Engine failure causes aircraft to return to land.

Attributes
ACN	319524
Time
Date	199510
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : ord
State Reference	IL
Altitude	msl bound lower : 3500 msl bound upper : 3500
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tracon : ord tower : mia
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	climbout : intermediate altitude
Route In Use	departure sid : sid
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : cfi pilot : flight engineer
Experience	flight time last 90 days : 155 flight time total : 5050 flight time type : 1600
ASRS Report	319524
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : declared emergency none taken : unable
Consequence	Other
Supplementary
Primary Problem	Aircraft

Narrative:

On climb out from ohare international airport, en route on our scheduled air carrier flight to south bend, in, flight crew experienced a flickering #2 engine low oil pressure warning light, verified by the associated oil pressure gauge falling below 40 psid (the minimum for engine operation in this aircraft type -- bae ATP). Crew initiated memory items for engine shutdown, captain was the PNF. The shutdown checklist was followed and an emergency was declared with chicago departure, and vectors were swift in lining us up for a visual approach to runway 22L at ohare (wind 180 degrees 25 KTS gusting 29 KTS). Landing, rollout uneventful. (Captain flew aircraft.) upon maintenance investigation, it was revealed (at the time of this report), that either a compressor discharge pressure port valve stuck open, or the power section scavenge pump had failed, allowing oil not to be returned to the tank. I feel that the turbulence at the time, (strong south westerly winds up to 35 KTS) contributed to the initial flickering of the oil pressure warning prior to steady illumination.

Original NASA ASRS Text

Title: ENG FAILURE CAUSES ACFT TO RETURN TO LAND.

Narrative: ON CLBOUT FROM OHARE INTL ARPT, ENRTE ON OUR SCHEDULED ACR FLT TO S BEND, IN, FLC EXPERIENCED A FLICKERING #2 ENG LOW OIL PRESSURE WARNING LIGHT, VERIFIED BY THE ASSOCIATED OIL PRESSURE GAUGE FALLING BELOW 40 PSID (THE MINIMUM FOR ENG OP IN THIS ACFT TYPE -- BAE ATP). CREW INITIATED MEMORY ITEMS FOR ENG SHUTDOWN, CAPT WAS THE PNF. THE SHUTDOWN CHKLIST WAS FOLLOWED AND AN EMER WAS DECLARED WITH CHICAGO DEP, AND VECTORS WERE SWIFT IN LINING US UP FOR A VISUAL APCH TO RWY 22L AT OHARE (WIND 180 DEGS 25 KTS GUSTING 29 KTS). LNDG, ROLLOUT UNEVENTFUL. (CAPT FLEW ACFT.) UPON MAINT INVESTIGATION, IT WAS REVEALED (AT THE TIME OF THIS RPT), THAT EITHER A COMPRESSOR DISCHARGE PRESSURE PORT VALVE STUCK OPEN, OR THE PWR SECTION SCAVENGE PUMP HAD FAILED, ALLOWING OIL NOT TO BE RETURNED TO THE TANK. I FEEL THAT THE TURB AT THE TIME, (STRONG S WESTERLY WINDS UP TO 35 KTS) CONTRIBUTED TO THE INITIAL FLICKERING OF THE OIL PRESSURE WARNING PRIOR TO STEADY ILLUMINATION.

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.