Narrative:

Flight operated with improper placard. Aircraft had upper red strobe light placarded inoperative. Placarded as 33-13A, day operations. Should have been 33-13B, night operations. Wingtips' strobes were operable. Maintenance failed to properly re-placard upper strobe after wingtip strobes were repaired. Aircraft operate 3 days with this placard. I missed the signoff of the wingtip strobes because I reviewed just the required 3 days of entries. During origination preflight with maintenance at XA45, nov/xa/01 at ZZZ, upper strobe was confirmed operable. Placard removed. During my review of the logbook and MEL I missed the day/night difference. I assumed since the airplane came in at night that it was good to go out again at night. Also, when maintenance removed the placard for the tip strobes, they failed to reissue the placard in the computer for the upper strobe, hence dispatch knew nothing about the item.

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Original NASA ASRS Text

Title: A B757-200 WAS DISPATCHED IN NON COMPLIANCE IN DARKNESS WITH THE UPPER RED STROBE LIGHT INOP USING THE WRONG MEL REF.

Narrative: FLT OPERATED WITH IMPROPER PLACARD. ACFT HAD UPPER RED STROBE LIGHT PLACARDED INOP. PLACARDED AS 33-13A, DAY OPS. SHOULD HAVE BEEN 33-13B, NIGHT OPS. WINGTIPS' STROBES WERE OPERABLE. MAINT FAILED TO PROPERLY RE-PLACARD UPPER STROBE AFTER WINGTIP STROBES WERE REPAIRED. ACFT OPERATE 3 DAYS WITH THIS PLACARD. I MISSED THE SIGNOFF OF THE WINGTIP STROBES BECAUSE I REVIEWED JUST THE REQUIRED 3 DAYS OF ENTRIES. DURING ORIGINATION PREFLT WITH MAINT AT XA45, NOV/XA/01 AT ZZZ, UPPER STROBE WAS CONFIRMED OPERABLE. PLACARD REMOVED. DURING MY REVIEW OF THE LOGBOOK AND MEL I MISSED THE DAY/NIGHT DIFFERENCE. I ASSUMED SINCE THE AIRPLANE CAME IN AT NIGHT THAT IT WAS GOOD TO GO OUT AGAIN AT NIGHT. ALSO, WHEN MAINT REMOVED THE PLACARD FOR THE TIP STROBES, THEY FAILED TO REISSUE THE PLACARD IN THE COMPUTER FOR THE UPPER STROBE, HENCE DISPATCH KNEW NOTHING ABOUT THE ITEM.

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.