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B737-300 experienced hydraulic 'a' quantity loss during cruise. Flight diverted for precautionary landing.
| Attributes | |
| ACN | 769447 |
| Time | |
| Date | 200801 |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | msl single value : 36000 |
| Environment | |
| Flight Conditions | VMC |
| Aircraft 1 | |
| Controlling Facilities | artcc : zzz.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B737-300 |
| 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 : 230 flight time total : 9500 flight time type : 3500 |
| ASRS Report | 769447 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Experience | flight time last 90 days : 230 flight time total : 5600 flight time type : 1300 |
| ASRS Report | 769446 |
| Events | |
| Anomaly | aircraft equipment problem : critical |
| Independent Detector | other flight crewa other flight crewb |
| Resolutory Action | flight crew : diverted to another airport flight crew : landed as precaution |
| Supplementary | |
| Problem Areas | Aircraft |
| Primary Problem | Aircraft |
Narrative:
Normal takeoff climb and cruise for 1 hour 45 mins. About 60 mi west of ZZZ the hydraulic system 'a' quantity indicator decreased to 1/4. We called dispatch and had a phone patch to maintenance. Maintenance asked if any other lights; such as low pressure or overheat were on. There were no other indications; so maintenance declared we had a gauge problem. Captain disagreed but they stuck by their assessment and directed us to proceed to destination. About 15 mins later the low pressure light came on and the hydraulic system 'a' quantity continued to decrease below 1/4. We had flown another 100 mi. We completed all checklist items; turned around; and diverted to ZZZ. Landing was without incident and we towed back to gate.
Original NASA ASRS Text
Title: B737-300 EXPERIENCED HYD 'A' QUANTITY LOSS DURING CRUISE. FLT DIVERTED FOR PRECAUTIONARY LNDG.
Narrative: NORMAL TKOF CLB AND CRUISE FOR 1 HR 45 MINS. ABOUT 60 MI W OF ZZZ THE HYD SYS 'A' QUANTITY INDICATOR DECREASED TO 1/4. WE CALLED DISPATCH AND HAD A PHONE PATCH TO MAINT. MAINT ASKED IF ANY OTHER LIGHTS; SUCH AS LOW PRESSURE OR OVERHEAT WERE ON. THERE WERE NO OTHER INDICATIONS; SO MAINT DECLARED WE HAD A GAUGE PROB. CAPT DISAGREED BUT THEY STUCK BY THEIR ASSESSMENT AND DIRECTED US TO PROCEED TO DEST. ABOUT 15 MINS LATER THE LOW PRESSURE LIGHT CAME ON AND THE HYD SYS 'A' QUANTITY CONTINUED TO DECREASE BELOW 1/4. WE HAD FLOWN ANOTHER 100 MI. WE COMPLETED ALL CHKLIST ITEMS; TURNED AROUND; AND DIVERTED TO ZZZ. LNDG WAS WITHOUT INCIDENT AND WE TOWED BACK TO GATE.
Data retrieved from NASA's ASRS site as of May 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.