An air carrier large transport had a failure of one of its hydraulic system. It flew on to its destination and declared an emergency.

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Attributes
ACN	237755
Time
Date	199303
Day	Wed
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : dtw
State Reference	MI
Altitude	msl bound lower : 37000 msl bound upper : 37000
Environment
Flight Conditions	IMC
Light	Night
Aircraft 1
Controlling Facilities	tracon : dtw tower : dtw tower : roc
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	descent : approach landing other other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : flight engineer
Experience	flight time last 90 days : 120 flight time total : 10000 flight time type : 1200
ASRS Report	237755
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : declared emergency none taken : anomaly accepted other
Consequence	Other
Supplementary
Primary Problem	Aircraft

Narrative:

Loss of 1 hydraulic system required the use of gravity extension of landing gear, 1 pair of spoilers inoperative, nosewheel steering inoperative. Aircraft was dispatched with 1 flight control computer inoperative (as per MEL). WX in destination was not great but better than other nearby locations. Elected to proceed and declare emergency with approach control. Landing was uneventful and was towed to gate by company tug.

Original NASA ASRS Text

Title: AN ACR LGT HAD A FAILURE OF ONE OF ITS HYD SYS. IT FLEW ON TO ITS DEST AND DECLARED AN EMER.

Narrative: LOSS OF 1 HYD SYS REQUIRED THE USE OF GRAVITY EXTENSION OF LNDG GEAR, 1 PAIR OF SPOILERS INOP, NOSEWHEEL STEERING INOP. ACFT WAS DISPATCHED WITH 1 FLT CTL COMPUTER INOP (AS PER MEL). WX IN DEST WAS NOT GREAT BUT BETTER THAN OTHER NEARBY LOCATIONS. ELECTED TO PROCEED AND DECLARE EMER WITH APCH CTL. LNDG WAS UNEVENTFUL AND WAS TOWED TO GATE BY COMPANY TUG.

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.