Narrative:

Arrived at the aircraft and the left engine cowl anti ice valve light was on. I called aircraft maintenance and reported the problem. Maintenance decided to placard the left engine cowl anti ice valve to the open position and the left engine high stage bleed valve to the close position. While we taxied out; the left pneumatic pressure was not responding to increased left engine thrust. We had to return to the gate for maintenance look at the airplane. The same two mechanics came back to the airplane and informed us that they closed the wrong bleed valve and that they accidentally touched the ipad while they were working and it changed the page from high stage bleed valve procedure to engine bleed valve procedure. Suggest printing out a copy of the maintenance repair procedure; or make it where the page is locked on the ipad and there is a procedure to unlock it. Maintenance should have to read the repair procedure they just did; to make sure they did the correct procedure; before they can sign off the logbook.

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Original NASA ASRS Text

Title: B737-800 Captain reported Maintenance mistakenly closed the wrong bleed valve in response to an anti-ice valve indication in the cockpit.

Narrative: Arrived at the aircraft and the left engine cowl anti ice valve light was on. I called aircraft maintenance and reported the problem. Maintenance decided to placard the left engine cowl anti ice valve to the open position and the left engine high stage bleed valve to the close position. While we taxied out; the left pneumatic pressure was not responding to increased left engine thrust. We had to return to the gate for maintenance look at the airplane. The same two mechanics came back to the airplane and informed us that they closed the wrong bleed valve and that they accidentally touched the iPad while they were working and it changed the page from high stage bleed valve procedure to engine bleed valve procedure. Suggest printing out a copy of the maintenance repair procedure; or make it where the page is locked on the iPad and there is a procedure to unlock it. Maintenance should have to read the repair procedure they just did; to make sure they did the correct procedure; before they can sign off the logbook.

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.