SDR NWAA072026739

Service difficulty report · Tension Tie · Boeing 747251F

Difficulty date: May 15, 2007
Submitted: May 30, 2007
Operation: Air carrier
Aircraft: N639US
Make and model: Boeing 747251F
Aircraft serial: 23887
Aircraft time: 73,897 hours, 16,043 cycles
System (JASC): 5322 · Fuselage Internal Mounting Structure
Part: Tension Tie
Condition: Cracked
Location: Bs 820
Stage of operation: IN
How discovered: 9
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 "M" CHECK, FOUND CRACKS IN BS 820 TENSION TIE FRAME WEB FASTENER HOLES RH NR 4, NR 10 AND LT NR 4, NR 9,NR 10, NR 11 AND NR 13. ALSO, FOUND ONE FASTENER HOLE CRACKED ON FAILSAFE CHORD ON S10A. REPAIRED PER EA 209243 SECT I AND SECT II SECTION III AND IV REQUIRE INSPECTIONS AT 3000 CYCLE INTERVALS.