Narrative:

I; mechanic X; was advised that a B777 had a ground interrupt the previous day; during a pushback engine start for a thrust reverser (T/right) isolation [EICAS] message. I was assigned a maintenance write-up for a hydraulic fluid high particle count item on the B777. I was informed the job was started by previous shift; and the left and right hydraulic systems were depressurized and drained. [We were] also rushed; in a sense that the aircraft was [scheduled] for a flight. I was to work the aircraft outside on the hardstand. I did not feel it should be worked outside due to high winds and hurricane threat. I set up to perform job task and I accepted to work the left engine. I removed the first filter bowl and proceeded to get soaked with hydraulic fluid under pressure; which in turn filled my line tool box and the work lift. I called for help and a lead mechanic and another aircraft maintenance technician (amt) came over to help. It was then that the lead mechanic informed management that the aircraft required hangar space. I had to clean up my body and tools of hydraulic fluid before continuing the task. I completed the filter replacement; safetied them and stowed [lockout] pins in pouch and then broke for lunch. After returning from lunch; the aircraft hydraulic reservoirs were being serviced and completed. Another lead mechanic who was working the aircraft informed me he was going to the flight deck to restore all [circuit] breakers (C/bs) and pressurize [the hydraulic systems] and I was to leak check my side; all filters checked good. At this point; myself and another amt working the aircraft went to sign-off the write-up item because again; they were rushing to get the aircraft to the gate. I signed-off the non-routine item which stated the deactivation of the thrust reverser was reactivated; but I failed to read what was entailed in this task; entrusting [that] all circuit breakers were restored from what I was told; without physically checking myself. It was brought to my attention [that] you can only get this [EICAS] message upon aircraft engine start up. But further information given to me is that two amts had taxied this aircraft from the hangar to the gate and should have seen this [EICAS message] and if so; this ground interrupt would have never happened. I feel human factors played a serious roll in my actions and failure in this task.

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Original NASA ASRS Text

Title: Two aircraft maintenance technicians (AMTs) report a B777 aircraft returned to a departure gate after a Thrust Reverser (T/R) Isolation message had appeared. Two T/R Isolation Valve Circuit Breakers (C/Bs) in the lower E/E Bay had not been reactivated after replacement of Left and Right Hydraulic System filters. Technician was also sprayed with Skydrol hydraulic fluid.

Narrative: I; Mechanic X; was advised that a B777 had a ground interrupt the previous day; during a pushback engine start for a Thrust Reverser (T/R) Isolation [EICAS] message. I was assigned a maintenance write-up for a Hydraulic Fluid High Particle Count item on the B777. I was informed the job was started by previous shift; and the Left and Right Hydraulic Systems were depressurized and drained. [We were] also rushed; in a sense that the aircraft was [scheduled] for a flight. I was to work the aircraft outside on the hardstand. I did not feel it should be worked outside due to high winds and hurricane threat. I set up to perform job task and I accepted to work the Left Engine. I removed the first filter bowl and proceeded to get soaked with hydraulic fluid under pressure; which in turn filled my line tool box and the work lift. I called for help and a Lead Mechanic and another Aircraft maintenance Technician (AMT) came over to help. It was then that the Lead Mechanic informed Management that the aircraft required hangar space. I had to clean up my body and tools of hydraulic fluid before continuing the task. I completed the filter replacement; safetied them and stowed [Lockout] pins in pouch and then broke for lunch. After returning from lunch; the aircraft hydraulic reservoirs were being serviced and completed. Another Lead Mechanic who was working the aircraft informed me he was going to the flight deck to restore all [Circuit] Breakers (C/Bs) and pressurize [the Hydraulic Systems] and I was to leak check my side; all filters checked good. At this point; myself and another AMT working the aircraft went to sign-off the write-up item because again; they were rushing to get the aircraft to the gate. I signed-off the Non-Routine item which stated the deactivation of the Thrust Reverser was reactivated; but I failed to read what was entailed in this task; entrusting [that] all Circuit Breakers were restored from what I was told; without physically checking myself. It was brought to my attention [that] you can only get this [EICAS] message upon aircraft engine start up. But further information given to me is that two AMTs had taxied this aircraft from the hangar to the gate and should have seen this [EICAS message] and if so; this ground interrupt would have never happened. I feel human factors played a serious roll in my actions and failure in this task.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.