An air carrier MD80 flight was aborted due to noise, EPR fluctuation, and yaw, during takeoff roll. ...

Narrative:

Before the flight from yyc to ord the ground service crew towed aircraft to the gate from its overnight pad. The aircraft had ice on the wings so we informed the crew we would need to be deiced. The WX was clear with a temperature of 3 degrees C. We started the engines at the gate and applied engine anti-ice. We then prepared the aircraft for deicing which appeared to take place normally. After deicing we taxied to runway 34 with no delays and were cleared for an immediate takeoff. It was my takeoff and we were making a maximum power takeoff. I advanced power to 1.4 EPR and called autothrottles, which the captain activated. Acceleration was normal until about 80 KTS when I noticed a muffled noise and the aircraft yawed slightly right. I glanced once more at the airspeed and saw 90 KTS and then focused my attention back outside. The aircraft yawed right once more and the captain initiated the abort between 90-100 KTS. We returned to the gate and left the flaps extended so an inspection could be made to insure there was no damage to the flaps. Upon inspection of the right engine, a number of fan blades were bent out of shape. Contract maintenance informed us that the fan would have to be changed if not the whole engine. Upon inspecting the wings no damage was found, but there was ice on the wings just aft of the heater blankets and on the leading edges of the flaps. Supplemental information from acn 324727: aircraft commenced takeoff roll on runway 34 using maximum power due to having been deiced at gate. At approximately 80-90 KTS I noticed the right EPR fluctuate and felt aircraft pull slightly to right. I initiated an abort without incident and cleared runway. After arrival at gate I and the first officer along with maintenance, observed several bent blades on the foremost compressor blade. We also observed several small spots of ice on the aft part of the right wing. It is unlikely this was picked up during taxi or even during the abort as the WX conditions were clear and the runway was also basically free of contaminants. This leads me to believe that the aircraft was not properly deiced to begin with.

Original NASA ASRS Text

Title: AN ACR MD80 FLT WAS ABORTED DUE TO NOISE, EPR FLUCTUATION, AND YAW, DURING TKOF ROLL. POSTFLT INSPECTION REVEALED BENT FAN BLADES ON THE R ENG, AND ICE ON THE WINGS AND LEADING EDGES OF THE FLAPS. THE CAPT BELIEVES THAT THE ACFT WAS NOT PROPERLY DEICED.

Narrative: BEFORE THE FLT FROM YYC TO ORD THE GND SVC CREW TOWED ACFT TO THE GATE FROM ITS OVERNIGHT PAD. THE ACFT HAD ICE ON THE WINGS SO WE INFORMED THE CREW WE WOULD NEED TO BE DEICED. THE WX WAS CLR WITH A TEMP OF 3 DEGS C. WE STARTED THE ENGS AT THE GATE AND APPLIED ENG ANTI-ICE. WE THEN PREPARED THE ACFT FOR DEICING WHICH APPEARED TO TAKE PLACE NORMALLY. AFTER DEICING WE TAXIED TO RWY 34 WITH NO DELAYS AND WERE CLRED FOR AN IMMEDIATE TKOF. IT WAS MY TKOF AND WE WERE MAKING A MAX PWR TKOF. I ADVANCED PWR TO 1.4 EPR AND CALLED AUTOTHROTTLES, WHICH THE CAPT ACTIVATED. ACCELERATION WAS NORMAL UNTIL ABOUT 80 KTS WHEN I NOTICED A MUFFLED NOISE AND THE ACFT YAWED SLIGHTLY R. I GLANCED ONCE MORE AT THE AIRSPD AND SAW 90 KTS AND THEN FOCUSED MY ATTN BACK OUTSIDE. THE ACFT YAWED R ONCE MORE AND THE CAPT INITIATED THE ABORT BTWN 90-100 KTS. WE RETURNED TO THE GATE AND LEFT THE FLAPS EXTENDED SO AN INSPECTION COULD BE MADE TO INSURE THERE WAS NO DAMAGE TO THE FLAPS. UPON INSPECTION OF THE R ENG, A NUMBER OF FAN BLADES WERE BENT OUT OF SHAPE. CONTRACT MAINT INFORMED US THAT THE FAN WOULD HAVE TO BE CHANGED IF NOT THE WHOLE ENG. UPON INSPECTING THE WINGS NO DAMAGE WAS FOUND, BUT THERE WAS ICE ON THE WINGS JUST AFT OF THE HEATER BLANKETS AND ON THE LEADING EDGES OF THE FLAPS. SUPPLEMENTAL INFO FROM ACN 324727: ACFT COMMENCED TKOF ROLL ON RWY 34 USING MAX PWR DUE TO HAVING BEEN DEICED AT GATE. AT APPROX 80-90 KTS I NOTICED THE R EPR FLUCTUATE AND FELT ACFT PULL SLIGHTLY TO R. I INITIATED AN ABORT WITHOUT INCIDENT AND CLRED RWY. AFTER ARR AT GATE I AND THE FO ALONG WITH MAINT, OBSERVED SEVERAL BENT BLADES ON THE FOREMOST COMPRESSOR BLADE. WE ALSO OBSERVED SEVERAL SMALL SPOTS OF ICE ON THE AFT PART OF THE R WING. IT IS UNLIKELY THIS WAS PICKED UP DURING TAXI OR EVEN DURING THE ABORT AS THE WX CONDITIONS WERE CLR AND THE RWY WAS ALSO BASICALLY FREE OF CONTAMINANTS. THIS LEADS ME TO BELIEVE THAT THE ACFT WAS NOT PROPERLY DEICED TO BEGIN WITH.

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.

Attributes
ACN	324815
Time
Date	199601
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : yyc
State Reference	AB
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	MD-80 Super 80
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	climbout : takeoff
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
ASRS Report	324815
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	324727
Events
Anomaly	aircraft equipment problem : critical non adherence other other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : rejected takeoff
Consequence	other
Supplementary
Air Traffic Incident	other

An air carrier MD80 flight was aborted due to noise, EPR fluctuation, and yaw, during takeoff roll. Postflt inspection revealed bent fan blades on the right engine, and ice on the wings and leading edges of the flaps. The captain believes that the aircraft was not properly deiced.