Chaos on Qantas airlines continues with the fourth flight in 48 hours forced to do an emergency landing due to technical problems.A Melbourne-bound flight was turned back to Hobart Airport just 20 minutes after take off on Tuesday evening.A warning system in the cockpit indicated to the pilots that there was an issue with the aircraft.The aircraft was grounded for two hours while engineers at Hobart Airport investigated the Boeing 737, ensuring it was safe to take off again.The plane was approved for flight and passengers safely arrived in Melbourne just before 9pm (AEST).
