As Per Our Current Ops.
1. No (Must be able to couple available navigation system to Autopilot and -400 will have only HDG/ALT functions available to A/P with dual FMC failure)
2. Only respective IRS info available to MAP (I stand to be corrected by anyone who knows better)
3. Updating is only available to the FMC not the IRS
4. CAT 3A ie. LWMO ops without requirement for autothrottle IS available with dual FMC failure
5. Depends where you're going... basic autopilot modes are available but no autopilot NAV coupling except for APR. No RNP available either so remove newspapers and plug in junior crew member to monitor TRK offset and HDG functions.
Hope that helps
