t56jeff Posted March 30, 2010 Share Posted March 30, 2010 has anyone changed slopinglongerons out at the same time both at once...and if so what tooling did you use and or direction....??? Quote Link to comment Share on other sites More sharing options...
tinyclark Posted March 30, 2010 Share Posted March 30, 2010 I'm no structures engineer, I'm just a pointy-head old RADAR tech. But, given the sloping longerons are the primary structure on the aft fuselage, and there aren't any beefy pieces up on the top section of the fuselage that come close to the longeron, I would have to utilize very few Risk Assessment principles and say not only no, but... There is nothing in the 130A-3 as a caution, but I seriously doubt an engineer would suggest that both can be done at the same time. 1 Quote Link to comment Share on other sites More sharing options...
pjvr99 Posted March 31, 2010 Share Posted March 31, 2010 Just make sure the aircraft is shored properly, and that the tail supports are in tight Quote Link to comment Share on other sites More sharing options...
Plaprad Posted March 31, 2010 Share Posted March 31, 2010 We do both at the same time here at Robins, they have the Aircraft shored and jacks in place. I's recommend calling WRALC to get the steps to do it though. I've never actually done it. Quote Link to comment Share on other sites More sharing options...
tinyclark Posted March 31, 2010 Share Posted March 31, 2010 OK, I am standing next to myself with faces on my eggs. Seems like it would be best to see what the depots actually do for shoring during this procedure. Quote Link to comment Share on other sites More sharing options...
tusker Posted March 31, 2010 Share Posted March 31, 2010 Better be safe than sorry!............................John Boy Quote Link to comment Share on other sites More sharing options...
Nc97 Posted March 31, 2010 Share Posted March 31, 2010 After discussing with some of the most experienced Sheetmetal Mechanics, including the Senior Sheetmetal Lead with 30+ years at WRALC, they say absolutely no way, no how. Quote Link to comment Share on other sites More sharing options...
tusker Posted March 31, 2010 Share Posted March 31, 2010 Good Day. I realize that a slope and longeron is a structural part of the aircraft but, could you show me a pic of it! Thank you so much!............John Boy Quote Link to comment Share on other sites More sharing options...
larry myers Posted March 31, 2010 Share Posted March 31, 2010 Would not sloping longeron replacement be considered depot level maintenance? This longeron, primarily the left one, has been problematic as long as I can remember. Many years ago it was a special emphasis item in the PDM work package. If units discovered a defective longeron on an acft. not going to PDM they submitted a depot maintenance assist. I believe the authority for this was contained in TO 00-25-107. Once the schedule was agreed the acft. would be flown to WR-ALC or one of the contractor depot facilities. I would be very reluctant to tackle this task at the I level primarly for lack of special tools, shoring, tech data, experience level and large MMHs required. While don't have access to applicable TOs, it appears from prevous threads tech data is still sketchy. Shoring, a great deal of it, required is by itself as major issue and requires precise placement. And, as the troops at WR have stated the last thing you want to do is attempt to replace both at the same time. Further, my guess it no one in the org. has experience at the task. On the other hand the troops at WR have been doing this for 35+ years. Quote Link to comment Share on other sites More sharing options...
tinyclark Posted March 31, 2010 Share Posted March 31, 2010 Here you go. Quote Link to comment Share on other sites More sharing options...
Plaprad Posted March 31, 2010 Share Posted March 31, 2010 My mistake. I thought they did do both at the same time. Meybe next time I'll pay more attention. Quote Link to comment Share on other sites More sharing options...
tusker Posted March 31, 2010 Share Posted March 31, 2010 thanks TinyClark!....Oh well!!....now let's see!!!!!!.....................John Boy Quote Link to comment Share on other sites More sharing options...
Dan Wilson Posted March 31, 2010 Share Posted March 31, 2010 I seem to remember having sloping longerons changed at home station a few times over the years. Dont remember if it was local guys or a WR team that did the repairs or not tho. Dan Quote Link to comment Share on other sites More sharing options...
larry myers Posted March 31, 2010 Share Posted March 31, 2010 I seem to remember having sloping longerons changed at home station a few times over the years. Dont remember if it was local guys or a WR team that did the repairs or not tho. Dan Dan, There are indeed situations where accomplishing depot level maintenance at home station does happen. For example, a Hays International depot repair team replaced the left wing on an AC-130A at Hurlbert damaged during fueling after fuel cell repair. It's very possible a similiar situation required longeron replacement at home station, especially if the longeron was damaged to the point the acft. was not flyable. Keeping in mind my perspective is TAC only acft., to the best of my feeble memory, although we replaced numerous left side longerons, don't recall doing any at home station. Acft. were repaired at one of three facilities; WR, Hayes International or Aero Corp. What surprises me is this structure is still a problem after almost 40 years. In my day replacement was driven primarily by corrosion. Caused in part by troops/crew dawgs with short stacks and low manifold pressure failing to taxi up close to the aft urinal. Is corrosion beneath the urinal the problem today? Regards, Myers Quote Link to comment Share on other sites More sharing options...
bischoffm Posted April 1, 2010 Share Posted April 1, 2010 YES, the urinal is still a big part of the problem in the ones without encapsulated latrines. They even put in one with a bigger opening in hopes they would not miss. I suggested the take the system out and make them sit down and pee. I guess it is not to MANLY. Also the jumpers may have issue, but the zipper suits are just to good to do it!! Quote Link to comment Share on other sites More sharing options...
Metalbasher Posted April 1, 2010 Share Posted April 1, 2010 It is still an issue but no where near the extent that it was in the day. Now the depot removes that skin panel FS 737-800 completely, removes all the paint, inspects, and then reassembles everything liberally using sprayable sealant and a gloss topcoat of paint (btoh as additional barriers to mitigate the corrosion). I kno wit doesn't sound like much but I can tell you that the normal corrosion issues I saw in the mid-late 80s are now rare to see as a result of new materials and processes. Given the circumstances surrounding this (directly below the urinal and mis-directed urine etc), I'm not sure that you will ever see an aircraft that has the gravitational drain type urinals without some corrosion...chalk it up as piss-poor design flaw. Quote Link to comment Share on other sites More sharing options...
larry myers Posted April 1, 2010 Share Posted April 1, 2010 (edited) Just had brain dump realizing Dan and I are talking about two different time frames. My frame of reference is late 60s to late 70s. Believe Dan's to be later. My experience is the longer an acft. is in the field the more capability wing maintenance acquires. Some previous depot maint. tasks become I level tasks. Process usually driven by shop chiefs who believe task is within their capability. ALCs usually not receptive to giving up such work and raise all kinds of stupid objections. When necessary we would play the money card. The difference between depot repair costs and I level costs was usually the winner. Edited April 1, 2010 by larry myers Wrote Dave. Meant to write Dan. Quote Link to comment Share on other sites More sharing options...
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