A B737-300 REJECTED A TKOF DUE TO DIFFERENCES BTWN THE CAPT'S AND FO'S AIRSPD INDICATORS CAUSED BY DISCONNECTED PITOT AND STATIC LINES.

Narrative

ON NOV/XA/99 ACFT XYZ HAD TO ABORT TKOF DUE TO #2 AIRSPD (FO) READING DRASTICALLY DIFFERENT THAN THE CAPT. UPON TROUBLESHOOTING; THE MECH FOUND #2 ADC PITOT STALL LINES DISCONNECTED. THIS ACFT WAS JUST RELEASED FROM ZZZ HVY MAINT. THE REASON FOR THE VISIT WAS TO INSTALL THE SYNC LOC MODIFICATION ON THE THRUST REVERSER SYS. SINCE THIS ACFT WAS NOT IN FOR A FULL BLOWN QUALITY CHK; THE FLOORS WERE NOT REMOVED TO GAIN ACCESS TO A SPLICE JOINT THAT WAS REQUIRED IN THE AIRWORTHINESS DIRECTIVE AND ENGINEERING ORDER. ORIGINALLY; I THOUGHT I WOULD BE ACCESSING THIS AREA FROM THE FORWARD CARGO BAY; FORWARD WALL (BULKHEAD) ON THE R SIDE. I FOUND THAT BECAUSE OF THE OXYGEN BOTTLE BEING IN THE WAY THAT IT WOULD MAKE ACCESSIBILITY DIFFICULT. I DECIDED I COULD DO IT BY REMOVING THE #1 AND #2 IRU'S AND SLIDING MY BODY IN THAT WAY. THIS WAS SUCCESSFUL AND ALL WORK WAS ACCOMPLISHED. BY THIS TIME THE END OF SHIFT HAD COME AND I DECIDED TO LEAVE THE IRU'S OUT AND LEAVE A TURN OVER WITH THE LAST SENTENCE STATING L AND R IRU'S REMOVED TO FACILITATE MAINT ON AN OM26-1 (NOW MANY TIMES THE #2 ADC PITOT-STATIC LINES ARE DISCONNECTED TO ALLOW REMOVAL OF THE #1 (L) IRU. WHEN IRU'S WERE REINSTALLED THEY WERE NOT WRITTEN UP AS REINSTALLING AND NO OPS CHK WAS PERFORMED (R5 CARD). THIS IS WHERE I BELIEVE SOMEONE REMOVED THE #2 PITOT STATIC LINES.