It is the third incident in which a Tiger plane approached an airport below the minimum altitude, and the second incident involving the same pilot.
The Australian Transport Safety Bureau (ATSB) has released a preliminary report into the incident, saying an Airbus flew below the minimum height of 600 metres feet while approaching Avalon Airport.
An earlier investigation found a separate Tiger plane flew too low into Melbourne Airport after using a database containing the wrong descent altitude.
The breaches contributed to the airline's domestic fleet being grounded until August.
The pilots' union has confirmed the same pilot was involved in both cases, but the ATSB says the pilot was qualified to fly the aircraft and had 15,000 hours of flying experience.
The Civil Aviation Safety Authority has suspended Tiger Airway's flights until August, while it investigates safety problems with the airline.
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