SDR UIEA200600222

Service difficulty report · Fan Blade · Boeing 74747UF

Difficulty date: August 31, 2006
Submitted: September 6, 2006
Operation: Air carrier
Aircraft: N415MC
Make and model: Boeing 74747UF
Aircraft serial: 32837
Aircraft time: 18,006 hours, 2,910 cycles
Engine: Ge CF680C2B2
Engine time: 20,671 hours, 3,262 cycles
System (JASC): 7220 · Turbine Engine Air Inlet Section
Part: Fan Blade
Condition: Lack Of Lube
Location: Nr 1 Engine
Part time: 20,671 hours, 3,262 cycles
Stage of operation: IN
How discovered: V
Nature of condition: O
Precautionary procedure: K

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

N415MC AT PIK FOR MSG-3, C-4&A-4 CHECK. AS PER N/ROUTINE 154, NR 1 ENGINE S/N 704-916 FAN BLADES REMOVED FOR LUBRICATION. IT WAS FOUND, FAN DISKS HAVE NO EVIDENCE OF LUBRICANT. INSPECTION PERFORMED IAW MM 72-31-00, 206 TABLE 601 NR 1 DOVETAILS ON FAN DISK HAVE COATING MISSING ON PRESSURE FACES. (CU-NI-INDIUM) ALSO PER ENGINE SHOP MANUAL SUBTASK 72-21-03, 220-054 SECTION-C FRETTING ON PRESSURE FACES. THIS REQUIRES INSPECTION BY ENGINE SHOP WITH APPROPRIATE TOOLING FOR DEEP DISK INSPECTION.

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