MECHANIC WORKING ON A ROLLS ROYCE RB-211 ENGINE NOTICED A REVISION HAD BEEN INCLUDED IN THE JOB CARD REQUIRING A MAG PARTICLE INSPECTION.

Narrative

I WAS WORKING UNDER REVISION 17; WHICH DID NOT INCLUDE A CRACK CHK ON IPT SHAFT DURING A JOB CARD. A REVISION #18 CAME OUT MID JUNE. I MISSED THE LINE IN THE NEW REVISION ABOUT CRACK TESTING THE IPT SHAFT ON LEVEL 3 WORKSCOPE. IMMEDIATELY UPON NOTICING; IN OCT/07; ENGINEERING WAS NOTIFIED ABOUT THIS LINE IN QUESTION. REVISION #18 WAS RESCINDED AND THE CRACK TEST LANGUAGE FOR THE IPT SHAFT WAS CHANGED TO STATE THAT ONLY WHEN A SHAFT AND DISK IS SEPARATED IS THE SHAFT AND DISK TO BE CRACK CHKED. THE LINE THAT STATED TO MANDATORILY CRACK THE IPT SHAFT DURING A LEVEL 3 WORKSCOPE WAS WRITTEN IN ERROR ACCORDING TO ENGINEERING. ALL ROTOR ASSEMBLIES MET THE INTENT OF THE JOB CARD WRITTEN BY ENGINEERING. NO NOTIFICATION OF NEW REVISION. ALSO CONFLICTING WORDING AND INTENT IN LANGUAGE. CONSTANT CHKING OF COMPUTER REVISIONS. NOTIFY ENGINEERING OF ANY CONFLICTING STATEMENTS. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: REPORTER STATED HE NOTICED THE NEW REVISION WAS INCLUDED IN A JOB CARD DOCUMENT THAT NORMALLY DID NOT REQUIRE THE MANDATORY CRACK CHECK OF THE INTERMEDIATE PRESSURE TURBINE SHAFT (IPT) USING A MAGNETIC PARTICLE INSPECTION PROCEDURE. THE ENGINE VISIT LEVEL THEY WERE DOING DID NOT INCLUDE SEPARATING THE IPT FROM THE IPTS (SHAFT) UNLESS SERIOUS DAMAGE OR CORROSION WERE FOUND. THE LEVEL OF ENGINE WORK THAT HAD REQUIRED A MAG PARTICLE CRACK CHECK; ALSO REQUIRED THE IPT TO BE SEPARATED FROM THE IPT SHAFT. SO HE AND OTHER MECHANICS WERE SURPRISED TO SEE THE REVISION IN THE PAPERWORK; WHICH APPEARS TO HAVE BEEN THERE FOR SOME WEEKS. HE IMMEDIATELY NOTIFIED ENGINEERING AND THEY IN TURN RECOGNIZED THE ERROR OF INCLUDING THE MANDATORY CRACK INSPECTION REVISION IN THAT PAPERWORK. THE NEW REVISION WAS RESCINDED.