yourtcfg(at)aol.com
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 Posted: Mon Jun 09, 2008 7:41 pm Post subject: SB-90C THE STRAIGHT SKINNY!! |
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HELLO... First, in my earlier post I stated that it was not necessary to remove the center fuel tank to accomplish SB90C/D. That is true, Both SBs are to inspect only the FORWARD spar cap radius, at wing station 24:00. There is no radius on the back side of the spar, hence, no inspection. Quoting from SB90C, dated 5-30-1992 , page 1 "airplanes are being included in this SB for continuing inspection of the FRONT SPAR, LOWER CAP, FORWARD FLANGE at wing station 24:00. SB90C was to be accomplished within 50 flight hours of the issuance of AD 94-04-13, back in 1994. The first time either SB is done, it is required that the center fuel tank be removed (long bodied airframes only) to facilitate the installation of Commander service kit (90C-1,2,3 OR -4 by S/N) and modify the existing structure Again quoting from SB90C, page 6, part L, "Modify channel sections removed i n step (e), to facilitate later inspections". Once this kit is in place, and the modification complete, it is no longer necessary to remove any fuel tanks to do the required inspection as the above mentioned kits install a doubler with an access hole so the inspection can be performed. An important note. AD 94-03-13 still refers to SB 90C, not 90D. This is important in that the time requirements between inspections are those of 90C, not D. Also, while 90D does extend the time between inspections from 500hr to 750hr (normal use), a good thing, it adds an onerous calendar inspection requirement of 60 months (I am working from memory here so...) a bad thing. Should 90D be referenced in a revised AD, Most of us would be required to do this expensive and largely unnecessary inspection much more frequently. Any Commander that has been in continuous service since AD 94-04-13 was published certainl y would have the proper service kit installed and the modi fication complete and therefore would not require the fuel tank to be removed. jb
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