11. They had reached that point by relying solely on the Coutinho's sextant with its artificial horizon . 12. Gago Coutinho invented a type of sextant incorporating two spirit levels to provide an artificial horizon . 13. Roger Carnahan said he was having trouble with the artificial horizon , used to maintain level flight. 14. Others prefer to use a lit artificial horizon . 15. Wartime use of aircraft accelerated the development of new technologies . air speed and an artificial horizon . 16. If the valve wasn't working, it could have affected the operation of the artificial horizon , she said. 17. Tilt sensors and inclinometers generate an artificial horizon and measure angular tilt with respect to this horizon. 18. Randy Carnahan's training and periodic certification would teach him how to cope when an artificial horizon failed. 19. If the valve wasn't working, it could have affected the operation of the artificial horizon , Carmody said. 20. Other improvements include new warning indicates, a cockpit voice recorder, flight monitoring system, artificial horizon , and modernised electronics.
