<< >> NASA ASRS Report 784560, April 2008

B737-300 lost oil pressure on #2 engine during cruise. Engine was shut down; emergency was declared; and the flight crew diverted to departure airport.

Attributes
ACN	784560
Time
Date	200804
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	msl single value : 35000
Aircraft 1
Controlling Facilities	artcc : zzz.artcc tower : zzz.tower
Operator	common carrier : air carrier
Make Model Name	B737-300
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
Experience	flight time last 90 days : 200 flight time total : 15000 flight time type : 3000
ASRS Report	784560
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Experience	flight time last 90 days : 160 flight time total : 10500 flight time type : 7500
ASRS Report	784563
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	aircraft equipment other aircraft equipment : master caution
Resolutory Action	flight crew : declared emergency flight crew : diverted to another airport flight crew : landed in emergency condition
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

I was the captain flying. Level at FL350; I noticed the engine #2 low oil pressure light flash. The oil quantity was indicating 6%. At first glance; the oil pressure gauge was slightly above red line and decreasing. We ran the checklist for engine oil pressure low. The engine was shut down as per the checklist. We referred to the drift-down and in-flight engine failure irregular procedure checklists. We called dispatch and maintenance to discuss the problem and coordination our return to ZZZ. Just prior to shutdown; the oil pressure gauge was indicating just below red line but not at 0. We were about 140 mi east of ZZZ and with ZZZ being the closest suitable airport; we turned around and returned. An emergency was declared with ATC. No other problems occurred and the return was uneventful. ATC was a great help in clearing us to lower altitudes and an expeditious return to the field.

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Original NASA ASRS Text

Title: B737-300 LOST OIL PRESSURE ON #2 ENG DURING CRUISE. ENG WAS SHUT DOWN; EMER WAS DECLARED; AND THE FLT CREW DIVERTED TO DEP ARPT.

Narrative: I WAS THE CAPT FLYING. LEVEL AT FL350; I NOTICED THE ENG #2 LOW OIL PRESSURE LIGHT FLASH. THE OIL QUANTITY WAS INDICATING 6%. AT FIRST GLANCE; THE OIL PRESSURE GAUGE WAS SLIGHTLY ABOVE RED LINE AND DECREASING. WE RAN THE CHKLIST FOR ENG OIL PRESSURE LOW. THE ENG WAS SHUT DOWN AS PER THE CHKLIST. WE REFERRED TO THE DRIFT-DOWN AND INFLT ENG FAILURE IRREGULAR PROC CHKLISTS. WE CALLED DISPATCH AND MAINT TO DISCUSS THE PROB AND COORD OUR RETURN TO ZZZ. JUST PRIOR TO SHUTDOWN; THE OIL PRESSURE GAUGE WAS INDICATING JUST BELOW RED LINE BUT NOT AT 0. WE WERE ABOUT 140 MI E OF ZZZ AND WITH ZZZ BEING THE CLOSEST SUITABLE ARPT; WE TURNED AROUND AND RETURNED. AN EMER WAS DECLARED WITH ATC. NO OTHER PROBS OCCURRED AND THE RETURN WAS UNEVENTFUL. ATC WAS A GREAT HELP IN CLRING US TO LOWER ALTS AND AN EXPEDITIOUS RETURN TO THE FIELD.

Data retrieved from NASA's ASRS site as of May 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.