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B767-300 flight crew notices reduction in hydraulic quantity; flight is diverted when leak cannot be contained.
| Attributes | |
| ACN | 699199 |
| Time | |
| Date | 200606 |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : ord.airport |
| State Reference | IL |
| Altitude | msl single value : 37000 |
| Environment | |
| Flight Conditions | VMC |
| Aircraft 1 | |
| Controlling Facilities | artcc : zau.artcc tower : ord.tower |
| Make Model Name | B767-300 and 300 ER |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Experience | flight time last 90 days : 240 flight time total : 14000 flight time type : 6000 |
| ASRS Report | 699199 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | aircraft equipment problem : critical |
| Independent Detector | aircraft equipment other aircraft equipment : eicas other flight crewa other flight crewb other controllera |
| Resolutory Action | flight crew : diverted to another airport |
| Consequence | other |
| Supplementary | |
| Problem Areas | Aircraft |
| Primary Problem | Aircraft |
Narrative:
Established in cruise; I elected to retrim the aircraft. Bringing up the status page; I noticed the center hydraulic quantity RF symbol and a quantity reading of .55. We monitored the quantity and noted a .01 drop every 3/4 mins. We established contact with dispatch and maintenance. Since we were only 50 mi past ord; we decided to divert to ord. Before we turned maintenance suggested we try turning off the #1 center electric pump. This seemed to stop the leak. We decided to continue to bos and monitor the reading. After 15 mins; it was determined the leak had returned and the source was not the pump. Bos WX was heavy rain and 25 KT winds. We turned back to ord. The following checklists were accomplished or reviewed: low hydraulic quantity; center system pressure loss; alternate gear and flap operation. A cabin advisory was established and PA announcement made. Gear and flaps 20 degrees were established early and the hydraulic system worked normally although the quantity reached .12. Reserve brakes and steering switch was pushed to ensure steering. Landing and taxi to the gate were normal.
Original NASA ASRS Text
Title: B767-300 FLT CREW NOTICES REDUCTION IN HYD QUANTITY; FLT IS DIVERTED WHEN LEAK CANNOT BE CONTAINED.
Narrative: ESTABLISHED IN CRUISE; I ELECTED TO RETRIM THE ACFT. BRINGING UP THE STATUS PAGE; I NOTICED THE CTR HYD QUANTITY RF SYMBOL AND A QUANTITY READING OF .55. WE MONITORED THE QUANTITY AND NOTED A .01 DROP EVERY 3/4 MINS. WE ESTABLISHED CONTACT WITH DISPATCH AND MAINT. SINCE WE WERE ONLY 50 MI PAST ORD; WE DECIDED TO DIVERT TO ORD. BEFORE WE TURNED MAINT SUGGESTED WE TRY TURNING OFF THE #1 CTR ELECTRIC PUMP. THIS SEEMED TO STOP THE LEAK. WE DECIDED TO CONTINUE TO BOS AND MONITOR THE READING. AFTER 15 MINS; IT WAS DETERMINED THE LEAK HAD RETURNED AND THE SOURCE WAS NOT THE PUMP. BOS WX WAS HVY RAIN AND 25 KT WINDS. WE TURNED BACK TO ORD. THE FOLLOWING CHKLISTS WERE ACCOMPLISHED OR REVIEWED: LOW HYD QUANTITY; CTR SYS PRESSURE LOSS; ALTERNATE GEAR AND FLAP OP. A CABIN ADVISORY WAS ESTABLISHED AND PA ANNOUNCEMENT MADE. GEAR AND FLAPS 20 DEGS WERE ESTABLISHED EARLY AND THE HYD SYS WORKED NORMALLY ALTHOUGH THE QUANTITY REACHED .12. RESERVE BRAKES AND STEERING SWITCH WAS PUSHED TO ENSURE STEERING. LNDG AND TAXI TO THE GATE WERE NORMAL.
Data retrieved from NASA's ASRS site as of January 2009 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.