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Are the -01X versions of the VIR-30A/31A interchangeable with the -00X versions?

April 26, 2017versions vir-30a

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Are the -01X versions of the VIR-30A/31A interchangeable with the -00X versions?

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No, although the -01X versions incorporate a rotor modulation filter on the VOR instrumentation card for helicopter applications, the pin designation for the 27.5 DC Bus is different for the two versions. On the -01X versions, the 27.5 DC is assigned to Pin P1-41. On the -00X versions, the 27.5 DC is assigned to Pin P1-18.