<< >> NASA ASRS Report 327381, February 1996

FAA inspector reported fan blade damage. Maintenance follow-up with inspection, manuals checked, limits were within svcable condition.

Attributes
ACN	327381
Time
Date	199602
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : zzz
State Reference	US
Altitude	agl bound lower : 0 agl bound upper : 0
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B737-200
Operating Under FAR Part	Part 121
Flight Phase	ground : preflight
Flight Plan	IFR
Person 1
Affiliation	Other
Function	other personnel other other personnel other
Qualification	other other : other
ASRS Report	327381
Person 2
Affiliation	Other
Function	other personnel other
Qualification	other other : other
Events
Anomaly	other anomaly other
Independent Detector	other other : unspecified
Resolutory Action	other
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

A B737-222 with JT8D-7 engines. Captain advised FAA inspector reported #1 engine fan blade had damage with large piece missing. Reviewed history of engine and found fan blade tip had been repaired (cropped) in feb/95, approximately 2400 hours previous. I faxed copy of maintenance manual for inspector to compare blade with maintenance manual limits. After discussion, I decided to have local mechanic familiar with the JT8 engine re- evaluate condition/findings. I faxed complete maintenance manual 'first stage fan blade repair/limits' to accomplish complete evaluation. I also reviewed with airlines engine tech services JT8 group. After some discussion, mr. X advised that undercut per maintenance manual was acceptable. He also noted that there was some erosion on leading edge and tip areas, but did not exceed maintenance manual limits for svcable condition.

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Original NASA ASRS Text

Title: FAA INSPECTOR RPTED FAN BLADE DAMAGE. MAINT FOLLOW-UP WITH INSPECTION, MANUALS CHKED, LIMITS WERE WITHIN SVCABLE CONDITION.

Narrative: A B737-222 WITH JT8D-7 ENGS. CAPT ADVISED FAA INSPECTOR RPTED #1 ENG FAN BLADE HAD DAMAGE WITH LARGE PIECE MISSING. REVIEWED HISTORY OF ENG AND FOUND FAN BLADE TIP HAD BEEN REPAIRED (CROPPED) IN FEB/95, APPROX 2400 HRS PREVIOUS. I FAXED COPY OF MAINT MANUAL FOR INSPECTOR TO COMPARE BLADE WITH MAINT MANUAL LIMITS. AFTER DISCUSSION, I DECIDED TO HAVE LCL MECH FAMILIAR WITH THE JT8 ENG RE- EVALUATE CONDITION/FINDINGS. I FAXED COMPLETE MAINT MANUAL 'FIRST STAGE FAN BLADE REPAIR/LIMITS' TO ACCOMPLISH COMPLETE EVALUATION. I ALSO REVIEWED WITH AIRLINES ENG TECH SVCS JT8 GROUP. AFTER SOME DISCUSSION, MR. X ADVISED THAT UNDERCUT PER MAINT MANUAL WAS ACCEPTABLE. HE ALSO NOTED THAT THERE WAS SOME EROSION ON LEADING EDGE AND TIP AREAS, BUT DID NOT EXCEED MAINT MANUAL LIMITS FOR SVCABLE CONDITION.

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.