How would you access the GPS position if the FMC is INOP?
With the FMC inop the GPS can't update anything.
You'd be Alternate Nav and the magenta line on the ND is generated by the ADIRU isn't it? With all it's associated drift/errors.
On the A330 to fly an RNAV Approach you need at least 1 FM working.
( I know you said RNAV STAR.)
Just checked the B777 smart cockpit Navigation section 11.50.1 with regards to Alternate Nav:--
It says the CDU does not accept undefined waypoints or conditional waypoints. Complete departure and arrival proceedures cannot be created in the CDU or cross loaded from the FMC if they contain these waypoints.
Therefore cannot do an RNAV SID/STAR or Arrival without an FMC.
Last edited by ACMS; 26th Jan 2015 at 08:35.