Service difficulty report · Stiffener · Boeing 74747UF

Difficulty date
July 26, 2010
Submitted
August 3, 2010
Operation
Air carrier
Aircraft
N498MC
Make and model
Boeing 74747UF
Aircraft serial
29259
Aircraft time
47,298 hours, 7,155 cycles
Engine
Ge CF680C2B1F
Part
Stiffener
Condition
Cracked
Location
Nr 2 Nacelle
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

DURING D-CHECK, THE NR2 STRUT WAS FOUND TO HAVE A CRACK IN A STIFFENER TEE ANGLE ON THE INBD SIDE NEAR NAC STA 377 AND NAC WL 155. SEE FIG 1 FOR DAMAGE LOCATION AND REPAIR DETAILS. (THE DAMAGE WAS CUT OUT WITH AN ANGLE AND FILLERS BEING INSTALLED AS SHOWN IN FIG 2 AND IAW SRM 54-51-02 REPAIR NR2 IAW EGAT EI T2010A54B-1540 DOCUMENTED ON EGAT NRC 713 AND APPROVED BY MFG ON RDR DATED 26 JULY 2010. ALL STRUT STIFFENERS ARE CONSIDERED TO BE A PSE ITEM IAW SRM 51-00-04 FIG 2, TABLE I SHEET 4 OF 5.THE DAMAGED TEE IS MADE FROM AND1506-2115 2024-T62 ALUMINUM EXTRUSION IAW SRM 54-51-02, FIG 1, SHEET 2, ITEM 26. THE REPAIR CONSISTED OF CUTTING OUT THE DAMAGE AND INSTALLING AN ANGLE MADE FROM AND10134-1406 70475-T6 EXTRUSION AND FILLERS MADE 7075-T6 ALUMINUM SHEET AND USED BACB30MY6K FASTENERS. THIS CATEGORY A PERMANENT REPAIR HAS MFG RDR APPROVAL DATED 26 JULY 2010 ON MESSAGE EGA-TLS-10-0079-02B AND SR 1-1642701344)

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