This document has been declared "Stabilized" and will no longer be subjected to periodic reviews for currency. Users are responsible for verifying references and continued suitability or technical requirements. New technology may exist. This document is intended to specify the environmental conditions for transport aircraft necessary to permit the crew to perform their duties and functions in comfort, with minimum fatigue and no distraction. Environment conditions should cause no short or long-term effects deleterious to health or physical well-being, nor significantly impair ability to perform normal or abnormal crew functions.