The FAA has released a new draft Advisory Circular that is intended to describe acceptable statistical methods for developing substantiating data for comparative test and analysis compliance findings to support FAA approval of turbine engine and APU parts produced under a PMA, TC, STC, repair or alteration.
Several members have brought this AC to our attention and expressed their concerns about the details of this guidance. We welcome specific comments from members about problems and/or ways to improve this document. Based on member comments we have received so far, the proposed guidance appears likely to discourage applications to produce replacement parts. One reason for this is the large suggested sample size, and associated high costs, necessary to satisfy the proposed statistical analysis metrics. Continue reading
The FAA has released a draft advisory circular (AC) that is meant to provide guidance and describe acceptable methods for demonstrating compliance with the engine control systems requirements of 14 C.F.R. 33.28. It is intended for those manufacturing or modifying electronic engine control systems (EECS).
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