SDR EIA2005028

Service difficulty report · Floorbeam · Boeing 747273C

Difficulty date: February 22, 2005
Submitted: March 29, 2005
Operation: Air carrier
Aircraft: N471EV
Make and model: Boeing 747273C
Aircraft serial: 20651
Aircraft time: 91,668 hours, 21,858 cycles
System (JASC): 5315 · Fuselage Main, Floor Beam
Part: Floorbeam
Condition: Cracked
Location: Fuselage
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

BS 420 UPPER FLOORBEAM TOP CHORD AT RBL 57 AND OUTBOARD HAS NUMEROUS (5) FASTENER HOLES WITH CRACK INDICATIONS (RBL 57.75, 58.25, 63, 67.5, AND 89.5). REMOVED AND REPLACED STA 420 FLOORBEAM UPPER CHORD DUE TO NUMEROUS CRACK INDICATIONS PER SERVICE BULLETIN 747-53A2429 P11. DRILLED PER B747 SRM 51-30-05 PAGES 6-9, ALODINED PER B747 SRM 51-10-02 PAGES 7-8 AND PRIMED PER BSOPM 20-41-02 PAGE 7-9.