Flight crew of an light transport declared an emergency and returned to land after experiencing a complete hydraulic failure due to a leak in an up pressure hydraulic line.

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Attributes
ACN	335522
Time
Date	199605
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : ba l airport : iad
State Reference	MD
Altitude	msl bound lower : 11000 msl bound upper : 11000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : iad
Operator	common carrier : air carrier
Make Model Name	Jetstream 32
Operating Under FAR Part	Part 135
Flight Phase	cruise other descent other landing other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 270 flight time total : 4600 flight time type : 620
ASRS Report	335522
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	other flight crewa
Resolutory Action	flight crew : declared emergency other other
Consequence	Other
Supplementary
Primary Problem	Aircraft

Narrative:

Over baltimore VOR first officer asked me if I heard anything unusual. I took off my headset and indeed heard a grinding sound. We searched our instruments to find the right hydraulic pump pressure indicator was fluctuating between 0 and 1500 psi ( in sync with the noise observed). First officer ran the QRH and then we switched controls and I again ran the QRH to verify everything complete. The hydraulic system completely failed thus we were required to lower the landing gear via the emergency method. An emergency was declared and we received vectors for an ILS to runway 19L iad. The approach and landing were uneventful, with the aircraft stopped on the runway and later towed to parking. Callback conversation with reporter revealed the following information: reporter stated that the aircraft was a british aerospace model jetstream 32 which was found to have a leak in one of the gear up lines causing the hydraulic fluid to be lost after gear retraction. The flaps did come down to 10 percent before all fluid was lost. The reporter has not experienced any other problems with the hydraulic system of this aircraft.

Original NASA ASRS Text

Title: FLC OF AN LTT DECLARED AN EMER AND RETURNED TO LAND AFTER EXPERIENCING A COMPLETE HYD FAILURE DUE TO A LEAK IN AN UP PRESSURE HYD LINE.

Narrative: OVER BALTIMORE VOR FO ASKED ME IF I HEARD ANYTHING UNUSUAL. I TOOK OFF MY HEADSET AND INDEED HEARD A GRINDING SOUND. WE SEARCHED OUR INSTS TO FIND THE R HYD PUMP PRESSURE INDICATOR WAS FLUCTUATING BTWN 0 AND 1500 PSI ( IN SYNC WITH THE NOISE OBSERVED). FO RAN THE QRH AND THEN WE SWITCHED CTLS AND I AGAIN RAN THE QRH TO VERIFY EVERYTHING COMPLETE. THE HYD SYS COMPLETELY FAILED THUS WE WERE REQUIRED TO LOWER THE LNDG GEAR VIA THE EMER METHOD. AN EMER WAS DECLARED AND WE RECEIVED VECTORS FOR AN ILS TO RWY 19L IAD. THE APCH AND LNDG WERE UNEVENTFUL, WITH THE ACFT STOPPED ON THE RWY AND LATER TOWED TO PARKING. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATED THAT THE ACFT WAS A BRITISH AEROSPACE MODEL JETSTREAM 32 WHICH WAS FOUND TO HAVE A LEAK IN ONE OF THE GEAR UP LINES CAUSING THE HYD FLUID TO BE LOST AFTER GEAR RETRACTION. THE FLAPS DID COME DOWN TO 10 PERCENT BEFORE ALL FLUID WAS LOST. THE RPTR HAS NOT EXPERIENCED ANY OTHER PROBS WITH THE HYD SYS OF THIS ACFT.

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.