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miamiair

Sloping Longeron Change

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Hi miamiair,

I have seen it done quite often here at the Depot.

it takes a long time that's all.

Make template of the holes of the old one you get off the plane.

Good luck with rigging the ramp and door.

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Hello Bonzo,

How long does it usually take you guys...

This bird has both longerons needing replacement along with replacing both 737 terminal fittings.

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Why not just change the aft section from 737 back? Sounds like it might be easier!!!

Errr, no! Not really feasible.

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I have seen it done about half a dozen times by depot teams, the first time they spliced the longeron in, and yes it was a nitemare to rig the cargo door and ramp again. I have seen it take as long as couple weeks to two months.

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They briefed at the PIWG that they are using a milling machine from the F15 depot floor to drill holes in the new longeron after the machine measures the hole pattern on the old one. It was supposed to cut quite a bit of time off the entire job.

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Been part of the work crew once and seen it done several times. Most important thing is shoring

the empennage before removing anything. Once the item is removed, make a template of 1/4"

aluminium ..... job shouldn't take more than 2 - 3 weeks

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I'm an ex-C-130 sheetmetal mech turned planner at Robins. I have changed at least 12 of the sloping longerons. If you need more info, send me a PM and we can discuss this.

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Posted (edited)


Hi guy, just a question about this longeron, 
we have a broken tilted tang in our longeron that we have not any repair in according to our structural repair manual . But there are other repairs 
concerning in the other places of this longeron  such as a vertical tang and the angular part.
so can any one suggest a solution for this huge problem, thanks.

Edited by mecano flyer

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Actually we replace slopply longeron so I need some points which helps to change longeron.. 

On 3/9/2020 at 4:24 PM, Ahsan said:

Replacement procedure of slopply longeron I need 

 

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12 minutes ago, mecano flyer said:


Hi guy, just a question about this longeron, 
we have a broken tilted tang in our longeron that we have not any repair in according to our structural repair manual . But there are other repairs 
concerning in the other places of this longeron  such as a vertical tang and the angular part.
so can any one suggest a solution for this huge problem, thanks.

Actually we replace slopply longeron so I need some points which helps to change longeron

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I never saw a sloping longeron replaced at field level, only depot. It is not something that can be done with little or no knowledge.

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Seen it done in the field but work performed by depot/CLSS personnel.  Even then, somewhat tricky as field units are all equipped differently (machine shop/sheet metal tooling etc).

 

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I'm with tiny,  don't remember ever replacing one of these in the field.  Do remember replacing several in conjunction with PDM.  Additionally, there were a couple of aircraft discovered in the field with excessive corrosion requiring immediate replacement.  In these cases we submitted a 103 and subsequently flew the aircraft to WR for replacement.  

This is not a job for the faint of heart.  It is a heavy depot level task.  Further, it requires highly skilled technicians not normally (ever) found at the I level.  The shoring required is massive.  The aircraft must be completely hangered and once maintenance commences it cannot be moved.  Very precise alignment, measurement, drilling, fitting and much more required.  Additionally,  tooling most likely would be an issue.   Not saying doing the task in the unit can't be done but only it'd probably increase difficulty and take longer.

The bright side to all of this is WR has extensive experience doing this, dating back to 1972, perhaps earlier.  I think it could be said, no one does it better.  

Keep in mine what is written above is my best recollection of events that occurred almost 50 years ago.  Some or all of it may or may not be pertinent today.

 

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It wasn't that hard to do.  Shoring the airplane was the hardest part.  You need guys that are artists, not butchers to do the work.

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Glad it worked out for you. Your statement is why it isn't done at field level.

 

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