Throttle position for engine 1. The range is -1 to 1, where negative values mean reverse thrust. Measured in fractional units. Read-write.
Example
'Read the position of engine 1 throttle.
IF THROTTLE_1 < 1.0 THEN
PRINT "Use full throttle for takeoff."
ENDIF
'Create engine failure on takeoff.
WHILE VELOCITY_INDICATED < 60
WAIT 1
ENDWHILE
'Reduce throttle 1 to 0.
THROTTLE_1 = 0