Brakes and nose wheel steering lost as light transport is being parked.

Attributes
ACN	148033
Time
Date	199006
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : dfw
State Reference	TX
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Light Transport, Low Wing, 2 Turboprop Eng
Flight Phase	ground : parked ground other : taxi
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 220 flight time total : 14500 flight time type : 600
ASRS Report	148033
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	aircraft equipment problem : critical other anomaly
Independent Detector	other flight crewa
Resolutory Action	flight crew : declared emergency other
Consequence	Other
Supplementary
Primary Problem	Aircraft

Narrative:

While taxiing in for parking, the electric hydraulic pump failed. When the hydraulic pump failed, the main pressure went to zero and the nose wheel steering and wheel brakes would not work. The aircraft had been slowed for parking and the #1 engine had been feathered in preparation for shutdown on parking. The hydraulic pump failed just after #1 engine had been feathered. The aircraft was slow and started turning to the left when the hydraulic pump failed and nose wheel steering and brakes would not work. The hydraulic pump switch was put in override position but still did not operate. The aircraft was turning toward a construction area and could not be stopped. It appeared that the propellers could possibly hit some construction. The engines were cut and the aircraft nose wheel came to rest against a concrete 'T' wall. There were 28 passengers on board; they were off loaded with a bus as normal. There were no injuries or aircraft damage.

Original NASA ASRS Text

Title: BRAKES AND NOSE WHEEL STEERING LOST AS LTT IS BEING PARKED.

Narrative: WHILE TAXIING IN FOR PARKING, THE ELECTRIC HYD PUMP FAILED. WHEN THE HYD PUMP FAILED, THE MAIN PRESSURE WENT TO ZERO AND THE NOSE WHEEL STEERING AND WHEEL BRAKES WOULD NOT WORK. THE ACFT HAD BEEN SLOWED FOR PARKING AND THE #1 ENG HAD BEEN FEATHERED IN PREPARATION FOR SHUTDOWN ON PARKING. THE HYD PUMP FAILED JUST AFTER #1 ENG HAD BEEN FEATHERED. THE ACFT WAS SLOW AND STARTED TURNING TO THE L WHEN THE HYD PUMP FAILED AND NOSE WHEEL STEERING AND BRAKES WOULD NOT WORK. THE HYD PUMP SWITCH WAS PUT IN OVERRIDE POS BUT STILL DID NOT OPERATE. THE ACFT WAS TURNING TOWARD A CONSTRUCTION AREA AND COULD NOT BE STOPPED. IT APPEARED THAT THE PROPS COULD POSSIBLY HIT SOME CONSTRUCTION. THE ENGS WERE CUT AND THE ACFT NOSE WHEEL CAME TO REST AGAINST A CONCRETE 'T' WALL. THERE WERE 28 PAXS ON BOARD; THEY WERE OFF LOADED WITH A BUS AS NORMAL. THERE WERE NO INJURIES OR ACFT DAMAGE.

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.