Captain of widebody transport air carrier aircraft mistakenly shut off all hydraulic system to the aircraft controls causing the aircraft to climb above assigned altitude.

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Attributes
ACN	207132
Time
Date	199204
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : den
State Reference	CO
Altitude	msl bound lower : 35000 msl bound upper : 36500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zdv tower : msp
Operator	common carrier : air carrier
Make Model Name	Widebody, Low Wing, 4 Turbojet Eng
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : flight engineer pilot : atp
Experience	flight time last 90 days : 150 flight time total : 7000 flight time type : 1000
ASRS Report	207132
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : less severe altitude deviation : excursion from assigned altitude non adherence : clearance
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : regained aircraft control flight crew : overcame equipment problem
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	Pilot Deviation

Narrative:

While in cruise at 35000 ft with #2 autoplt in command mode and altitude hold, the so declared we had a hydraulic leak in #3 system. The captain turned off all flight control hydraulic power switches. The so immediately told the captain that these switches should not be turned off. By the time hydraulics were restored to the flight controls, the aircraft had climbed to 36500 ft. When hydraulic power was restored to the elevators, the first officer descended back to 35000 ft. The captain notified center we had a hydraulic problem. Center indicated they had no traffic in our area.

Original NASA ASRS Text

Title: CAPT OF WDB ACR ACFT MISTAKENLY SHUT OFF ALL HYD SYS TO THE ACFT CTLS CAUSING THE ACFT TO CLB ABOVE ASSIGNED ALT.

Narrative: WHILE IN CRUISE AT 35000 FT WITH #2 AUTOPLT IN COMMAND MODE AND ALT HOLD, THE SO DECLARED WE HAD A HYD LEAK IN #3 SYS. THE CAPT TURNED OFF ALL FLT CTL HYD PWR SWITCHES. THE SO IMMEDIATELY TOLD THE CAPT THAT THESE SWITCHES SHOULD NOT BE TURNED OFF. BY THE TIME HYDS WERE RESTORED TO THE FLT CTLS, THE ACFT HAD CLBED TO 36500 FT. WHEN HYD PWR WAS RESTORED TO THE ELEVATORS, THE FO DSNDED BACK TO 35000 FT. THE CAPT NOTIFIED CTR WE HAD A HYD PROBLEM. CTR INDICATED THEY HAD NO TFC IN OUR AREA.

Data retrieved from NASA's ASRS site as of July 2007 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.