<< >> NASA ASRS Report 430385, March 1999

An airbus A320 on descent at FL200 declared an emergency due to loss of the 'green' hydraulic system pressure and quantity. Cause unknown.

Attributes
ACN	430385
Time
Date	199903
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : pbi.airport
State Reference	FL
Altitude	msl single value : 2000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zma.artcc tower : iad.tower
Operator	common carrier : air carrier
Make Model Name	A320
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	descent : vacating altitude
Route In Use	arrival star : llake 2
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : multi engine
Experience	flight time last 90 days : 210 flight time total : 20000 flight time type : 2600
ASRS Report	430385
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : instrument pilot : commercial
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : hydraulic press indication other flight crewa other flight crewb
Resolutory Action	controller : issued new clearance flight crew : declared emergency flight crew : landed in emergency condition
Consequence	other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

During descent, 'hydraulic generator reservoir level low' ECAM message displayed. We coordinated with dispatch and maintenance control via pbi air carrier operations radio and diverted to mia. Declared an emergency with ATC, gravity extended landing gear and landed uneventfully on mia runway 9R for tow-in to gate. Prior to diversion, we held at swomp at 8000 ft. We were unable to talk directly with dispatch/maintenance via company or commercial radio and that slowed problem solving resolution. Callback conversation with reporter revealed the following information: the reporter stated the system that failed was the 'green' system and pwred the landing gear and nose gear steering. The reporter said the cause of the failure is unknown as maintenance made no report on what component was replaced for the corrective action.

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Original NASA ASRS Text

Title: AN AIRBUS A320 ON DSCNT AT FL200 DECLARED AN EMER DUE TO LOSS OF THE 'GREEN' HYD SYS PRESSURE AND QUANTITY. CAUSE UNKNOWN.

Narrative: DURING DSCNT, 'HYD GENERATOR RESERVOIR LEVEL LOW' ECAM MESSAGE DISPLAYED. WE COORDINATED WITH DISPATCH AND MAINT CTL VIA PBI ACR OPS RADIO AND DIVERTED TO MIA. DECLARED AN EMER WITH ATC, GRAVITY EXTENDED LNDG GEAR AND LANDED UNEVENTFULLY ON MIA RWY 9R FOR TOW-IN TO GATE. PRIOR TO DIVERSION, WE HELD AT SWOMP AT 8000 FT. WE WERE UNABLE TO TALK DIRECTLY WITH DISPATCH/MAINT VIA COMPANY OR COMMERCIAL RADIO AND THAT SLOWED PROB SOLVING RESOLUTION. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE SYS THAT FAILED WAS THE 'GREEN' SYS AND PWRED THE LNDG GEAR AND NOSE GEAR STEERING. THE RPTR SAID THE CAUSE OF THE FAILURE IS UNKNOWN AS MAINT MADE NO RPT ON WHAT COMPONENT WAS REPLACED FOR THE CORRECTIVE ACTION.

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.