ACFT EQUIP PROB -- ACR HAS A SPLIT FLAP CONDITION DEVELOP DURING RETRACTION.

Narrative

ON TKOF; UPON FLAP RETRACTION FROM FLAPS 2 DEGS TO UP; OUTBOARD FLAPS SPLIT. LEVELED AT 3000 FT MSL; REQUESTED VECTORS TO STAY IN AREA. INVESTIGATED; DISCUSSED; DECIDED; AND FOLLOWED ABNORMAL PROCS. TOOK A LONG FINAL AND PERFORMED THE SPLIT FLAP LNDG. MAINT SURMISED THAT; IN THE ABSENCE OF A MECHANICAL PROB; SEVERE RAIN SHOWERS PREVIOUS NIGHT HAD REMOVED LUBRICATION FROM JACKSCREWS. RE-LUBRICATED AND THEY WORKED OK ON GND AND SUBSEQUENT FLTS. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: AFTER LNDG THE 2 FLAP SECTIONS RE- SYNCHRONIZED AND THE MECH SAID THAT HE EXPECTED THE SECTIONS TO DO THIS. THE PROB THAT CAUSED THE SPLIT TRAILING EDGE FLAP WAS LACK OF LUBRICATION ON THE JACKSCREWS THAT POS THE FLAPS. THERE HAD BEEN HVY RAINS THE NIGHT BEFORE AND; ACCORDING TO THE MECH; THE PAST PROC WAS TO RE-LUBRICATE THESE AREAS AFTER SUCH RAINS. BUT NOW THE MECHS ONLY DO SCHEDULED MAINT UNLESS SOMEONE HAS A PROB. THE ACFT WORKED FINE AFTER IT WAS LUBED AND THE FLC FLEW IT THE REST OF THE DAY.