Given the input sentence, please extract the subject and object containing a certain relation in the sentence according to the following relation types, in the format of "relation1: word1, word2; relation2: word3, word4". Relations include: product/material produced; manufacturer; distributed by; industry; position held; original broadcaster; owned by; founded by; distribution format; headquarters location; stock exchange; currency; parent organization; chief executive officer; director/manager; owner of; operator; member of; employer; chairperson; platform; subsidiary; legal form; publisher; developer; brand; business division; location of formation; creator.

The suit, which seeks unspecified monetary damages, also alleges that the helicopter was designed and built by Airbus Helicopters, a unit of Airbus, with flaws to its tail rotor system which malfunctioned and made the aircraft "uncontrollable in the event of a failure, especially at low speeds, hover and/or liftoff."

Answer: product_or_material_produced: Airbus, aircraft