Maintenance Powerplant; Maintenance Airframe
Maintenance Lead Technician 5; Maintenance Technician 16
Situational Awareness; Troubleshooting; Fatigue; Confusion; Communication Breakdown
Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural Published Material / Policy
General Maintenance Action
Chart Or Publication; Human Factors; Manuals
October 2013; I had B757-200 aircraft Work Package that included troubleshooting (T/S) of the Auto Speed Brake System. I found that the Auto Speed Brake actuator was at fault. I checked the RII list to see if the replacement of the actuator was RII; and per RII list 27-62-02 it does not.  I printed out the Aircraft Maintenance Maintenance Manual (AMM) reference 27-62-02-022 and read the instructions. Because I was tired and had already checked the RII list; I missed the paragraph in the AMM that said the Auto Speed Brake mechanism had to be removed to change the actuator and that requires an RII Inspection. I replaced the actuator with no problems and all tests were good and the aircraft went back into service with no problems. I feel that this mistake was because I was too tired and the AMM included a note that was opposite to what the RII list has. There is no need to remove the mechanism to replace this actuator and that threw me off too; but the mechanism needs an RII.  I know that the AMM takes preference over all other documents and I made the mistake of not reading the AMM carefully enough; that will never happen again.
A Lead Aircraft Maintenance Technician (AMT) was informed he missed a required RII Inspection of an Auto Speed Brake mechanism after replacing an Auto Speed Brake actuator on a B757-200 aircraft. Technician noted that fatigue; along with a misunderstanding of a 'Note' in the Aircraft Maintenance Manual (AMM) procedures contributed to the missed RII requirement.