AN EMB140 TECHNICIAN SENT OFF LINE FOR WORK ON THE R FAN DISC DID NOT BRING A CALIBRATED TORQUE WRENCH AND FAILED TO BRING THE REQUIRED NEW NUTS PER THE MAINT MANUAL.

Narrative

DURING THE INSTALLATION OF THE R-HAND FAN WHEEL ASSEMBLY I USED A DIAL TORQUE WRENCH TO CHK 3 OF THE OLD NUTS THAT HOLD THE WHEEL ON FOR RUN-ON TORQUE. I USED A CALIBRATED TORQUE WRENCH FROM THE FBO WHERE WE WERE AT AND FOUND THAT THE 3 NUTS HAD ANYWHERE FROM 5-30 INCH-LBS OF RUN-ON TORQUE. I USED THE HIGHEST READING WHICH WAS 30 INCH-LBS AND ADDED IT TO MY FINAL TORQUE OF THE FAN WHEEL. I LATER REALIZED THAT I COULD NOT USE THE FBO'S TORQUE WRENCH; AND WE DID NOT HAVE ONE WITH US. I ALSO LEARNED THAT WE ARE NOT TO REUSE THE OLD NUTS; AND MUST USE NEW NUTS. ALL OF THE USED NUTS THAT I DID INSTALL WERE TORQUED TO 440-460 PLUS THE 30 INCH-LBS. I DECIDED THAT BECAUSE THE TORQUE WRENCH WAS NOT COMPANY X'S AND THE OLD NUTS WERE USED; THAT I NEEDED TO GND THE AIRPLANE BECAUSE THE RUN-ON TORQUE WAS IN QUESTION; AND NEW NUTS NEEDED TO BE INSTALLED PER THE MANUAL. WHILE TRYING TO AVOID FURTHER ACFT DELAY; I CHOSE TO REUSE THE NUTS AND GET THE TORQUE WRENCH FROM THE FBO; THIS WOULD HELP USE RETURN THE ACFT TO SVC QUICKER. I LATER HAD SECOND THOUGHTS ON THE RUN-ON TORQUE VALUES AS I REVIEWED THE DAY'S EVENTS IN MY MIND. AFTER MUCH THOUGHT; I CALLED MY MGR AND TOLD HIM TO GND THE AIRPLANE AND REPLACE THE NUTS. MY MGR REMOVED THE ACFT FROM SVC; AND PARTS; TOOLING; AND QUALIFIED PERSONNEL WERE DISPATCHED TO THE ACFT. I WAS REQUESTED TO RETURN HOME TO ZZZ.