Narrative:

After landing at ZZZ on runway 22R, we proceeded to taxi to our gate. When the first officer brought the flaps up as part of his after landing duties, the #4 leading edge slat failed to retract. Upon arriving at the gate, he sent an ACARS message to maintenance control and wrote up the discrepancy in the logbook. While thanking the passenger as they were departing the aircraft, a mechanic came up and said, 'captain, you need to see your right wing.' after going down to the ramp, I observed that the fueling panel was open and was jammed up against the slat, thus preventing the retraction. The first officer said that he did not experience any 'rolling' tendencies during the flight. Apparently, the door came open after landing when there was no longer any slipstream air keeping it closed. Supplemental information from acn 620973: as the pilot, exterior inspection was accomplished prior to the completion of refueling and the underwing fueling door is not visible from the cockpit (without opening the window). The captain and I were unaware of how or when the fueling door came to be open.

Related reports:

Google
 

Original NASA ASRS Text

Title: A B737-500 WAS DISPATCHED IN NON COMPLIANCE WITH THE R WING FUELING DOOR NOT SECURED AFTER FUELING. DOOR JAMMED IN #4 SLAT ON REVERSING.

Narrative: AFTER LNDG AT ZZZ ON RWY 22R, WE PROCEEDED TO TAXI TO OUR GATE. WHEN THE FO BROUGHT THE FLAPS UP AS PART OF HIS AFTER LNDG DUTIES, THE #4 LEADING EDGE SLAT FAILED TO RETRACT. UPON ARRIVING AT THE GATE, HE SENT AN ACARS MESSAGE TO MAINT CTL AND WROTE UP THE DISCREPANCY IN THE LOGBOOK. WHILE THANKING THE PAX AS THEY WERE DEPARTING THE ACFT, A MECH CAME UP AND SAID, 'CAPT, YOU NEED TO SEE YOUR R WING.' AFTER GOING DOWN TO THE RAMP, I OBSERVED THAT THE FUELING PANEL WAS OPEN AND WAS JAMMED UP AGAINST THE SLAT, THUS PREVENTING THE RETRACTION. THE FO SAID THAT HE DID NOT EXPERIENCE ANY 'ROLLING' TENDENCIES DURING THE FLT. APPARENTLY, THE DOOR CAME OPEN AFTER LNDG WHEN THERE WAS NO LONGER ANY SLIPSTREAM AIR KEEPING IT CLOSED. SUPPLEMENTAL INFO FROM ACN 620973: AS THE PLT, EXTERIOR INSPECTION WAS ACCOMPLISHED PRIOR TO THE COMPLETION OF REFUELING AND THE UNDERWING FUELING DOOR IS NOT VISIBLE FROM THE COCKPIT (WITHOUT OPENING THE WINDOW). THE CAPT AND I WERE UNAWARE OF HOW OR WHEN THE FUELING DOOR CAME TO BE OPEN.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.