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GEN Control Offline

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    GEN Control Offline

    Just had this happen again on a startup for my 2nd leg in the 747-8F. In the linked forum post it was happening not only to myself but a real world 747-8 pilot. This was back in October. I have the latest version installed. No way to reset the generators unless you reload the aircraft. Same GEN's as the one in the link, 3 and 4.

    https://www.avsim.com/forums/topic/5...ctrical-issue/
    ​​​​​​
    Eric Fisher

    #2
    Maybe you had a generator failure?
    STEFAN ĐORĐEVIĆ

    Comment


      #3
      Originally posted by B777ER View Post
      Just had this happen again on a startup for my 2nd leg in the 747-8F. In the linked forum post it was happening not only to myself but a real world 747-8 pilot. This was back in October. I have the latest version installed. No way to reset the generators unless you reload the aircraft. Same GEN's as the one in the link, 3 and 4.

      https://www.avsim.com/forums/topic/5...ctrical-issue/
      ​​​​​​
      Bump your throttles a little, increase your N1. Too low of an idle, especially right after start, is insufficient for the constant speed drive in the IDG to operate. Once you disconnect an IDG by pushing the drive disconnect switch it cannot be rest by the flight crew. However, there is an item in the Ground Maintenance menus that allows the simulation to be reset without reloading.
      Dan Downs KCRP

      Comment


        #4
        Originally posted by DDowns View Post

        Bump your throttles a little, increase your N1. Too low of an idle, especially right after start, is insufficient for the constant speed drive in the IDG to operate. Once you disconnect an IDG by pushing the drive disconnect switch it cannot be rest by the flight crew. However, there is an item in the Ground Maintenance menus that allows the simulation to be reset without reloading.
        Copy, thanks
        Eric Fisher

        Comment


          #5
          Originally posted by DDowns View Post

          Bump your throttles a little, increase your N1. Too low of an idle, especially right after start, is insufficient for the constant speed drive in the IDG to operate. Once you disconnect an IDG by pushing the drive disconnect switch it cannot be rest by the flight crew. However, there is an item in the Ground Maintenance menus that allows the simulation to be reset without reloading.
          Yes, this does not work. I get consistent ELEC GEN OFF 3 and 4 messages every single time I do a second leg in the 747-8. Use of the Ground Maint feature to do what you describe helps reset it but I have to do it a couple times for it to stick. As soon as I land on the second leg, the ELEC GEN OFF 3 advisory caution pops on yet again. I don't get it? Is this a bug with the software or me?
          Eric Fisher

          Comment


            #6
            Originally posted by B777ER View Post
            Is this a bug with the software or me?
            I've personally never had it happen before. You don't by chance have a corrupt panel state, do you?
            Captain Kevin

            Kevin Yang

            Comment


              #7
              How would one know if it was corrupt? I have added nothing to since instinstall. If I delete it l, will it rebuild or does one have to uninstall the 747-8 and reinstall?
              Eric Fisher

              Comment


                #8
                The panel states won't rebuild, you'd have to re-create them yourself. In any event, to check, start with the default panel state with the engines running. Best to make sure you don't already have the airplane set to load a particular panel state. Try flying around then and see if your issue still persists. If the problem goes away, you have a corrupt panel state.
                Captain Kevin

                Kevin Yang

                Comment


                  #9
                  Interesting, I had a similar issue just yesterday. I closed the sim and looked at the saved panel state (I have autosave in FSUIPC turned on). I found this entry:

                  IDG XTM 1=8017.890625 8017.890625 -1.000000 0 0
                  IDG XTM 2=7085.664551 7085.664551 -1.000000 1 0
                  IDG XTM 3=4209.147949 4209.147949 -1.000000 1 0
                  IDG XTM 4=7961.933594 7961.933594 -1.000000 0 0

                  In the second to the last column you see 0, 1, 1, 0. The 1's just happen to coincide with the engines I had the issues on. I loaded the panel state and still had the generators not work. I shut down, went into the Failure menu (which showed 0 active) and went to electrical. I pressed perform maintenance and all was well again.

                  I'm guessing it's wear and tear. Not an actual failure. This is also just all a guess since I don't actually know what any of the numbers mean. I just thought it was coincidental that these were listed with the specific engines I had trouble with.
                  Ryan Gamurot

                  Comment


                    #10
                    I doubt that random idle speeds wont be enough to keep an IDG running...it would be a first from ANY turbine powered aircraft that I have seen. Otherwise, idle speed, especially after start, should reset them perfectly. If the -8 is anything like the automated stuff, there is a power source priority-for example in our aircraft its Onside, inside, outside, opposite side. So, in order-Eng 1, APU, Ext Pwr, Eng 2...it gets utilized according to system logic. Hence why you shouldn't have to really touch it after turning the engines.

                    Caveat-haven't look at the Boeing information for this yet, so I d be shocked if that were the case.
                    CA JP Walden
                    ATPMEL, IRA E170/190PIC, CE525 SIC
                    CFI/MEI/II

                    Comment


                      #11
                      I have this issue as well. I had two engine flameout, due to the auto tank/eng feature not working...restarted engines, could not recycle the GEN switches and bring both Generators on line. Additionally, at the gate trying to troubleshoot, while on APU power, started number 1 and when started the GEN1 tried picking up load from APU which caused flickering, then the entire SYNC bus lost power, and the number one engine flamed out. My understanding is with failure of the AC power system, the engines should not flameout as 1 igniter is powered off of STBY power and fuel should feed by the engine driven pump....

                      VR
                      Todd Hontz

                      Comment


                        #12
                        I had this issue with 744 on the third leg without closing the sim every time. I tried QRH procedures and tried to find the problem in Failure part in CDU and nothing can reset the fault.
                        Chi-cheng Liu (Volleyball)

                        Comment


                          #13
                          Originally posted by Volleyball View Post
                          I had this issue with 744 on the third leg without closing the sim every time. I tried QRH procedures and tried to find the problem in Failure part in CDU and nothing can reset the fault.
                          If you select Clear All faults and the fault persists then it is almost certainly a panel state problem. A new panel state should solve the problem.
                          Dan Downs KCRP

                          Comment


                            #14
                            Originally posted by DDowns View Post

                            If you select Clear All faults and the fault persists then it is almost certainly a panel state problem. A new panel state should solve the problem.
                            Thank you for the reply. But I’m not sure what you mean by “a new panel state should solve the problem.”

                            By my post, the third leg what I mean is, for example, TPE-MNL-HKG-TPE, the HKG-TPE leg. What I did in MNL and HKG was after engine shut down, I wait for the FMS to reset itself to preflight state, then start from a normal preflight procedure, and found the problem in HKG after I start my engines.

                            I didn’t load any panel states except the one I started from TPE. Do you mean I have to load a panel state again after my engine shut down in HKG? That means we have to re-load a panel state every 2 flights we done? Thanks for clarification.
                            Chi-cheng Liu (Volleyball)

                            Comment


                            • DDowns
                              DDowns commented
                              Editing a comment
                              Because you entered a thread that you didn't start, I confused your problem description with the original poster. Please start a new thread with a full problem description.
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