B757-200 flight crew got master caution; left oil bypass. Diversion completed.

Attributes
ACN	690789
Time
Date	200603
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	msl single value : 37000
Aircraft 1
Controlling Facilities	artcc : zzz.artcc
Operator	common carrier : air carrier
Make Model Name	B757-200
Operating Under FAR Part	Part 121
Flight Phase	cruise : level
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Experience	flight time last 90 days : 240 flight time total : 12000 flight time type : 1300
ASRS Report	690789
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	other flight crewa other flight crewb
Resolutory Action	flight crew : diverted to another airport
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

At cruise altitude; got master caution left oil filter bypass. Talked with maintenance and dispatch. Completed all checklists and made uneventful single engine landing.

Original NASA ASRS Text

Title: B757-200 FLT CREW GOT MASTER CAUTION; L OIL BYPASS. DIVERSION COMPLETED.

Narrative: AT CRUISE ALT; GOT MASTER CAUTION L OIL FILTER BYPASS. TALKED WITH MAINT AND DISPATCH. COMPLETED ALL CHKLISTS AND MADE UNEVENTFUL SINGLE ENG LNDG.

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.