a main landing-gear fitting component, is consistent with Qantas' proactive, conservative and safety-first approach to every part of its operations," says chief executive Alan Joyce.