SDR UIEA200700122

Service difficulty report · Skin · 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): 5414 · Nacelle/Pylon, Plate/Skin
Part: Skin
Condition: Cracked
Location: Nr 4 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 4 PYLON CUT-OUT FOR PRE-COOLER EXHAUST AIR, RT SIDE OF PYLON AT NACELLE STATION 248.0 HAS A 2.625 INCH CRACK AT AFT, LOWER CORNER. ACCOMPLISHED INTERIM REPAIR, LOCATED CRACK AS PER NDT 747 MANUAL 51-00-00 PAR 6 AND STOP DRILLED BY REAMING EXISTING HI-LOCK HOLE TO .312 INCH DIAMETER AS PER 747 SRM 51-10-01 AND SRM 51-30-02. VERIFIED CRACK HIT HOLE AND INSTALLED HI-LOCK AS PER 747 SRM 51-30-02. REFERENCE ATLAS AIR XEO 54-030207.