scope:

Description of Driving Event:

During hydrazine servicing of the left hand SRB tilt system, the fill/drain quick disconnect (Q.D.) nipple separated during cap removal, allowing the entire 3 1/2 gallon load to drain onto the MLP deck. The Q.D. nipple separation occurred because of nipple to cap thread seizure, caused by pressure build-up between the Q.D. and cap. Current design allows the possibility of Q.D. nipple removal while trying to remove Q.D. cap. The technician had no visual clue that the nipple was turning because of the scupper installation. The technician was drenched with hydrazine during the incident.