Essential requirement:
Unless the engine is protected by a cover or its own enclosure, exposed moving or hot parts of the engine that could cause personal injury shall be effectively shielded.

Harmonized standard:
• No standard is envisioned.

Note: The principle being that if you can ‘walk into’ an engine compartment then exposed moving or hot parts should be protected. An engine box or under cockpit floor space would be deemed to be a cover.