FS2004 – AChS-1 Gauge flight2000it 13 years ago FS2004 – AChS-1 Gauge1. AChS-1 is a 12-hour dial clock with special chronograph and an 12-hour elapsed time features designed for use as a navigational instrument in aircraft. By Alexander Belov. 250 Kb FS2004 – Taos Regional AirportFS2004 – Kishangarh AirportFS2004 – Sopwith Bee