A B737-300 STABILIZER TRIM IS SET AT AN INCORRECT SETTING IN ACCORDANCE WITH THE ACARS WT MANIFEST SETTING; RESULTING IN A NEAR OVER ROTATION ON TKOF AT BOS; MA.

Narrative

BEFORE TKOF; RECEIVED THE FINAL WT MANIFEST AS USUAL OVER THE ACARS AND ENTERED THE FINAL NUMBERS INTO THE FMC. FINAL ZERO FUEL WT WAS SUPPOSEDLY 82.3 AND A FINAL TRIM SETTING OF 5.1 FOR TKOF. JUST AFTER TKOF; THE CAPT TOLD ME THAT IT FELT LIKE HE ALMOST OVER ROTATED AND THAT THE BACK PRESSURE AT TKOF WAS EXTREMELY LIGHT. ABOUT 10 MINS AFTER TKOF; I NOTICED THE MESSAGE LIGHT BLINKING ON THE ACARS INDICATING A MESSAGE WAS WAITING. IT WAS A NEW FINAL WT MANIFEST FROM OPS SENT TO US 5 MINS AFTER WE ALREADY DEPARTED! NEW ZERO FUEL WT 80.2 AND NEW TRIM SETTING OF 4.5. OPS SCREWED UP. THIS EXPLAINS WHY THE CTLS FELT SO LIGHT TO THE CAPT AT ROTATION. SEEMS LIKE A SMALL MATH ERROR BUT IT ALMOST CAUSED US TO HAVE A TAIL STRIKE ON TKOF. SUPPLEMENTAL INFO FROM ACN 534744: CTL SENSITIVITY WAS VERY LIGHT WITH ASSOCIATED QUICKER THAN NORMAL ROTATION RATE. PITCH STOPPED AT APPROX 8 DEGS ACFT NOSE UP WITH SUBSEQUENT LIFTOFF. A SECOND SET OF WTS WAS XMITTED AND RECEIVED WHILE PASSING THROUGH APPROX 14000 FT MSL ON CLBOUT.