Aviation Investigation Report A98H0003
4.3.9 Checklist Modifications
Checklists are designed by aircraft manufacturers and approved by regulatory authorities as part of the original evaluation and approval of aircraft-type design data. As airline operators decide to modify checklists to meet changing operational requirements, there is a need for modified checklists to follow the original design concepts contained in the AFM or other documents associated with the certificate of airworthiness.
In the absence of regulations requiring the approval of checklists that have been modified by airline operators, guidance material should be provided to operations inspectors. The guidance material, as a minimum, should contain methods of checklist design; checklist content; checklist format utilizing human factors principles; immediate action items; and sequencing of checklist items.
The Board is concerned that, given the lack of checklist modification and approval standardization within the aviation industry, airline operators may unknowingly introduce latent unsafe conditions, particularly to emergency checklists.
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