Commercial airlines are known for using highly reliable technology and highly-standardized operations which reduce uncertainty, variability and risks. The systems resulted from such reliability approach are effective to handle well-defined problems for both normal and abnormal operations. For the latter is expected that: pilots identify the problem; choose, read and understand the contents of the Quick Reference Handbooks (QRH) checklist, execute the steps; and evaluate the results . The rationale behind traditional QRH is that anomalies and emergencies can be addressed by using one checklist for each situation.