A captain reports when he turned on the 'B' (electric) hydraulic pump to perform a flight deck check...

Narrative:

I arrived at aircraft and proceeded with flight deck check. It was the first flight of the day and it was very cold outside. When I turned on the 'B' hydraulic pump; the flight control wheel turned full deflection left. I turned off the pump and the control wheel remained full left. I tried to bring the control wheel back to neutral but was unable to move it. I thought the cold weather may have something to do with it. I called maintenance. They looked over the problem and were not sure what was going on. Upon going outside; they found the spoilers up on one side. I got out of the way and let maintenance do their job. Turns out maintenance was on the aircraft overnight and some how moved the aileron trim control full left which caused the problem. I did not think to check the trim because we never move it much and there is no gauge to check the setting except the markings on the control wheel. I had not put anything in the logbook. Maintenance supervisor said to let it go and not write it up because nothing was wrong and we had not left the gate. The supervisor said they would take the delay. I should have written it up. Maintenance working in cockpit at night. Don't touch anything unless you need to.

Original NASA ASRS Text

Title: A Captain reports when he turned on the 'B' (electric) hydraulic pump to perform a flight deck Check for the first flight of the day; the flight control wheel turned full deflection left. After turning off the hydraulic pump; the control wheel on their B737-400 remained full Left.

Narrative: I arrived at aircraft and proceeded with flight deck check. It was the first flight of the day and it was very cold outside. When I turned on the 'B' Hydraulic pump; the flight control wheel turned full deflection left. I turned off the pump and the control wheel remained full left. I tried to bring the control wheel back to neutral but was unable to move it. I thought the cold weather may have something to do with it. I called Maintenance. They looked over the problem and were not sure what was going on. Upon going outside; they found the Spoilers up on one side. I got out of the way and let Maintenance do their job. Turns out Maintenance was on the aircraft overnight and some how moved the aileron trim control full left which caused the problem. I did not think to check the trim because we never move it much and there is no gauge to check the setting except the markings on the control wheel. I had not put anything in the Logbook. Maintenance Supervisor said to let it go and not write it up because nothing was wrong and we had not left the gate. The Supervisor said they would take the delay. I should have written it up. Maintenance working in cockpit at night. Don't touch anything unless you need to.

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	866174
Time
Date	200912
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Light	Daylight
Aircraft 1
Make Model Name	B737-400
Operating Under FAR Part	Part 121
Flight Phase	Parked
Flight Plan	IFR
Component
Aircraft Component	Aileron Trim System
Person 1
Function	Captain Pilot Flying Other / Unknown
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Critical Deviation - Procedural Published Material / Policy

A captain reports when he turned on the 'B' (electric) hydraulic pump to perform a flight deck check for the first flight of the day; the flight control wheel turned full deflection left. After turning off the hydraulic pump; the control wheel on their B737-400 remained full left.