Forum: F-16 Procedures

Hi,

I being working on the F16 avionic and I cannot figure out this steps and purpose of it.

During some operational check like FCR, why the AOA had to be stop using a stopper? (I don't know if you guys encounter this step)

With or without doing this step I still can get my operational check done and without any abnormalities, therefore maybe someone can enlighten me?

Thanks

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It really depends on the ops check you are doing, with weight off wheels, the AOA probes must keep within a certain alignement to each other, once they get too far out from each other, the DFLCC assumes an error and goes to a predetermined "default"..

We used to have little weighted donuts that would hold the probes down... you could also just use the AOA probe covers pinned at the top and let the side rest on the probe for friction..

The best way to keep them together was to use a broom handle and wax string over both of the probes...

Smitty

thanks for the reply.

yeah, we using the dounut as well, but just like as we are doing FCR operational check on ground, without the dounut i believe the operational check should be still successful if not wrong? and i believe FCR operational check does not really affected by DFLCC. correct me if i am wrong?

thanks.

If you perform the test by the book, you can have confidence in the results. If you don't do the test by the book, you don't know if there is a problem with the aircraft or if there is a problem because you didn't do everything by the book. Is it that much trouble to follow the T.O. or to put the doughnuts on the AOA probes?

The purpose of putting the doughnuts on the AOA probes is to keep them within the correct alignment with each other. If they lose their alignment, the CADC will fail. If the CADC fails, you will not see the altitude on the MFD as you run the FCR antenna up and down. If part of the discrepancy that you are troubleshooting involves looking for altitude changes as the FCR antenna is moved up and back down, you will never see it. You can't verify that the CADC is talking to the FCR properly if you don't use the doughnuts. Maybe the CADC won't fail, maybe it will. If you use the doughnuts, it will work properly.

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Best Regards,

Forum: F-16 Procedures

AOA stopper for some operational check