Where can you find the maximum amount of cylinder fin area that can be removed to clean a damaged area?

• A. The engine overhaul manual.
• B. The airworthiness directive.
• C. The service bulletin.
• D. The manufacturer’s warranty.

Answer: (A)

The main idea is that the official limits for how much material you can remove during repair are found in the engine overhaul manual. For cylinder fins, removing a certain amount of fin area can affect cooling and structural integrity, so the manual specifies the maximum amount that may be removed and how to measure and document it. If the damage would require more removal than allowed, the part typically must be replaced rather than repaired. The other documents serve different purposes: an airworthiness directive addresses mandatory safety actions, a service bulletin offers recommendations or modifications from the manufacturer, and a warranty covers issues under warranty rather than repair limits.