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In a far-reaching decision that affects over 100 engines, Superior Air Parts has confirmed that they are implementing a mandatory grounding/buy-back of all their XP-382 and XP-400 experimental aircraft engines. Bill Ross, A&P I/A and Superior Air Parts' VP Product Support explained that the company's decision to take all of the XP-382 and XP-400 engines out of the market comes after a lengthy evaluation and testing process. PS Engineering has introduced the latest variant of the PAC45, an FAA TSO’d special mission audio controller with MultiTalker, a 3-Dimensional sound placement system to help pilots differentiate the various radios they monitor simultaneously. The result is