The CSR says "community perceptions of fatigue-related risk have changed". This has led authorities to over-emphasise hours of service (HOS) or allowable duty time, as a means of controlling fatigue risk, the CSR says. It says there is "an emerging consensus that HOS are an inappropriate hazard control mechanism". It found there is a common thread to factors predisposing to pilot-fatigue-caused accidents. "There are...identifiable segments common to all fatigue-related incidents. In the earliest levels of the error trajectory there are segments related to the provision of an adequate opportunity to sleep and appropriate utilisation of a sleep opportunity." Monitoring of these factors can enable potential fatigue risk to be recognised, says the CSR.

Source: Flight International