FM/FG A320
Hello everyone,
Is it possible to lose the flight management portion of the FMGS without the flight guidance portion? In other words, FCU/AP/FD/AT still working but Flight management portion inop.. I am quite certain this is possible as when one activates nav backup on one MCDU, the other side can remain coupled with the same side AP. So my question is: what has to go wrong in the FMGS for the flight management portion to be lost whereas the FG portion still works? Thanks a lot in advance. |
Ok I sort of answered some of my questions but still have a few.
in case of dual latch, we are directed to Select the NAV B/UP prompt on both MCDU DATA pages. (Refer to DSC-22_20-60-130 General HOW TO USE, concerning navigation backup operation) During Dual latch: -22_20-90-10 1) Both FMGCs are inoperative. FM and FG capability are lost. 2) AP/FD, A/THR are lost When referring to 22-2-60-130, one can see this caution note :The MCDU NAV B/UP is to be used only in case of FM 1 + 2 failure. It can be selected temporarily in case of FM1 or 2 only failure, in order to ensure that the function is available on the failed side. When in MCDU NAV B/UP on both sides, one FG at least must be available to engage AP and A/THR. So, section -22_20-90-10 tells us that both FMGC's are lost including FG. Yet, 22-2-60-130 tells us at least one FG must be available to engage AP and AT I am confused. |
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