What was found
THE VACUUM PUMPS OVERBOARD AIR LINE SHOWED SIGNS OF DAMAGED THREADS, AND WORKED OUT OF THE PUMP. WHEN IT FELL, ITS PRESUMED THAT IT BECAME CAUGHT IN THE NOSE GEARS DOWN LOCK MECHANISM. ON LANDING, THE NOSE GEAR WOULD NOT FULLY EXTEND OR LOCK, CAUSING A SAFE NOSE GEAR UP LANDING AT SMO. (WP200404833/ INCIDENT NR IWP 23004004)