He could depress these bumps a little with his finger. He has removed each elevator and cut the glass and foam away along the top of each elevator, exposing the aluminum torque tubes. We have not seen this corrosion yet - he is sending us a sample of the affected tube. He says that this corrosion occurs only under the foam and glass. These is no corrosion at all on the exposed ends of the elevator torque tubes.
Pitch control is absolutely critical to safe flight.
For this reason, any report such as this must be taken seriously. A ll EZ, Defiant and Solitaire flyers should inspect the leading edges, the tops and the bottoms of both elevators for bumps such as we have described here, before next flight , If any evidence of bumps or corrosion is found, ground the airplane and remove foam and glass locally. Inspect the aluminum tubing under a bright light. Please report any problems found to RAF as soon as possible. Any builders who have not yet built the elevators should treat the aluminum tubing with Alodine before starting on the foam and glass elevators.