846TS Test Programs - Crew Escape Systems Testing Crew Escape Systems Testing Tests of ejection seats, extraction seats, and crew escape modules for a variety of aircraft have been conducted in excess of 700 Knots Equivalent Air Speed (KEAS). These tests have included development, qualification, and compatibility tests. A Multi-Axis Seat Ejection (MASE) sled permits a new approach to ejection seat testing. It allows ejections over a range of pitch, roll and yaw angles and dynamic rolling conditions instead of the straight and level conditions that have characterized Track ejection testing over the past 25 years. The MASE sled has a pitch range of +/- 30º, a yaw range of +/- 20º, a roll range of +/- 90º, and the ability to dynamically roll at high rates during a seat ejection sequence.