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Real World BBJ Aux Tank Question

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    Real World BBJ Aux Tank Question

    When it comes to the BBJ's aux tanks, how permanent are they? I mean, is it the type of install that requires the customer to decide on during aircraft assembly, or at a C or D check? Or is it something that maintenance crews can install prior to a long distance flight and then remove when not needed?


    They are technically modular, but that's it - technically. I've seen them pulled for heavy checks (C or D) but even though you could probably remove them in a couple hours, the paperwork is pretty significant and you have to have somewhere to store the tanks when they're removed. So in reality, they're not removed unless absolutely necessary. As it is, I think the tanks themselves don't weigh much more than 100 pounds each, so it's not like they're a huge detriment to operations anyway.
    Chris Trott


      Both the installation and removal of tanks (including change of tanks and arrangement) requires a Supplemental Type Certificate and thus FAA approval.

      The BBJ aux tanks are supplied by PATS (now doing business under ALOFT AeroArchitects).

      The associated FAA STCs belong to PATS.
      Leo Cal


        Originally posted by mikejones View Post
        When it comes to the BBJ's aux tanks, how permanent are they? I mean, is it the type of install that requires the customer to decide on during aircraft assembly, or at a C or D check? Or is it something that maintenance crews can install prior to a long distance flight and then remove when not needed?

        To add to this, the tanks are not installed in Renton at the final assembly line but in a facility in Delaware before the plane goes to the interior installation.
        [email protected] Pletsch

        Postnigs with typnig errors since 1984


          I assume that adding or removing equipment such as aux tanks would require an A&P to perform a new weight and balance procedure to update empty weight and GC moment arm, and the paperwork that does that.
          Dan Downs KCRP
          i7-10700K 32GB 3600MHz 2080Ti