Re: IFR No Gyro/HSI question
The POH is good only for things like the basic airframe and powerplant, but when you start installing optional or third-party avionics, you really need to research the specific unit.
Lets put it this way. There is pretty much one Cessna 152 POH that hasn't been revised since the 1960's. I do a revision on my MD-88/90 PRM (Pilots Reference Manual -- airline equivalent of a POH) about every 60 days.
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