A B737-700 HAD WINGS DEICED DUE TO UNDERWING ICE. CREW QUESTIONS WHY AIRWORTHINESS DIRECTIVE SPD RESTRS OF 270 KTS APPLIED. GND TEMP 48 DEGS.

Narrative

DURING THE PREFLT OF A B737-700; THE CREW NOTED THE PRESENCE OF ICE UNDERNEATH THE WINGS IN THE VICINITY OF THE FUEL TANKS (COLD SOAKED WING) AND REQUESTED THAT A WING INSPECTION BE ACCOMPLISHED BY MAINT. MAINT ACCOMPLISHED THE WING INSPECTION AND DETERMINED THAT THE ACFT NEEDED TO BE DEICED. THE OUTSIDE AIR TEMP WAS +9 DEGS C AND IT RAINED LIGHTLY AT THE TIME. THE ACFT WAS DEICED AT THE GATE WITH TYPE 1 FLUID (FP -29C). THE DEICING PROCESS WAS COMPLETED AND A SATISFACTORY 'POST DEICE CHK' WAS RPTED TO THE CREW BY THE DEICE COORDINATOR. WE; THE CREW; THEN CONTACTED MAINT CTL TO HAVE THE ACFT PLACED ON MEL 27-99 FOLLOWING ELEVATOR TAB DEICING OF A B737-700 (FHB 02-3). UNDER THE DIRECTION OF MAINT CTL; THE CREW ENTERED THE FOLLOWING IN THE ACFT MAINT LOG. DISCREPANCY REMARKS: 'ACFT DEICED AT STATION ZZZ.' CORRECTIVE ACTION: 'RELEASE PER MEL 27-99 ELEVATOR TAB DEICED; LIMIT 270 KIAS PER....' MAINT CTL THEN RAISED THE QUESTION OF WHETHER THE ELEVATOR HAD BEEN DEICED (NON-ENVIRONMENTAL ICING). THE CREW WAS INFORMED BY THE DEICE COORDINATOR THAT THE TAIL/ELEVATOR HAD NOT BEEN DEICED; WHICH THE CREW RELAYED TO MAINT CTL. MAINT CTL ASKED THE CREW WHETHER IT WANTED TO CONTINUE WITH MEL 27-99. SINCE MEL 27-99 WOULD HAVE RESTR THE ACFT TO 270 KIAS; THE CREW'S RESPONSE WAS NEGATIVE. MAINT CTL INSTRUCTED THE CREW TO DRAW A LINE THROUGH THE ENTIRE LOGBOOK PAGE AND WRITE 'VOID' WHICH THE CREW ACCOMPLISHED. ON NOV/SAT/02; THE SAME CREW WAS TO OPERATE THE SAME ACFT. UPON REVIEWING THE ACFT MAINT LOG; THE CREW NOTICED THAT THE LOG PAGE CONTAINED THE FOLLOWING: DISCREPANCY REMARK -- 'LOG PAGE X WAS VOIDED INCORRECTLY.' CORRECTIVE ACTION: 'VERIFIED MAINT WAS NOT ACCOMPLISHED; LOG PAGE X IS VOID BY THE AUTH OF MAINT CTL; THE AIRWORTHINESS IS REINSTATED.' WE; THE CREW; ARE CONCERNED THAT WE MAY HAVE OPERATED AN ACFT THAT WASN'T TECHNICALLY AIRWORTHY BASED ON THIS SUBSEQUENT MAINT LOG ENTRY.