Some people might not fly without an a/p but it can stop working anytime and I wouldn't cancel a trip for that reason alone. It is a great reliever on long trips and it can really help out when flying solo and have stuff to lookup, alternates to study, calls for WX and more.
Looking at this topic a different way, if I had all the major items working in my airplane and was wondering what I should work on next, the a/p and associated trim system would be high on the priority list if it didn't operate in a trustworthy fashion.
Paul Legacy RG I agree with Colyn. Long flight, heavy workload, no AP, fast, clean airplane=recipe for disaster if anything unexpected happens. Probably survivable most of the time.
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