The operator advised that a new fatigue risk management system (FRMS) was developed, consistent with the requirements of Civil Aviation Order 48.1 (Appendix 7). This process included a fatigue study and historic fatigue data analysis conducted by a FRMS subject matter expert. The operator’s FRMS was approved by the Civil Aviation Safety Authority (CASA) for a trial period that commenced on 23 February 2022. The operator’s new FRMS does not include the sleep reporting spreadsheet utilised at the time of the occurrence.
The FRMS utilises a system of tools to manage and measure fatigue, including:
- a sleep diary integrated in the operator’s Air Maestro system, that predicts the ‘Alert Time’ (based on relevant scientific data), with the flight duty period not allowed to exceed the calculated alert time
- individual sleep needs are accounted for using a procedure for estimating individual sleep needs (EISN)
- use of the Karolinska Sleepiness Scale (KSS), to measure the subjective level of sleepiness at particular times of the duty period and criteria established for continuation of any duty period
- consideration of the effects of travelling across time zones and the period for acclimatisation to the new time zone
- monthly FSAG (fatigue safety advisory group) meetings, operational audits, fatigue reports and surveys.