The Flight Crew Operating Manual procedure for crew comparison of the calculated Vref40 speed, while designed to assist in identifying a data entry error, could be misinterpreted, thereby negating the effectiveness of the check.
Qantas Airways Ltd
16 November 2015
Qantas Airways Ltd. (Qantas) has advised that the Central Display Unit pre-flight procedure has been modified as follows. After the take-off data has been verified and compared by both flight crew, they are to check the ‘APPROACH REF’ page and verify the Vref40 speed.
Current issue status:
The action by Qantas provides an additional defence to address the risk associated with this safety issue.