Final answer:
In aviation, a statement for return to service is required when a repair station does a major repair and uses a maintenance release and FAA Form 337.
Step-by-step explanation:
In aviation, a repair station uses a maintenance release and FAA Form 337 for major repairs. A statement for return to service is required in this case. The statement for return to service confirms that the repair work has been completed in accordance with applicable regulations and that the aircraft is now airworthy.