A320 flight crew reports compressor stall at FL360 followed shortly by engine oil filter clog ECAM. ...

Attributes
ACN	748496
Time
Date	200708
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	msl single value : 36000
Environment
Flight Conditions	VMC
Aircraft 1
Controlling Facilities	artcc : zzz.artcc
Operator	common carrier : air carrier
Make Model Name	A320
Operating Under FAR Part	Part 121
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Experience	flight time last 90 days : 240 flight time total : 23000 flight time type : 6500
ASRS Report	748496
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Experience	flight time last 90 days : 230 flight time total : 5500 flight time type : 3000
ASRS Report	748497
Events
Anomaly	aircraft equipment problem : critical other anomaly
Independent Detector	aircraft equipment other aircraft equipment : ecam other flight crewa other flight crewb
Resolutory Action	controller : issued new clearance flight crew : diverted to another airport flight crew : landed in emergency condition flight crew : declared emergency
Consequence	other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

We were established in cruise approximately 80 mi west of ZZZ when we experienced a muffled bang with associated yaw. We realized we had a compressor stall on #2 engine with an engine stall ECAM. EPR decreased and returned to normal. Approximately 10 seconds later received engine #2 oil filter clog on ECAM. Flight attendants called from cabin with concerns of loud noise and associated smell and haze in cabin. We then reduced #2 engine to idle; shut off engine #2 bleed; xbleed valve open; recirculation fans off with associated pack high flow. Requested first officer to do ECAM while I flew plane and took care of radio work. He did engine stall and engine oil filter clog ECAM with reference to flight manual. Declared emergency and asked for clearance to ZZZ. This was most suitable airport in point of time. Maintained #2 engine at idle thrust as all parameters were normal; engine #2 oil filter clog stayed on continuously. Advised dispatch of emergency and checked with flight attendant that cabin air quality was now normal and it was. Planned cabin advisory and indicated we had 20 mins to touchdown. Then made announcement to passenger of our problem and plan. Proceeded to ZZZ and made normal approach and landing. Shut down #2 engine after departing arrival runway. Emergency equipment inspected engine and indicated smoke from engine as we turned off runway. Dissipated quickly after engine shut down. Taxied to gate to deplaned passenger. All indications normal as we taxied back to gate. Callback conversation with reporter revealed the following information: post flight inspection by maintenance revealed that the oil filter was clogged with metal fragments although the engine continued to run after landing and rotate freely after shut down. Exactly how the compressor stall and the metal fragments are related is unknown. The V2500 engine was replaced before the aircraft was released for flight.

Original NASA ASRS Text

Title: A320 FLT CREW REPORTS COMPRESSOR STALL AT FL360 FOLLOWED SHORTLY BY ENG OIL FILTER CLOG ECAM. EMERGENCY IS DECLARED AND FLIGHT DIVERTS TO NEAREST SUITABLE ARPT WITH ENGINE AT IDLE.

Narrative: WE WERE ESTABLISHED IN CRUISE APPROX 80 MI W OF ZZZ WHEN WE EXPERIENCED A MUFFLED BANG WITH ASSOCIATED YAW. WE REALIZED WE HAD A COMPRESSOR STALL ON #2 ENG WITH AN ENG STALL ECAM. EPR DECREASED AND RETURNED TO NORMAL. APPROX 10 SECONDS LATER RECEIVED ENG #2 OIL FILTER CLOG ON ECAM. FLT ATTENDANTS CALLED FROM CABIN WITH CONCERNS OF LOUD NOISE AND ASSOCIATED SMELL AND HAZE IN CABIN. WE THEN REDUCED #2 ENG TO IDLE; SHUT OFF ENG #2 BLEED; XBLEED VALVE OPEN; RECIRCULATION FANS OFF WITH ASSOCIATED PACK HIGH FLOW. REQUESTED FO TO DO ECAM WHILE I FLEW PLANE AND TOOK CARE OF RADIO WORK. HE DID ENG STALL AND ENG OIL FILTER CLOG ECAM WITH REF TO FLT MANUAL. DECLARED EMER AND ASKED FOR CLRNC TO ZZZ. THIS WAS MOST SUITABLE ARPT IN POINT OF TIME. MAINTAINED #2 ENG AT IDLE THRUST AS ALL PARAMETERS WERE NORMAL; ENG #2 OIL FILTER CLOG STAYED ON CONTINUOUSLY. ADVISED DISPATCH OF EMER AND CHKED WITH FLT ATTENDANT THAT CABIN AIR QUALITY WAS NOW NORMAL AND IT WAS. PLANNED CABIN ADVISORY AND INDICATED WE HAD 20 MINS TO TOUCHDOWN. THEN MADE ANNOUNCEMENT TO PAX OF OUR PROB AND PLAN. PROCEEDED TO ZZZ AND MADE NORMAL APCH AND LNDG. SHUT DOWN #2 ENG AFTER DEPARTING ARR RWY. EMER EQUIP INSPECTED ENG AND INDICATED SMOKE FROM ENG AS WE TURNED OFF RWY. DISSIPATED QUICKLY AFTER ENG SHUT DOWN. TAXIED TO GATE TO DEPLANED PAX. ALL INDICATIONS NORMAL AS WE TAXIED BACK TO GATE. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: POST FLIGHT INSPECTION BY MAINTENANCE REVEALED THAT THE OIL FILTER WAS CLOGGED WITH METAL FRAGMENTS ALTHOUGH THE ENGINE CONTINUED TO RUN AFTER LANDING AND ROTATE FREELY AFTER SHUT DOWN. EXACTLY HOW THE COMPRESSOR STALL AND THE METAL FRAGMENTS ARE RELATED IS UNKNOWN. THE V2500 ENGINE WAS REPLACED BEFORE THE ACFT WAS RELEASED FOR FLIGHT.

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.

A320 flight crew reports compressor stall at FL360 followed shortly by engine oil filter clog ECAM. Emergency is declared and flight diverts to nearest suitable airport with engine at idle.