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IRS and AP

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I think it's like this:You can navigate with only one IRU. It will get inputs from ADC 1 and 2 and can supply FMC 1 and 2, FCC 1 and FCC 2 and feed all 6 DEU's.For autopliot engagement you need:1 FCCRespective YD channelsRespective LSAS channels1 ADC1 radio altimeter2 IRUsRespective hydraulic systemTo go below CAT 1 single you need 2 IRUs in NAV for CAT 2 single and all 3 in NAV for CAT 3 dual land.Chris G

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