Two Mechanics report about their involvement with a #1 engine thrust reverser; inboard center drive unit replacement on a B767-200. The flight crew aborted takeoff after the left engine stopped accelerating at 83% percent; due to the transducer being out of rig.
Synopsis
Two Mechanics report about their involvement with a #1 engine thrust reverser; inboard center drive unit replacement on a B767-200. The flight crew aborted takeoff after the left engine stopped accelerating at 83% percent; due to the transducer being out of rig.
Narrative
During my normal work hours I was given an assignment to Remove and Replace (R & R); the #1 engine inboard (I/B) center drive unit (CDU). The aircraft was to be completed and ready for flight that evening. Work began outside the hangar; in a 100-degree sun; another co-worker was helping me change out the CDU.We referenced the B767 AMM Chapter 78-31-21; to remove the part and to replace it. In that Maintenance Manual there's references for changing out other attached Components from the old CDU to the new one. While I was pre-installing the CDU to the aircraft; my partner was printing more AMM references for me. I glanced through the manual he had printed for me; while installing the CDU and its components. After the CDU was installed I read through the rigging and operational check procedures for the thrust reverser (T/R). I had skimmed through the smaller Components Maintenance Manual for operational checking also. The operational check appeared to be normal and working properly. I thought I had rigged all the parts correctly. After finally operating the T/R several times (stowing and deploying) and looking for maintenance messages in the flight deck; I signed the CDU 'OK for Service' and removed the placard for it. Super tug took the airplane to the gate and was scheduled to leave later that night. The next day I was notified of an aborted takeoff for the aircraft. Left engine stopped accelerating at 83% due to the I/B CDU transducer was slightly out of rig. That transducer was one of the components transferred from the old CDU to the new one and was thought to have been rigged properly. While I remember going through the Maintenance Manual for the transducer rig AMM 78-31-24; step-by-step action was not taken. I need to completely read the Maintenance Manuals and understand 100% of what I'm reading. Not to be fatigued and be in good physical health.
Second reporter narrative
During my normal schedule working hour; Lead gave us a work order to help Mr X work on #1 Inboard (I/B) Thrust Reverser (T/R); Center Drive Unit (CDU) on a B767-200 aircraft. Part was lost for some time; approximately 45 minutes. Found the vehicle parked at the other side of the airport; at one of the gates and my Partner had a drug screening. We were told to get aircraft ready in 3.5 hours; and that there was another airplane down (broke); so to get this one ready to go. Followed procedures per AMM 78-31-21. Helped remove old CDU and went back to the office to print more references; according to paper work. At that time Lead asked me how much have we done; I said maybe 45 minutes to an hour; which at that time it was 18:30. Helped swap part from the old CDU to new CDU and installed on #1 engine. I was notified the next day; that the aircraft aborted takeoff. I wish there was a little more time to install the CDU. There was a little pressure trying to get this airplane ready to go.
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Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.