Must do new Airframes fuselage items

skywagon8a said:

Thanks Steve, This answers the question: https://www.sherfab.com/assets/images/HETRON CR FR 992 TDS.pdf
Those of you who are using these components ought to include this documentation with your paperwork in order to back up your use to an FAA type who may raise the fire retardant question.
Randy is using the proper resin it's just not documented.

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mike mcs repair said:

As you install it in a plane covered in flammable dope.... sure...

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Steve Pierce said:

Here is what Randy at Carbon Concepts sent me on the fuel tank covers and the floorboards.

Tank lid construction

2. Mold is sprayed with AirDry at .5 per sqft.
3. 1 layer of carbon fiber 5.8 OZ is layed over mold.
4. 2 layers of 5HS 11 OZ carbon fiber is layed on all edges.
5. The four pieces of .25” core is placed on mol.d
6. 15” x 9” 5.8 Carbon fiber reinforcement is placed on mold.
7. Second layer of 5.8 Carbon fiber is placed over entire part
8. Vacuum process is performed with Hetron FR 992 Vinalester resin on layup until cured.
9. Part is demolded and trimmed.

Floor Board construction

2. Mold is sprayed with AirDry at .5 per sqft.
3. 1 layer of carbon fiber 5.8 OZ is layed over mold.
4. 1 layer of 5.8 oz E-glass is layed over mold
5. ¼” 4# PVC foam is layed over mold.
6. Second layer of 5.8 Carbon fiber is placed over entire part
7. Vacuum process is performed with Hetron FR 992 Vinalester resin on layup until cured.
8. Part is demolded and trimmed.

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skywagon8a said:

Do you know if Randy did any fire proof testing of the resins which he uses? That would be an approval issue. We had to add a third chemical to the resins which we used on the Twin Bee cowls in order to make them fireproof.

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