The Australian Transport Safety Bureau (ATSB) is investigating an unreliable airspeed and altitude indications involving a Boeing 737-476SF, registered ZK-TLJ, that occurred on a flight out of Perth Airport, Western Australia, on 10 June 2022.
During the cruise, the flight crew noted a discrepancy between the captain and first officer’s indicated altitude, indicated airspeed, and Mach number. After consulting maintenance watch, the flight crew elected to return to Perth Airport.
A final report will be released at the conclusion of the investigation. However, should a critical safety issue be identified during the course of the investigation, the ATSB will immediately notify relevant parties so appropriate safety action can be taken.