A B757-200 was delivered to the gate from maintenance in non compliance with the right hydraulic system supply isolation valve closed. Aircraft had loss of braking and steering control after pushback.

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Attributes
ACN	589365
Time
Date	200307
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	ground : maintenance ground : pushback
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : cfi pilot : atp
Experience	flight time last 90 days : 150 flight time total : 8000 flight time type : 2800
ASRS Report	589365
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	aircraft equipment problem : critical maintenance problem : improper documentation maintenance problem : improper maintenance non adherence : published procedure non adherence : far other anomaly
Independent Detector	aircraft equipment other aircraft equipment : eicas warning ptu other flight crewa other flight crewb
Resolutory Action	none taken : detected after the fact
Consequence	other
Factors
Maintenance	contributing factor : work cards contributing factor : schedule pressure performance deficiency : non compliance with legal requirements performance deficiency : logbook entry performance deficiency : scheduled maintenance performance deficiency : testing performance deficiency : inspection
Supplementary
Problem Areas	Maintenance Human Performance Aircraft
Primary Problem	Maintenance Human Performance

Narrative:

After pushback and at completion of engine start the airplane started to roll with parking brake set. An EICAS message appeared 'power xfer unit.' the nosewheel steering did not work and minimum pressure on the brakes. Shut down the engines and the airplane rolled and stopped within feet of another aircraft. The airplane had just returned from maintenance hangar. Maintenance towed us back to the gate. Callback conversation with reporter revealed the following information: the reporter stated the airplane was delivered to the gate out of maintenance in an unserviceable and unairworthy condition. The reporter said maintenance would not admit the airplane had an inoperable right hydraulic system caused by the right supply isolation valve being closed manually with the electrical connector removed while in maintenance. The reporter stated no warning tags or placards were on the valve control switches.

Original NASA ASRS Text

Title: A B757-200 WAS DELIVERED TO THE GATE FROM MAINT IN NON COMPLIANCE WITH THE R HYD SYS SUPPLY ISOLATION VALVE CLOSED. ACFT HAD LOSS OF BRAKING AND STEERING CTL AFTER PUSHBACK.

Narrative: AFTER PUSHBACK AND AT COMPLETION OF ENG START THE AIRPLANE STARTED TO ROLL WITH PARKING BRAKE SET. AN EICAS MESSAGE APPEARED 'PWR XFER UNIT.' THE NOSEWHEEL STEERING DID NOT WORK AND MINIMUM PRESSURE ON THE BRAKES. SHUT DOWN THE ENGS AND THE AIRPLANE ROLLED AND STOPPED WITHIN FEET OF ANOTHER ACFT. THE AIRPLANE HAD JUST RETURNED FROM MAINT HANGAR. MAINT TOWED US BACK TO THE GATE. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE AIRPLANE WAS DELIVERED TO THE GATE OUT OF MAINT IN AN UNSERVICEABLE AND UNAIRWORTHY CONDITION. THE RPTR SAID MAINT WOULD NOT ADMIT THE AIRPLANE HAD AN INOPERABLE R HYD SYS CAUSED BY THE R SUPPLY ISOLATION VALVE BEING CLOSED MANUALLY WITH THE ELECTRICAL CONNECTOR REMOVED WHILE IN MAINT. THE RPTR STATED NO WARNING TAGS OR PLACARDS WERE ON THE VALVE CTL SWITCHES.

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.