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A B747-200 in cruise FL390 diverted due to loss of #1 engine oil pressure and quantity. The cause unknown but engine was replaced.
| Attributes | |
| ACN | 474506 |
| Time | |
| Date | 200005 |
| Day | Thu |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : hnl.airport |
| State Reference | HI |
| Altitude | msl single value : 39000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zoa.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B747-200 |
| Operating Under FAR Part | Part 91 |
| Navigation In Use | other |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : cfi pilot : flight engineer pilot : atp |
| Experience | flight time last 90 days : 100 flight time total : 15000 flight time type : 5000 |
| ASRS Report | 474506 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : multi engine pilot : commercial pilot : instrument |
| Events | |
| Anomaly | aircraft equipment problem : critical other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : #1 eng iol indications other flight crewa other flight crewb |
| Resolutory Action | flight crew : diverted to another airport |
| Consequence | other |
| Supplementary | |
| Problem Areas | Aircraft |
| Primary Problem | Aircraft |
Narrative:
During cruise, about 1 hour 45 mins after takeoff, we noticed engine #1 oil pressure light on forward instrument panel flickering intermittently. Checked so oil pressure gauge -- it too was erratic, fluctuating in the 'yellow band' from 35-40 psi. Checked the oil quantity gauge and it read zero. Retarded #1 throttle lever to idle. #1 oil pressure was now steady. Ran precautionary shutdown checklist. Coordinated a lower altitude with ATC. Coordinated a divert to sea with msp dispatch. Diverted to sea without further incident. Callback conversation with reporter revealed the following information: the reporter stated the airplane was diverted to sea where it was worked on for about 3 hours replacing a rear engine seal. The reporter said on taxi out from sea the oil was again lost. The airplane was then ferried to an overhaul base on 3 engines and #1 engine was replaced.
Original NASA ASRS Text
Title: A B747-200 IN CRUISE FL390 DIVERTED DUE TO LOSS OF #1 ENG OIL PRESSURE AND QUANTITY. THE CAUSE UNKNOWN BUT ENG WAS REPLACED.
Narrative: DURING CRUISE, ABOUT 1 HR 45 MINS AFTER TKOF, WE NOTICED ENG #1 OIL PRESSURE LIGHT ON FORWARD INST PANEL FLICKERING INTERMITTENTLY. CHKED SO OIL PRESSURE GAUGE -- IT TOO WAS ERRATIC, FLUCTUATING IN THE 'YELLOW BAND' FROM 35-40 PSI. CHKED THE OIL QUANTITY GAUGE AND IT READ ZERO. RETARDED #1 THROTTLE LEVER TO IDLE. #1 OIL PRESSURE WAS NOW STEADY. RAN PRECAUTIONARY SHUTDOWN CHKLIST. COORDINATED A LOWER ALT WITH ATC. COORDINATED A DIVERT TO SEA WITH MSP DISPATCH. DIVERTED TO SEA WITHOUT FURTHER INCIDENT. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE AIRPLANE WAS DIVERTED TO SEA WHERE IT WAS WORKED ON FOR ABOUT 3 HRS REPLACING A REAR ENG SEAL. THE RPTR SAID ON TAXI OUT FROM SEA THE OIL WAS AGAIN LOST. THE AIRPLANE WAS THEN FERRIED TO AN OVERHAUL BASE ON 3 ENGS AND #1 ENG WAS REPLACED.
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.