In 2011 the Civil Aviation Safety Authority mandated that Australian Licenced Aircraft Maintenance Engineers (LAMEs) are required to be competent in human factors training. The underlying premise is that human factors training provides information and skills that may reduce the likelihood of human error, which has arguably been attributed towards the greatest percentage of aviation incidents and accidents. This study was a program evaluation utilising a modified version of the Kirkpatrick Evaluation Framework (Kirkpatrick, 1996). It investigated the human factors training received by Australian LAMEs to establish if the knowledge, skills and abilities acquired from their human factors training has been retained and also if it had been transferred to their aviation work environments. Specifically, the program evaluation investigated LAMEs’ impressions of their training program/s (e.g., their motivation and attention levels during participation), their level of knowledge and skills learned during the program, and the extent to which they use their acquired knowledge and skills in their work environment, post training. A number of other variables also investigated were the effectiveness of the training formats (face-to-face, online, blended learning, etc.), the effectiveness of the training assessment (examination, short answer, skills based, etc.), the impact of a training delay (recency of training), as well as the effect of experience (years service) on human factors knowledge retention and application in the workplace. Results will be discussed in relation to the effectiveness of current training methodologies and potential interventions for future training design.