SDR UIEA2011063000356

Service difficulty report · Bulkhead · Boeing 747243B

Difficulty date: June 30, 2011
Submitted: July 11, 2011
Operation: Air carrier
Aircraft: N517MC
Make and model: Boeing 747243B
Aircraft serial: 23300
Aircraft time: 91,897 hours, 15,722 cycles
System (JASC): 5412 · Nacelle/Pylon, Bulkhead/Firewall
Part: Bulkhead
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

NR1 PYLON AFT SIDE OF REAR ENG MOUNT BULKHEAD WAS FOUND 1 EA SCREW HOLE CRACKED ON 1 O/C AND 2 O/C POSITION APPROX .1250" AND .2500 " LENGTH (NR 1 PYLON AFT SIDE OF REAR ENG MOUNT BULKHEAD LT FRAME WEB REPLACE ACCOMPLISHED IAW RS54-53-37139, REV A).