An air carrier B757 had a hydraulic leak in a landing gear down line on final approach.

Attributes
ACN	336822
Time
Date	199605
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : dfw
State Reference	TX
Altitude	agl bound lower : 0 agl bound upper : 1000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : dfw
Operator	common carrier : air carrier
Make Model Name	B757-200
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	descent : approach landing other
Route In Use	approach : straight in
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 170 flight time total : 16000 flight time type : 4200
ASRS Report	336822
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 210 flight time total : 9000 flight time type : 2000
ASRS Report	336921
Events
Anomaly	aircraft equipment problem : less severe
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	none taken : anomaly accepted other
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

Left hydraulic system pressurization/quantity failure. On final to runway 18R dfw, left hydraulic quantity EICAS message illuminated. At about 1000 ft AGL, with gear down and locked and just after reaching flaps 30 degrees position, hydraulic quantity was .25 with hydraulic pressurization about 2950 psi and stable. At about 500 ft AGL, hydraulic quantity went to 0 with pressure falling rapidly. Completed uneventful landing. Problem: leak in gear down line. Supplemental information from acn 336921: we stopped aircraft on taxiway to complete checklists, coordinate with maintenance for a tow and passenger service to keep them informed of our situation and location. The first ATC knew we had a problem was when we were on the taxiway and requesting to hold position to fix a problem.

Original NASA ASRS Text

Title: AN ACR B757 HAD A HYD LEAK IN A LNDG GEAR DOWN LINE ON FINAL APCH.

Narrative: L HYD SYS PRESSURIZATION/QUANTITY FAILURE. ON FINAL TO RWY 18R DFW, L HYD QUANTITY EICAS MESSAGE ILLUMINATED. AT ABOUT 1000 FT AGL, WITH GEAR DOWN AND LOCKED AND JUST AFTER REACHING FLAPS 30 DEGS POS, HYD QUANTITY WAS .25 WITH HYD PRESSURIZATION ABOUT 2950 PSI AND STABLE. AT ABOUT 500 FT AGL, HYD QUANTITY WENT TO 0 WITH PRESSURE FALLING RAPIDLY. COMPLETED UNEVENTFUL LNDG. PROB: LEAK IN GEAR DOWN LINE. SUPPLEMENTAL INFO FROM ACN 336921: WE STOPPED ACFT ON TXWY TO COMPLETE CHKLISTS, COORDINATE WITH MAINT FOR A TOW AND PAX SVC TO KEEP THEM INFORMED OF OUR SIT AND LOCATION. THE FIRST ATC KNEW WE HAD A PROB WAS WHEN WE WERE ON THE TXWY AND REQUESTING TO HOLD POS TO FIX A PROB.

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.