Narrative:

B777-200 aircraft arrived ZZZ january 2015. Myself [as mechanic X] and mechanic Y were assigned the ETOPS inspection and inbound logbook items. Had EICAS message: bleed high pressure shut-off valve (hpsov) right engine. Interrogated [aircraft's] maintenance access terminal (mat); insufficient time to repair; optioned for MEL deferral (dfrl) [chap] 36-3a. Aircraft departed to ZZZ to ZZZZ january 2015 in am. Departing ZZZZ following day; pilot reported bleed 'off' engine right; 'on' at cruise power setting. We were using the maintenance tablet to follow procedure MEL 36-3a on how to lock out the hpsov [on the] right engine. The first illustration that we scrolled to showed the valve position for the wrong valve; figure-1; causing us to lock out the wrong valve.[recommend] when pulling the MEL on the desktop computer to follow the procedures on how to lock the hpsov; a figure is attached to the MEL; clicking it will take you to the correct valve position. It is not confusing; however; on the maintenance tablet you have to scroll to the figure; leading the user to assume the figure shown is related to the referenced MEL. That is not the case in this situation. The figure shown was the wrong valve; which contributed to the error.

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Original NASA ASRS Text

Title: Two Line Aircraft Maintenance Technicians (AMTs) explain why different procedures must be used to access the correct MEL illustration for deferring a High Pressure Shut-Off Valve (HPSOV) on a B777-200 engine when using a desktop computer or maintenance tablet. They had locked out a Pressure Regulating Shut-Off Valve (PRSOV) on the right engine instead of the HPSOV.

Narrative: B777-200 aircraft arrived ZZZ January 2015. Myself [as Mechanic X] and Mechanic Y were assigned the ETOPS inspection and inbound logbook items. Had EICAS message: Bleed High Pressure Shut-off Valve (HPSOV) Right Engine. Interrogated [aircraft's] Maintenance Access Terminal (MAT); insufficient time to repair; optioned for MEL Deferral (DFRL) [Chap] 36-3a. Aircraft departed to ZZZ to ZZZZ January 2015 in AM. Departing ZZZZ following day; pilot reported Bleed 'Off' engine right; 'On' at cruise power setting. We were using the maintenance tablet to follow procedure MEL 36-3a on how to lock out the HPSOV [on the] right engine. The first illustration that we scrolled to showed the valve position for the wrong valve; figure-1; causing us to lock out the wrong valve.[Recommend] When pulling the MEL on the desktop computer to follow the procedures on how to lock the HPSOV; a figure is attached to the MEL; clicking it will take you to the correct valve position. It is not confusing; however; on the maintenance tablet you have to scroll to the figure; leading the user to assume the figure shown is related to the referenced MEL. That is not the case in this situation. The figure shown was the wrong valve; which contributed to the error.

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.