Narrative:

Aircraft had overnighted ZZZ with a service being performed, inbound flight xa. 26 hours later, aircraft delivered to gate for outbound flight xb with open system maintenance controller request for oil service both engines. Mechanic called me and indicated he had put 4 quarts oil in #2 engine and plane oil had automatic calculated that #2 engine serial abcd had went red flag to oil consumption problem. After discussing with mechanic, I assumed we had double svced #2 engine. This assumption was based on past experience with long aircraft stays ZZZ and this happening before. Also a thorough review of plane oil was done from apr/2000 to may/2000 and engine only consuming about .20 an hour. I then called system maintenance wxwwy an engine maintenance controller while the mechanics checked #2 engine per maintenance manual. Wxwwy and I agreed that this engine showed no evidence of having oil consumption problems, nothing was found by the mechanics. Wxwwy then instructed me to change the oil service that the mechanic had entered as 4 quarts to 2 quarts and use my number to make this entry. This took consumption rate .86 to .21 acceptable limit. I then concurred with mechanics again that nothing had been found when #2 was opened and inspected per maintenance manual. I signed off item sequence #zyxx and released aircraft. I feel that after dispatching aircraft and even though oil consumption was under and condition per stated maintenance manual for a deferral out of ETOPS, it would have been safer to make a deferral non ETOPS for a few legs to make certain consumption levels checked good. The oil consumption as of may/00 is at .21 quarts per hour. I should have insisted on a deferral to check engine and correct first available maintenance opportunity.

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Original NASA ASRS Text

Title: A B757-200 WITH POSSIBLE #2 ENG HIGH OIL CONSUMPTION IS DISPATCHED OVERWATER WITH NO DEFERRED ITEM FOR RECHK OF OIL CONSUMPTION.

Narrative: ACFT HAD OVERNIGHTED ZZZ WITH A SVC BEING PERFORMED, INBOUND FLT XA. 26 HRS LATER, ACFT DELIVERED TO GATE FOR OUTBOUND FLT XB WITH OPEN SYS MAINT CTLR REQUEST FOR OIL SVC BOTH ENGS. MECH CALLED ME AND INDICATED HE HAD PUT 4 QUARTS OIL IN #2 ENG AND PLANE OIL HAD AUTO CALCULATED THAT #2 ENG SERIAL ABCD HAD WENT RED FLAG TO OIL CONSUMPTION PROB. AFTER DISCUSSING WITH MECH, I ASSUMED WE HAD DOUBLE SVCED #2 ENG. THIS ASSUMPTION WAS BASED ON PAST EXPERIENCE WITH LONG ACFT STAYS ZZZ AND THIS HAPPENING BEFORE. ALSO A THOROUGH REVIEW OF PLANE OIL WAS DONE FROM APR/2000 TO MAY/2000 AND ENG ONLY CONSUMING ABOUT .20 AN HR. I THEN CALLED SYS MAINT WXWWY AN ENG MAINT CTLR WHILE THE MECHS CHKED #2 ENG PER MAINT MANUAL. WXWWY AND I AGREED THAT THIS ENG SHOWED NO EVIDENCE OF HAVING OIL CONSUMPTION PROBS, NOTHING WAS FOUND BY THE MECHS. WXWWY THEN INSTRUCTED ME TO CHANGE THE OIL SVC THAT THE MECH HAD ENTERED AS 4 QUARTS TO 2 QUARTS AND USE MY NUMBER TO MAKE THIS ENTRY. THIS TOOK CONSUMPTION RATE .86 TO .21 ACCEPTABLE LIMIT. I THEN CONCURRED WITH MECHS AGAIN THAT NOTHING HAD BEEN FOUND WHEN #2 WAS OPENED AND INSPECTED PER MAINT MANUAL. I SIGNED OFF ITEM SEQUENCE #ZYXX AND RELEASED ACFT. I FEEL THAT AFTER DISPATCHING ACFT AND EVEN THOUGH OIL CONSUMPTION WAS UNDER AND CONDITION PER STATED MAINT MANUAL FOR A DEFERRAL OUT OF ETOPS, IT WOULD HAVE BEEN SAFER TO MAKE A DEFERRAL NON ETOPS FOR A FEW LEGS TO MAKE CERTAIN CONSUMPTION LEVELS CHKED GOOD. THE OIL CONSUMPTION AS OF MAY/00 IS AT .21 QUARTS PER HR. I SHOULD HAVE INSISTED ON A DEFERRAL TO CHK ENG AND CORRECT FIRST AVAILABLE MAINT OPPORTUNITY.

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.