When are inspection rings typically removed?

Inspection rings are typically removed when repairs are needed. These rings serve as structural connectors to ensure that the fabric covering is securely attached to the airframe. Their removal allows for thorough inspection of underlying areas for damage, wear, or other issues that may require attention.

During maintenance, particularly if there is a suspicion of damage under the fabric or if the fabric's integrity is questioned, gaining access to these areas is crucial. By removing the inspection rings, technicians can properly assess and address any necessary repairs, ensuring the overall safety and performance of the aircraft.

The other scenarios, while related to aircraft maintenance, do not align directly with the purpose of the inspection rings. For instance, they are not typically removed during the initial installation, as they are meant to remain in place to secure the fabric. They are also not routinely taken off before painting, which could happen after repairs are confirmed. Similarly, the removal of these rings is not specifically tied to the replacement of fabric; instead, it focuses on the need for integrity checks and repairs prior to any fabric replacement or other maintenance tasks.