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ALL 135 ops specs require SIC. The caveat is that some allow you to use an autopilot IN LIEU OF an SIC.
Even then, the way I read it, as long as the pilot receives the SIC check ride and it is indicated on the form 8410 then they are legally an SIC.
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This is incorrect. Only 135 passenger carrying under IFR require an SIC if there is not an autopilot as stated in FARs 135.101 and 135.105. If you are carrying cargo, you do not need an SIC regardless if autopilot is installed or not.