Filter replaced by contract technician. Leak checked ok with engine run. At FL330 #2 engine lost oil quantity and pressure. Emergency declared. Diverted to ZZZ3. Found filter seal cut.

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Attributes
ACN	693149
Time
Date	200604
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	msl single value : 33000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zzz.artcc
Operator	common carrier : air carrier
Make Model Name	MD-80 Series (DC-9-80) Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	climbout : initial
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
ASRS Report	693149
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
ASRS Report	693150
Events
Anomaly	aircraft equipment problem : critical maintenance problem : improper maintenance non adherence : published procedure non adherence : far
Independent Detector	aircraft equipment other aircraft equipment : eng low press and qty warning other flight crewa other flight crewb
Resolutory Action	flight crew : diverted to another airport flight crew : declared emergency
Consequence	other other
Factors
Maintenance	performance deficiency : inspection performance deficiency : installation performance deficiency : non compliance with legal requirements performance deficiency : testing
Supplementary
Problem Areas	Maintenance Human Performance Chart Or Publication Aircraft Flight Crew Human Performance
Primary Problem	Maintenance Human Performance

Narrative:

We got a right engine oil strainer caution going into ZZZ1. Had the filter changed by contract maintenance and performed engine run-up/leak check -- all looked good. Next leg to ZZZ2 during final climb; the right engine oil pressure low caution light illuminated with a simultaneous loss of all fluid and pressure. We were 90 mi from ZZZ3 so declared an emergency and diverted there. We kept the right engine at idle and monitored per operating manual. Mechanic in ZZZ3 informed us that it's very easy to cut the new o-ring during installation of the filter so they normally just leave the old one on place. This might be good information for contract maintenance filter changes.

Original NASA ASRS Text

Title: FILTER REPLACED BY CONTRACT TECHNICIAN. LEAK CHKED OK WITH ENG RUN. AT FL330 #2 ENG LOST OIL QUANTITY AND PRESSURE. EMER DECLARED. DIVERTED TO ZZZ3. FOUND FILTER SEAL CUT.

Narrative: WE GOT A R ENG OIL STRAINER CAUTION GOING INTO ZZZ1. HAD THE FILTER CHANGED BY CONTRACT MAINT AND PERFORMED ENG RUN-UP/LEAK CHK -- ALL LOOKED GOOD. NEXT LEG TO ZZZ2 DURING FINAL CLB; THE R ENG OIL PRESSURE LOW CAUTION LIGHT ILLUMINATED WITH A SIMULTANEOUS LOSS OF ALL FLUID AND PRESSURE. WE WERE 90 MI FROM ZZZ3 SO DECLARED AN EMER AND DIVERTED THERE. WE KEPT THE R ENG AT IDLE AND MONITORED PER OPERATING MANUAL. MECH IN ZZZ3 INFORMED US THAT IT'S VERY EASY TO CUT THE NEW O-RING DURING INSTALLATION OF THE FILTER SO THEY NORMALLY JUST LEAVE THE OLD ONE ON PLACE. THIS MIGHT BE GOOD INFO FOR CONTRACT MAINT FILTER CHANGES.

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.