B737-300 crew had engine fan blades that had ice accumulation, and were damaged.

Attributes
ACN	565219
Time
Date	200210
Day	Thu
Local Time Of Day	0001 To 0600
Place
Locale Reference	airport : zzz.airport
State Reference	US
Environment
Light	Night
Aircraft 1
Controlling Facilities	tower : den.tower
Operator	common carrier : air carrier
Make Model Name	B737-300
Operating Under FAR Part	Part 121
Flight Phase	ground : parked
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	565219
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	aircraft equipment problem : critical inflight encounter : weather other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : eng vibration indicator other flight crewa other flight crewb
Resolutory Action	none taken : detected after the fact none taken : anomaly accepted
Consequence	other other other
Supplementary
Problem Areas	Aircraft Weather
Primary Problem	Aircraft

Narrative:

Aircraft engines and gear deiced at gate. After pushback taxied to the deice pad to have the airframe deiced. Deicing was uneventful. After takeoff upon climbing above the overcast the engine anti ice was turned off. A vibration/air noise was heard in the cockpit and cabin. Through a phone patch with maintenance we discussed and troubleshot the noise. We decided it was not going to be a safety of flight issue and elected to continue to destination. The next morning I discovered that several fan blades on the right engine had been damaged. Callback conversation with reporter revealed the following information: the reporter stated the landing gear and engines were deiced on the gate and after pushback the entire airframe was deiced. The reporter said after takeoff a vibration air noise was heard, not a rumble. The reporter stated the noise vibration was reported to the maintenance controller and the flight pressed on. The reporter said at flight termination the #2 engine had fan blade damage. Several fan blades bent forward 2 inches. The reporter said he suspects the damage may have occurred taxiing over patches of ice, but has no idea why the damage was limited to #2 engine only.

Original NASA ASRS Text

Title: B737-300 CREW HAD ENG FAN BLADES THAT HAD ICE ACCUMULATION, AND WERE DAMAGED.

Narrative: ACFT ENGS AND GEAR DEICED AT GATE. AFTER PUSHBACK TAXIED TO THE DEICE PAD TO HAVE THE AIRFRAME DEICED. DEICING WAS UNEVENTFUL. AFTER TKOF UPON CLBING ABOVE THE OVERCAST THE ENG ANTI ICE WAS TURNED OFF. A VIBRATION/AIR NOISE WAS HEARD IN THE COCKPIT AND CABIN. THROUGH A PHONE PATCH WITH MAINT WE DISCUSSED AND TROUBLESHOT THE NOISE. WE DECIDED IT WAS NOT GOING TO BE A SAFETY OF FLT ISSUE AND ELECTED TO CONTINUE TO DEST. THE NEXT MORNING I DISCOVERED THAT SEVERAL FAN BLADES ON THE R ENG HAD BEEN DAMAGED. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE LNDG GEAR AND ENGS WERE DEICED ON THE GATE AND AFTER PUSHBACK THE ENTIRE AIRFRAME WAS DEICED. THE RPTR SAID AFTER TKOF A VIBRATION AIR NOISE WAS HEARD, NOT A RUMBLE. THE RPTR STATED THE NOISE VIBRATION WAS RPTED TO THE MAINT CTLR AND THE FLT PRESSED ON. THE RPTR SAID AT FLT TERMINATION THE #2 ENG HAD FAN BLADE DAMAGE. SEVERAL FAN BLADES BENT FORWARD 2 INCHES. THE RPTR SAID HE SUSPECTS THE DAMAGE MAY HAVE OCCURRED TAXIING OVER PATCHES OF ICE, BUT HAS NO IDEA WHY THE DAMAGE WAS LIMITED TO #2 ENG ONLY.

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.