The company sent a mechanic to check on the situation.
There has been no word on what caused the leak.
No injuries have been reported.
UTC Public Relations released a statement on the leak, saying:
Earlier this afternoon, there was a natural gas leak at UTC Aerospace Systems’ Windsor Locks facility. The leak was quickly identified and employees in the impacted portion of the site were evacuated as a precaution. The leak has been repaired and the site has returned to normal operations.”