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A B767-200ER flight crew during climb from FL250 to FL350 noticed left engine oil pressure drop from 60 psi to 25 psi and quantity 4 to 5 qts low. Returned to departure airport. Found oil filler cap not secured.
| Attributes | |
| ACN | 707595 |
| Time | |
| Date | 200608 |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | msl single value : 35000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zzz.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B767-200 |
| 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 |
| ASRS Report | 707595 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | aircraft equipment problem : critical maintenance problem : improper maintenance maintenance problem : improper documentation non adherence : far non adherence : published procedure |
| Independent Detector | aircraft equipment other aircraft equipment : oil pressure other flight crewa other flight crewb |
| Resolutory Action | flight crew : diverted to another airport |
| Consequence | other other |
| Factors | |
| Maintenance | contributing factor : schedule pressure performance deficiency : logbook entry performance deficiency : non compliance with legal requirements performance deficiency : installation performance deficiency : inspection |
| Supplementary | |
| Problem Areas | Environmental Factor Maintenance Human Performance Aircraft |
| Primary Problem | Maintenance Human Performance |
Narrative:
During climb from 25000 ft to 35000 ft observed left engine oil pressure drop from 60 psi (normal range) to 25 psi (amber range). Oil temperature remained normal but quantity dropped 4 to 5 qts below the right engine quantity. (They were equal at departure.) no EICAS message was observed. Contacted dispatch and maintenance who observed the engine parameters through data link. We elected to return to ZZZ. Left engine oil pressure increased into the normal range during the descent but the quantity remained 4-5 qts low. Dispatch declared an emergency for us as we would be making an overweight landing. I did not exercise emergency authority/authorized and we landed uneventfully at ZZZ. Landing weight was 281000 pounds. After gate arrival and engine shutdown maintenance personnel opened the access door and observed that the left engine oil filler cap was not secured. Maintenance svced and ran the left engine; accomplished an overweight landing inspection and released the airplane. We continued with that aircraft.
Original NASA ASRS Text
Title: A B767-200ER FLT CREW DURING CLB FROM FL250 TO FL350 NOTICED L ENG OIL PRESSURE DROP FROM 60 PSI TO 25 PSI AND QUANTITY 4 TO 5 QTS LOW. RETURNED TO DEP ARPT. FOUND OIL FILLER CAP NOT SECURED.
Narrative: DURING CLB FROM 25000 FT TO 35000 FT OBSERVED L ENG OIL PRESSURE DROP FROM 60 PSI (NORMAL RANGE) TO 25 PSI (AMBER RANGE). OIL TEMP REMAINED NORMAL BUT QUANTITY DROPPED 4 TO 5 QTS BELOW THE R ENG QUANTITY. (THEY WERE EQUAL AT DEP.) NO EICAS MESSAGE WAS OBSERVED. CONTACTED DISPATCH AND MAINT WHO OBSERVED THE ENG PARAMETERS THROUGH DATA LINK. WE ELECTED TO RETURN TO ZZZ. L ENG OIL PRESSURE INCREASED INTO THE NORMAL RANGE DURING THE DSCNT BUT THE QUANTITY REMAINED 4-5 QTS LOW. DISPATCH DECLARED AN EMER FOR US AS WE WOULD BE MAKING AN OVERWT LNDG. I DID NOT EXERCISE EMER AUTH AND WE LANDED UNEVENTFULLY AT ZZZ. LNDG WT WAS 281000 LBS. AFTER GATE ARR AND ENG SHUTDOWN MAINT PERSONNEL OPENED THE ACCESS DOOR AND OBSERVED THAT THE L ENG OIL FILLER CAP WAS NOT SECURED. MAINT SVCED AND RAN THE L ENG; ACCOMPLISHED AN OVERWT LNDG INSPECTION AND RELEASED THE AIRPLANE. WE CONTINUED WITH THAT ACFT.
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.