The regulation says "active controls", which is pretty broad. https://www.ecfr.gov/current/title-22/chapter-I/subchapter-M/part-121 https://www.ecfr.gov/curren

The regulation says "active controls", which is pretty broad. https://www.ecfr.gov/current/title-22/chapter-I/subchapter-M/part-121 https://www.ecfr.gov/current/title-22/chapter-I/subchapter-M...