SDR UIEA200700121

Service difficulty report · Frame · Boeing 747243B

Difficulty date: March 2, 2007
Submitted: March 14, 2007
Operation: Air carrier
Aircraft: N540MC
Make and model: Boeing 747243B
Aircraft serial: 22508
Aircraft time: 98,608 hours, 17,063 cycles
System (JASC): 5411 · Nacelle/Pylon, Frame/Spar/Rib
Part: Frame
Condition: Cracked
Location: Nr 1 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

NR 1 PYLON AFT UPPER BULKHEAD "T" FRAME HAS A CRACK AT AFT FLANGE AND A SECOND CRACK AT FORWARD FLANGE, OUTBOARD OF NR 1 PYLON FRONT SPAR CHORD ASSEMBLY. AFT FLANGE CRACK IS 0.750 INCH LONG. FORWARD FLANGE CRACK IS 0.375 INCH LONG AT NACELLE STATION 270.00. ACCOMPLISHED INTERIM REPAIR AS PER 747-200 SRM 51-30-02 AND ATLAS AIR XEO NR 54-030107, FAA FORM 8110-3 ISSUED AND APPROVED. PERMANENT REPAIR TO BE ACCOMPLISH AT NEXT "C" CHECK.