A B737-700 first officer turned the 'B' hydraulic pumps off while intending to turn the engine anti-...

Narrative:

First leg of a 3 day trip: I was the flying pilot (hand flying) - on departure I called for engine anti-ice on as we climbed through the cloud deck. Once out of the clouds called for engine anti-ice off. The first officer accidentaly turned the 'B' hydraulic pumps off by accident and restored them back to normal. ([There was] no effect on airplane - no bump etc) a few seconds later the flight cont light illuminated on the master caution. I transferred control to the first officer and found the yaw damper switch had tripped off. Ran QRH procedure and re-established yaw damper operation. Logbook showed flight control work had been accomplished - so I called maintenance control and discussed the situation (yaw damper) system was normal and we made decision to continue to our scheduled destination (all systems normal). [I] entered in the logbook on arrival. The anti-ice switches are located directly below the 'B hydraulic pump switches and they are the same size and shape and in the same relative position when on. [We] could have been distracted with ATC clearance to climb to 9;000 ft. The reason for the yaw damper switch tripping off was due to the fluctuation in hydraulic pressure when the pumps on B system were turned off as reported.

Original NASA ASRS Text

Title: A B737-700 First Officer turned the 'B' Hydraulic pumps OFF while intending to turn the Engine Anti-ice OFF. The switch position activation error caused the Yaw Damper to disconnect because the 'B' hydraulic pressure temporarily dropped.

Narrative: First leg of a 3 day trip: I was the flying pilot (hand flying) - on departure I called for engine anti-ice on as we climbed through the cloud deck. Once out of the clouds called for engine anti-ice off. The First Officer accidentaly turned the 'B' hydraulic pumps OFF by accident and restored them back to normal. ([There was] no effect on airplane - no bump etc) a few seconds later the FLIGHT CONT light illuminated on the Master Caution. I transferred control to the First Officer and found the yaw damper switch had tripped off. Ran QRH procedure and re-established yaw damper operation. Logbook showed flight control work had been accomplished - so I called Maintenance Control and discussed the situation (yaw damper) system was normal and we made decision to continue to our scheduled destination (all systems normal). [I] entered in the logbook on arrival. The anti-ice switches are located directly below the 'B HYD Pump switches and they are the same size and shape and in the same relative position when ON. [We] could have been distracted with ATC clearance to climb to 9;000 FT. The reason for the yaw damper switch tripping OFF was due to the fluctuation in hydraulic pressure when the pumps on B system were turned OFF as reported.

Data retrieved from NASA's ASRS site as of April 2012 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.

Attributes
ACN	957063
Time
Date	201107
Local Time Of Day	0001-0600
Place
Locale Reference	ZZZ.ARTCC
State Reference	US
Environment
Light	Daylight
Aircraft 1
Make Model Name	B737-700
Operating Under FAR Part	Part 121
Flight Phase	Initial Climb
Flight Plan	IFR
Component
Aircraft Component	Switch
Person 1
Function	Captain Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Less Severe Deviation - Procedural Published Material / Policy

A B737-700 first officer turned the 'B' hydraulic pumps off while intending to turn the engine anti-ice off. The switch position activation error caused the yaw damper to disconnect because the 'B' hydraulic pressure temporarily dropped.