Air carrier large transport lost one hydraulic system in-flight.

Attributes
ACN	102073
Time
Date	198901
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : lrp
State Reference	PA
Altitude	msl bound lower : 31000 msl bound upper : 31000
Environment
Flight Conditions	Mixed
Light	Night
Aircraft 1
Controlling Facilities	artcc : zob
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	cruise other
Route In Use	enroute airway : zob
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : cfi pilot : atp pilot : flight engineer
Experience	flight time last 90 days : 240 flight time total : 9000 flight time type : 850
ASRS Report	102073
Person 2
Affiliation	company : air carrier
Function	flight crew : second officer
Qualification	pilot : flight engineer
Events
Anomaly	aircraft equipment problem : less severe
Independent Detector	other flight crewa
Resolutory Action	flight crew : declared emergency flight crew : overcame equipment problem other
Consequence	Other
Supplementary
Primary Problem	Aircraft

Narrative:

At FL310 cruise confign with autoplt engaged, red low pressure elevator light began flashing on forward panel. Checked F/east position both B pump low pressure lights 'on' and B system fluid and quantity zero. Called for the 'loss of hydraulic pressure and/or fluid' checklist and accomplished it. Determined that brake system had not been affected and all hydraulic required systems were being powered by 'a' system. Notified approach control of our problem and requested emergency equipment standing by. Landed, taxied and secured without incident. Released emergency equipment after secured at gate. After maintenance check, found a 1 inch piece of 'B' return line had ruptured. Loss of 'B' fluid and pressure were immediate. 'B' line was replaced, pressure checked by maintenance. Aircraft continued without further problems.

Original NASA ASRS Text

Title: ACR LGT LOST ONE HYDRAULIC SYSTEM INFLT.

Narrative: AT FL310 CRUISE CONFIGN WITH AUTOPLT ENGAGED, RED LOW PRESSURE ELEVATOR LIGHT BEGAN FLASHING ON FORWARD PANEL. CHECKED F/E POSITION BOTH B PUMP LOW PRESSURE LIGHTS 'ON' AND B SYSTEM FLUID AND QUANTITY ZERO. CALLED FOR THE 'LOSS OF HYD PRESSURE AND/OR FLUID' CHECKLIST AND ACCOMPLISHED IT. DETERMINED THAT BRAKE SYSTEM HAD NOT BEEN AFFECTED AND ALL HYD REQUIRED SYSTEMS WERE BEING POWERED BY 'A' SYSTEM. NOTIFIED APCH CTL OF OUR PROBLEM AND REQUESTED EMER EQUIP STANDING BY. LANDED, TAXIED AND SECURED WITHOUT INCIDENT. RELEASED EMER EQUIP AFTER SECURED AT GATE. AFTER MAINT CHECK, FOUND A 1 INCH PIECE OF 'B' RETURN LINE HAD RUPTURED. LOSS OF 'B' FLUID AND PRESSURE WERE IMMEDIATE. 'B' LINE WAS REPLACED, PRESSURE CHECKED BY MAINT. ACFT CONTINUED WITHOUT FURTHER PROBLEMS.

Data retrieved from NASA's ASRS site as of August 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.