Large transport at cruise has hydraulic fluid leak. Declared emergency.

Attributes
ACN	249665
Time
Date	199308
Day	Thu
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : pxv
State Reference	IN
Altitude	msl bound lower : 41000 msl bound upper : 41000
Environment
Flight Conditions	Mixed
Light	Night
Aircraft 1
Controlling Facilities	artcc : zid
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	cruise other other
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : instrument pilot : flight engineer pilot : commercial pilot : atp
Experience	flight time last 90 days : 225 flight time type : 1630
ASRS Report	249665
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : commercial pilot : instrument
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : declared emergency other
Consequence	Other
Supplementary
Primary Problem	Aircraft

Narrative:

While in cruise at FL410, fluid started leaking from the left hydraulic system. Emergency procedures were accomplished, shutting off the left electric pump and feathering the left engine pump. Quantity had decreased to .36. As pumps were secured, ptu started automatically and leak continued till quantity reached .06. Ptu shut down automatically and pressure dropped to 10 psi. Quantity then increased to .17. Center was notified of our problem and our desire to continue to dtw. Emergency handling was requested and received. Further asked that emergency equipment be standing by at dtw. Aircraft received priority routing to dtw. Landing gear and flaps were lowered using alternate system and aircraft was landed on runway 21R at dtw without incident. Runway turnoff was accomplished with differential braking, as nosewheel steering was inoperative. After clear of runway, APU was started, engines were shut down, and aircraft inspected by fire and rescue personnel. Gear pins were then installed by ground personnel and aircraft was towed to gate do disembark passenger.

Original NASA ASRS Text

Title: LGT AT CRUISE HAS HYD FLUID LEAK. DECLARED EMER.

Narrative: WHILE IN CRUISE AT FL410, FLUID STARTED LEAKING FROM THE L HYD SYS. EMER PROCS WERE ACCOMPLISHED, SHUTTING OFF THE L ELECTRIC PUMP AND FEATHERING THE L ENG PUMP. QUANTITY HAD DECREASED TO .36. AS PUMPS WERE SECURED, PTU STARTED AUTOMATICALLY AND LEAK CONTINUED TILL QUANTITY REACHED .06. PTU SHUT DOWN AUTOMATICALLY AND PRESSURE DROPPED TO 10 PSI. QUANTITY THEN INCREASED TO .17. CTR WAS NOTIFIED OF OUR PROB AND OUR DESIRE TO CONTINUE TO DTW. EMER HANDLING WAS REQUESTED AND RECEIVED. FURTHER ASKED THAT EMER EQUIP BE STANDING BY AT DTW. ACFT RECEIVED PRIORITY ROUTING TO DTW. LNDG GEAR AND FLAPS WERE LOWERED USING ALTERNATE SYS AND ACFT WAS LANDED ON RWY 21R AT DTW WITHOUT INCIDENT. RWY TURNOFF WAS ACCOMPLISHED WITH DIFFERENTIAL BRAKING, AS NOSEWHEEL STEERING WAS INOP. AFTER CLR OF RWY, APU WAS STARTED, ENGS WERE SHUT DOWN, AND ACFT INSPECTED BY FIRE AND RESCUE PERSONNEL. GEAR PINS WERE THEN INSTALLED BY GND PERSONNEL AND ACFT WAS TOWED TO GATE DO DISEMBARK PAX.

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.