Narrative:

On the md-90 when you reach clean speed in this case 253 KTS; you call for bank angle 25 degrees and after takeoff checklist. This particular departure makes you work; and on climb out the first officer and I discussed leaving the slats extended so we can make the turn at around 210-220 KTS; and use 25 degrees of bank. We did this and as we rolled back south the controller cleared us to 15;000 ft. I asked if the at or below 5;000 restriction on the 047 degree radial was cancelled and she said yes. She told us we could turn toward the departure airport at anytime but we still had the 12;000 ft or above restriction at the departure airport's VOR. We turned back to the departure airport and continued our climb. When we rolled out north again; the first officer called for slats up and I put the slat ups. I then went back to back 15 degrees because we were at 220 KTS. I remember seeing out of the corner of my eye the first officer reach down and turn off the aux and transfer pumps. We accelerated to 250 KTS and the first officer called for bank 25 degrees again and after takeoff checklist. As I did the checklist and noticed the aux transfer pumps were still on and asked the first officer to turn them off. He did so and we began to lose hydraulic pressure; on both sides. I told him to turn the pumps back on and the pressure went back to normal. He then pointed out to me that he turned the engine pumps off by accident. He turned the engine pumps back on; and turned the aux pumps off and we continued the flight without event. Experienced first officer turned those pumps off for the captain because of the reach; it is an accepted practice; but proper procedure has the pilot not flying turning off those pumps.

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Original NASA ASRS Text

Title: An MD-90 Captain reported completing the After Takeoff Checklist and when the aux pumps were turned off the hydraulic pressure began dropping. After turning the pumps back on it was discovered that the First Officer had earlier turned the engine driven pumps off in error.

Narrative: On the MD-90 when you reach clean speed in this case 253 KTS; you call for bank angle 25 degrees and after takeoff checklist. This particular departure makes you work; and on climb out the First Officer and I discussed leaving the slats extended so we can make the turn at around 210-220 KTS; and use 25 degrees of bank. We did this and as we rolled back south the Controller cleared us to 15;000 FT. I asked if the at or below 5;000 restriction on the 047 degree radial was cancelled and she said yes. She told us we could turn toward the departure airport at anytime but we still had the 12;000 FT or above restriction at the departure airport's VOR. We turned back to the departure airport and continued our climb. When we rolled out north again; the First Officer called for slats up and I put the slat ups. I then went back to back 15 degrees because we were at 220 KTS. I remember seeing out of the corner of my eye the First Officer reach down and turn off the aux and transfer pumps. We accelerated to 250 KTS and the First Officer called for bank 25 degrees again and after takeoff checklist. As I did the checklist and noticed the aux transfer pumps were still on and asked the First Officer to turn them off. He did so and we began to lose hydraulic pressure; on both sides. I told him to turn the pumps back on and the pressure went back to normal. He then pointed out to me that he turned the engine pumps off by accident. He turned the engine pumps back on; and turned the aux pumps off and we continued the flight without event. Experienced First Officer turned those pumps off for the Captain because of the reach; it is an accepted practice; but proper procedure has the pilot not flying turning off those pumps.

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.