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A B757-200 in climb at FL190 diverted due to loss of left hydraulic system pressure and quantity. Caused by a failed pressure line on the left main landing gear.
| Attributes | |
| ACN | 598009 |
| Time | |
| Date | 200310 |
| Day | Tue |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | navaid : zzz.vor |
| State Reference | US |
| Altitude | msl single value : 19000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zzz.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B757 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other other vortac |
| Flight Phase | climbout : intermediate altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 20000 flight time type : 2000 |
| ASRS Report | 598009 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : multi engine pilot : instrument pilot : cfi pilot : atp |
| Experience | flight time last 90 days : 240 flight time total : 21400 flight time type : 8800 |
| ASRS Report | 598311 |
| Events | |
| Anomaly | aircraft equipment problem : critical other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : eicas warning 'hyd qty' other flight crewa other flight crewb |
| Resolutory Action | flight crew : diverted to another airport |
| Consequence | other |
| Supplementary | |
| Problem Areas | Airport Chart Or Publication Flight Crew Human Performance Aircraft |
| Primary Problem | Aircraft |
Narrative:
During climb, EICAS annunciated 'left hydraulic quantity' with associated 'reservoir' light. Status page displayed left hydraulic quantity 0.43 RF. Referenced QRH, notified company and requested from ATC return to ZZZ due to possible loss of 'a' hydraulic system. System quantity continued to decline to 0.24. When abeam ZZZ, extended gear normally. During flap extension, EICAS displayed 'left hydraulic engine pump' and associated 'low pressure' light illuminated. Referenced QRH, loss of left hydraulic system, advised ATC, flight attendants, and passenger of diversion to ZZZ1 due to longer runway lengths available per agreement with dispatcher. Landed runway 9R ZZZ1, taxied clear of runway end, and was towed to the gate. Callback conversation with reporter revealed the following information: the reporter stated the pressure line location and function that failed in the left system is unknown. The reporter said maintenance only revealed a pressure line failed. The reporter stated no emergency was declared. Callback conversation with reporter acn #598311 revealed the following information: the reporter stated the loss of the left hydraulic system fluid was caused by a flexible hydraulic line on the left main landing gear. The reporter said the left main landing gear was completely wet from the fluid and suspects the line was a brake pressure line.
Original NASA ASRS Text
Title: A B757-200 IN CLB AT FL190 DIVERTED DUE TO LOSS OF L HYD SYS PRESSURE AND QUANTITY. CAUSED BY A FAILED PRESSURE LINE ON THE L MAIN LNDG GEAR.
Narrative: DURING CLB, EICAS ANNUNCIATED 'L HYD QUANTITY' WITH ASSOCIATED 'RESERVOIR' LIGHT. STATUS PAGE DISPLAYED L HYD QUANTITY 0.43 RF. REFED QRH, NOTIFIED COMPANY AND REQUESTED FROM ATC RETURN TO ZZZ DUE TO POSSIBLE LOSS OF 'A' HYD SYS. SYS QUANTITY CONTINUED TO DECLINE TO 0.24. WHEN ABEAM ZZZ, EXTENDED GEAR NORMALLY. DURING FLAP EXTENSION, EICAS DISPLAYED 'L HYD ENG PUMP' AND ASSOCIATED 'LOW PRESSURE' LIGHT ILLUMINATED. REFED QRH, LOSS OF L HYD SYS, ADVISED ATC, FLT ATTENDANTS, AND PAX OF DIVERSION TO ZZZ1 DUE TO LONGER RWY LENGTHS AVAILABLE PER AGREEMENT WITH DISPATCHER. LANDED RWY 9R ZZZ1, TAXIED CLR OF RWY END, AND WAS TOWED TO THE GATE. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE PRESSURE LINE LOCATION AND FUNCTION THAT FAILED IN THE L SYS IS UNKNOWN. THE RPTR SAID MAINT ONLY REVEALED A PRESSURE LINE FAILED. THE RPTR STATED NO EMER WAS DECLARED. CALLBACK CONVERSATION WITH RPTR ACN #598311 REVEALED THE FOLLOWING INFO: THE RPTR STATED THE LOSS OF THE L HYD SYS FLUID WAS CAUSED BY A FLEXIBLE HYD LINE ON THE L MAIN LNDG GEAR. THE RPTR SAID THE L MAIN LNDG GEAR WAS COMPLETELY WET FROM THE FLUID AND SUSPECTS THE LINE WAS A BRAKE PRESSURE LINE.
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.