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    Senior Member Andy's Avatar
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    Dec 2019
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    Default PFD CB pulled in flight

    The FX-3 with Exec Glass panel powers the GDU 465 from Main Bus and IBBS. Either should be sufficient to keep the display fully operational.

    Today, in an inflight redundancy management test, I pulled the PFD circuit breaker. The GDU should have remained powered by IBBS and nothing should have changed. Instead the GDU shutdown and stayed shut down until the PFD circuit breaker was reset. This is not the expected system response. The AFCS kept AP engaged in LVL mode. The only other mode that was selectable was ALT.

    I plan to do more testing and will report what I find. My GDU powers fine on IBBS when on the ground so this does not appear to be a power wiring issue.
    Last edited by Andy; 10-07-2020 at 08:21 AM.

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