TH FOR THE OPEN BALLSCREW IN THE DRIVE MECHANISM OF THE HSTA AND SUBSEQUENT WEAR AND FAILURE OF THE SECONDARY LOAD PATH IN ACCORDANCE WITH SERVICE BUITIN 737-27A1277 R2 10.0 29-230-03 OPERATIONAL CHECK STANDBY RUDDER SYSTEM TO INCLUDE OBSERVING LOW PRESSURE LIGHT OPEN ILLUMINATION AND THEN EXTINGU