What was found
(CAN) DURING APPROACH, THERE WAS A FLAP FAIL MSG. ACFT LANDED WITH FLAPS LOCKED OUT. TROUBLESHOOTING REVEALED THAT GEARBOX SPLINED SHAFT AND DRIVE SHAFT WERE NOT LOCKED INTO PLACE BY LOCK SCREW. SIMILAR SCENARIO OCCURRED ON RHS, WHERE THE IB MOST FLAP ACTUATOR DISCONNECTED WITH THE SPLINE IN THE SAME WAY. THE LOCKBOLT WAS IN PLACE AND SAFETIED, BUT WAS NOT INSTALLED THROUGH THE HOLE IN THE SPLINED SHAFT. ANGLED GEARBOX PN IS AS ABOVE, BUT FLAP ACTUATOR PN IS C154814-2. (TC NR 20070410002)