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Sta 597 Vert Beem replacement.


signman130
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This a/c is a nightmare. The problem now is the sta.597 vert. beem is corroded beyond limits and has to be changed. When we matched up the new beem to the old, the new is .130 narrower at the bottom than the old one.

this is causing a problem for edge distance for the fasteners.I believe we have the 7843161 reinforcement plate installed from and old repair.SRM 53-199-00 AG. Does the 597 beem require a reinforcement plate as the 517 does? All illustrations in the manuals do not show one being installed.

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  • 3 weeks later...

What is the serial number of this aircraft?

The 597 main frame has not changed much over the years like the 517 has. It also does not have a steel reinforcing plate like the 517 has.

The 597 frame is composed of two pieces, an inbd and outbd frame.

Compare the old on to the new one. It sounds like it may have been changed or modified before.

Be very aware where you attach the frame to the rear beam of the wing. follow the instl instructions, use of oversized fasteners and any NDT inspections called out.

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This a/c ,3925, has the -2 outer cap, although the IPC states it is a -4. After recieving the drawing, it seems the -2 outer cap was installed on 3915 thru 4083. The reenforcment plate were installed by the previous owners due to cracks in the outer caps. This was done sometime around 1979. We have the new inner and outer caps installed without and other discrepancies. This is the 5th beam we have replaced due to sever corrosion.

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The corrosin is mostly enviromental due to no preventive maint. We have repalced LH 517 and 528 beams, RH 517,528 and 597 beams, Lh flightdeck chine plate, RH aft chine plate in cargo area and MANY other repairs. the a/c is designed realy well to hold up to all the damage this one had.

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