A B737-800 crew requested engine fan de-ice prior to engine start. After engine start; crew returned for another engine fan de-ice because of fan vibration.

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Attributes
ACN	765279
Time
Date	200712
Local Time Of Day	0001 To 0600
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 0
Environment
Flight Conditions	IMC
Light	Night
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B737-800
Operating Under FAR Part	Part 121
Flight Phase	ground : preflight
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Experience	flight time last 90 days : 200 flight time type : 4000
ASRS Report	765274
Events
Anomaly	ground encounters : fod non adherence : published procedure non adherence : far non adherence : company policies
Independent Detector	other flight crewa
Resolutory Action	flight crew : took precautionary avoidance action other
Supplementary
Problem Areas	Environmental Factor Weather Company
Primary Problem	Company

Narrative:

First officer noticed engine fan blade icing during walkaround. We requested and received hot air engine deicing. When deicing completed; we pushed; started and noticed higher than normal engine vibration during start and idle on both engines. We returned to the gate; the engines were inspected and found to have ice on the engine fan blades. Engines were again deiced; maintenance inspected engines for damage and observed a normal engine run; found nothing unusual; the logbook was signed off and we departed uneventfully. Normal engine vibration is approximately .2-.5. Our vibration was approximately 1.3 following the first (incomplete) deicing.

Original NASA ASRS Text

Title: A B737-800 CREW REQUESTED ENG FAN DE-ICE PRIOR TO ENG START. AFTER ENG START; CREW RETURNED FOR ANOTHER ENG FAN DE-ICE BECAUSE OF FAN VIBRATION.

Narrative: FO NOTICED ENG FAN BLADE ICING DURING WALKAROUND. WE REQUESTED AND RECEIVED HOT AIR ENG DEICING. WHEN DEICING COMPLETED; WE PUSHED; STARTED AND NOTICED HIGHER THAN NORMAL ENG VIBRATION DURING START AND IDLE ON BOTH ENGS. WE RETURNED TO THE GATE; THE ENGS WERE INSPECTED AND FOUND TO HAVE ICE ON THE ENG FAN BLADES. ENGS WERE AGAIN DEICED; MAINT INSPECTED ENGS FOR DAMAGE AND OBSERVED A NORMAL ENG RUN; FOUND NOTHING UNUSUAL; THE LOGBOOK WAS SIGNED OFF AND WE DEPARTED UNEVENTFULLY. NORMAL ENG VIBRATION IS APPROX .2-.5. OUR VIBRATION WAS APPROX 1.3 FOLLOWING THE FIRST (INCOMPLETE) DEICING.

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.