SDR WRNA200700034

Service difficulty report · Rib · Boeing 747212B

Difficulty date: February 14, 2007
Submitted: June 14, 2007
Operation: Air carrier
Aircraft: N526UP
Make and model: Boeing 747212B
Aircraft serial: 21937
Aircraft time: 89,777 hours, 16,916 cycles
System (JASC): 5730 · Wing, Plate/Skin
Part: Rib
Condition: Cracked
Location: Nr 4 Fuel Tank
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 C-CHECK, THE LOWER RIB CORD OF NR 4 FUEL TANK ACCESS PANEL 652AB, WS 972 WAS FOUND CRACKED FROM RADIUS BLOCK TO RADIUS BLOCK. REMOVED LOWER RIB CORD IAW SRM 51-30-00, FABRICATED NEW RIB CORD IAW DRAWING 65B01073 AND INSTALLED RIB CORD IAW SRM 51-30-02.

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