Becoming an Approved Boeing Bonding Facility for all Aircraft

[johnpowers]

We have completed all the required test on our Autoclave per the Boeing requirements. We have manufactured contless test panels for metal peel test, honeycomb peel test, lap sheer test, ect. We are required to perform what is call an Embedment test in accordance with BMS8-30. This is an obsolete spec. BMS8-30 was replaced by BMS5-90. Both the BMS8-30 and the new BMS5-90 were the specs. on application and tests for applying and using Foam Adhesives. However, the new BMS5-90 does not state anything about an Embdement test. We are unable to obtain the old spec BMS8-30 becuase it has been cancelled and Boeing is not very helpful nor do we want to ask them to many questions, they might think we don't know what we are doing. But after 20 years in airframe structural repairs/overhauls and manufactuing composite type panels we have never heard of this type of test. Does any one have any information regarding an Embedment test or the old Boeing spec BMS8-30??? Here is what we are required to do:

Accomplish the embedment strength test at 80° F +/- 10° F called out in BMS 8-30 (it is known that this is an obsolete specification) , except use BMS 5-90, type IV per BAC 5514-590 cured at 250° F in lieu of BMS 8-30, type I adhesive and the minimum embedment strength is 1312 pounds for the BMS 5-90 adhesive. After the test the samples are to be cut in half and checked for voids to ensure they meet the requirements in BMS 5-90.

 

[materialsliz]

John, my company has determined we need BAC5514 qual now. Could you share where you got your core from for the peel test? Normally we can find BMS core at our distributors, but none of ours have any of the BMS4-4 Ty 4-40N. Our last stop is Hexcel but their min buys are crazy.

 

[darceneaux]

We too are trying to resolve this same issue with Embedment Tests. I as well searched the Boeing supplier site to locate the document, D33080-1.926, Machine and Process Tools but have been unable to find it. Does someone have the link to assist me in locating that document? In addition to that document I would also greatly appreciate any assistance in locating the specs for BAC5452 as well.


As always with best regards,


Dondi

 

[materialsliz]

Dondi, are you on Boeing's portal or just their general supplier website? You will need access to their Portal to search their specs for the D33080 doc.

 

[darceneaux]

No, I was not on Boeing's portal just in the general supplier site. Thanks for the update.

 

[darceneaux]

In regards to constructing the samples for the Embedment Test, does anyone know how or which way the aluminum is attached to the core? Is it possibly wrapped around the aluminum or is it stacked into the cells of the honeycomb core?

 

[SWComposites]

See the figure in the file posted above. It appears that a slot would be machined into the core block, then adhesive/potting is applied to the slot, then the aluminum bar is inserted, and the bond cured.

 

[materialsliz]

In case any are interested we were able to find BMS4-4 Ty 4-40 core from HEATCON® Composite Systems.