Question 3 in Flowchart 1 of Appendix B:
"Are you the holder of the airplane models TC
, or do you have access to the most recent EZAP analysis performed on the zone(s) you are modifying, or all design and installation data that is necessary to answer all the questions that are asked while performing the EZAP analysis as described in appendix A of this AC?
The last part of the question implies imo. that (as it is quite often in reality) a DO
that is not the TC
or STC holder of that zone may not have (reliable) answers to all questions...?
Furthermore, the "invitation" to perform EWIS appears only if you answer YES to the above. If you answer NO, you are forwarded to page 3, which contains what seems to be an alternative (simplified) procedure for determination of required task and interval.
Or do you see it differently?
Obviously if you are a TC
-holder EZAP is a must by default, but seen from the point of view of a DO
or generally a third party maybe not?