An airbus 320 in cruise at FL390 declared an emergency due to loss of yellow system hydraulic pressure and quantity caused by a leaking power xfer unit.

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Attributes
ACN	414320
Time
Date	199809
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : sfo
State Reference	CA
Altitude	msl bound lower : 39000 msl bound upper : 39000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : eyw
Operator	common carrier : air carrier
Make Model Name	A320
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	cruise other other
Route In Use	enroute airway : zoa
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : instrument pilot : commercial pilot : flight engineer pilot : atp
Experience	flight time last 90 days : 150 flight time total : 8900 flight time type : 1300
ASRS Report	414320
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : declared emergency none taken : detected after the fact other
Consequence	Other
Supplementary
Primary Problem	Aircraft

Narrative:

En route we got an ECAM warning of a 'hydraulic Y reservoir low level.' we did procedure to turn off that hydraulic system. Then I noticed the other green system low (about 1/2 full). Therefore, with possibility of losing that one, I declared an emergency with trucks standing by at sfo. Descent, approach and landing normal at sfo. Taxi in was ok with all nosewheel steering on this 1/2 full green system. Postflt found a leaking power xfer unit priority valve that connects the yellow to the green system. First officer made landing with only #1 reservoir and most of the spoilers.

Original NASA ASRS Text

Title: AN AIRBUS 320 IN CRUISE AT FL390 DECLARED AN EMER DUE TO LOSS OF YELLOW SYS HYD PRESSURE AND QUANTITY CAUSED BY A LEAKING PWR XFER UNIT.

Narrative: ENRTE WE GOT AN ECAM WARNING OF A 'HYD Y RESERVOIR LOW LEVEL.' WE DID PROC TO TURN OFF THAT HYD SYS. THEN I NOTICED THE OTHER GREEN SYS LOW (ABOUT 1/2 FULL). THEREFORE, WITH POSSIBILITY OF LOSING THAT ONE, I DECLARED AN EMER WITH TRUCKS STANDING BY AT SFO. DSCNT, APCH AND LNDG NORMAL AT SFO. TAXI IN WAS OK WITH ALL NOSEWHEEL STEERING ON THIS 1/2 FULL GREEN SYS. POSTFLT FOUND A LEAKING PWR XFER UNIT PRIORITY VALVE THAT CONNECTS THE YELLOW TO THE GREEN SYS. FO MADE LNDG WITH ONLY #1 RESERVOIR AND MOST OF THE SPOILERS.

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.