MD80 crew had multiple engine stalls in cyyz class east airspace.

Attributes
ACN	570991
Time
Date	200211
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : yyz.airport
State Reference	ON
Altitude	msl single value : 12000
Environment
Weather Elements	Ice Snow
Aircraft 1
Controlling Facilities	artcc : czyz.artcc artcc : zzz.artcc
Operator	common carrier : air carrier
Make Model Name	MD-80 Super 80
Operating Under FAR Part	Part 121
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	570991
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
ASRS Report	570992
Events
Anomaly	aircraft equipment problem : critical inflight encounter : weather inflight encounter other other anomaly other
Independent Detector	other flight crewa other flight crewb
Resolutory Action	controller : issued new clearance controller : provided flight assist flight crew : landed in emergency condition flight crew : diverted to another airport flight crew : declared emergency other
Consequence	other other other
Supplementary
Problem Areas	Aircraft Weather
Primary Problem	Aircraft

Narrative:

Normal preflight and taxi procedures followed by deicing. Completed normal takeoff checklist. Waited for ATC departure release time. Normal takeoff and climb out. Normal checklist at 10000 ft. Passing 12000 ft, felt approximately 3 compressor stalls and heard and felt vibrations. All engine indications were normal. Reduced power and leveled at 12800 ft. Declared emergency, briefed flight attendants and passenger. Returned to yyz. Completed normal descent and landing checklists. Power was reduced and autothrottles were off as a result of the leveloff. Vibration went away when the power was reduced. Vibration returned on final when landing confign was accomplished. Landing was made by first officer so I (the captain) could watch for a possible engine failure of either engine. Tower and crash fire rescue equipment were notified of possible engine failure on final. Normal landing with medium autobrakes accomplished with idle reverse. Cleared runway. Crash fire rescue equipment said right engine was smoking. Secured right engine. Returned to gate on left engine. Postflt showed blades bent nose forward on right engine and circuit breaker for right engine, left side valve, anti-ice popped. Supplemental information from acn 570992: heard a muted pop with a continuous vibration. All engine indications normal after several seconds 2 or 3 pops in quick succession. At this point, I turned autothrottles off and reduced power. Vibration ceased at reduced power. Returned to field after declaring emergency. Accomplished normal checklist and procedures to a normal landing. During approach, vibration returned any time power exceeded 1.35 EPR. Cleared runway and stopped and had outside exterior inspection completed. Shut down right engine and taxied to the gate. Postflt showed fan blades bent on right engine. Found left anti-ice valve, right engine popped.

Original NASA ASRS Text

Title: MD80 CREW HAD MULTIPLE ENG STALLS IN CYYZ CLASS E AIRSPACE.

Narrative: NORMAL PREFLT AND TAXI PROCS FOLLOWED BY DEICING. COMPLETED NORMAL TKOF CHKLIST. WAITED FOR ATC DEP RELEASE TIME. NORMAL TKOF AND CLBOUT. NORMAL CHKLIST AT 10000 FT. PASSING 12000 FT, FELT APPROX 3 COMPRESSOR STALLS AND HEARD AND FELT VIBRATIONS. ALL ENG INDICATIONS WERE NORMAL. REDUCED PWR AND LEVELED AT 12800 FT. DECLARED EMER, BRIEFED FLT ATTENDANTS AND PAX. RETURNED TO YYZ. COMPLETED NORMAL DSCNT AND LNDG CHKLISTS. PWR WAS REDUCED AND AUTOTHROTTLES WERE OFF AS A RESULT OF THE LEVELOFF. VIBRATION WENT AWAY WHEN THE PWR WAS REDUCED. VIBRATION RETURNED ON FINAL WHEN LNDG CONFIGN WAS ACCOMPLISHED. LNDG WAS MADE BY FO SO I (THE CAPT) COULD WATCH FOR A POSSIBLE ENG FAILURE OF EITHER ENG. TWR AND CFR WERE NOTIFIED OF POSSIBLE ENG FAILURE ON FINAL. NORMAL LNDG WITH MEDIUM AUTOBRAKES ACCOMPLISHED WITH IDLE REVERSE. CLRED RWY. CFR SAID R ENG WAS SMOKING. SECURED R ENG. RETURNED TO GATE ON L ENG. POSTFLT SHOWED BLADES BENT NOSE FORWARD ON R ENG AND CIRCUIT BREAKER FOR R ENG, L SIDE VALVE, ANTI-ICE POPPED. SUPPLEMENTAL INFO FROM ACN 570992: HEARD A MUTED POP WITH A CONTINUOUS VIBRATION. ALL ENG INDICATIONS NORMAL AFTER SEVERAL SECONDS 2 OR 3 POPS IN QUICK SUCCESSION. AT THIS POINT, I TURNED AUTOTHROTTLES OFF AND REDUCED PWR. VIBRATION CEASED AT REDUCED PWR. RETURNED TO FIELD AFTER DECLARING EMER. ACCOMPLISHED NORMAL CHKLIST AND PROCS TO A NORMAL LNDG. DURING APCH, VIBRATION RETURNED ANY TIME PWR EXCEEDED 1.35 EPR. CLRED RWY AND STOPPED AND HAD OUTSIDE EXTERIOR INSPECTION COMPLETED. SHUT DOWN R ENG AND TAXIED TO THE GATE. POSTFLT SHOWED FAN BLADES BENT ON R ENG. FOUND L ANTI-ICE VALVE, R ENG POPPED.

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.