Needing a Conditional Inspection (west coast)

A coin tap test is simply that.

Tap the composite material with a coin. If the noise you here is sharp and solid, so is the material.
If the sound is dull and hollow, the material is compromised in some way.

And yes, an Experimental aircraft needs an Annual Condition Inspection
which can be accomplished by any A&P mechanic, though you might like to
have one who is familiar with gliders and/or composite construction.Â* If
you built it yourself, and secured a Repairman Certificate from the FAA,
you can perform your own inspections and repairs on that aircraft only.

An Annual Inspection for a Standard Airworthiness aircraft must be
inspected by an A&P mechanic with Inspection Authorization.

JJDK737 is right on about the coin test.

On 3/28/2020 7:24 AM, wrote:
A coin tap test is simply that.

Tap the composite material with a coin. If the noise you here is sharp and solid, so is the material.
If the sound is dull and hollow, the material is compromised in some way.

--
Dan, 5J

Might give John Bentley a call in Bend, Oregon.
Still a 3 1/2 hour drive though.