The Australian Transport Safety Bureau (ATSB) is investigating a recent incident involving a Qantas Airways' Bombardier Dash 8 Q300 aircraft.
The turboprop, registration VH-SBG, was flying the Sydney-Wagga Wagga route on 29 July when smoke was detected in the cockpit. The flight was operated by Eastern Australia Airlines, which operates regional domestic services under the QantasLink banner.
"The pilot of the Dash 8 advised air traffic control of smoke in the cockpit when the aircraft was about 70km north-north-east of Canberra," says the ATSB.
A Qantas spokesman would only say that the smoke was "due to an electronic defect in the flight deck".
The aircraft was diverted and landed at Canberra airport at 12:45 local time. None of the 50 passengers and four crew on board were injured.
"The aircraft has returned to service after being assessed and repaired by our engineers yesterday," Qantas says.
Flightglobal's Ascend Online data shows that the airframe was built in 2001 and is owned by Qantas.
The ATSB says its investigation is expected to take around three months to complete.