SDR UIEA01073

Service difficulty report · Fitting · Boeing 747243B

Difficulty date: July 11, 2001
Submitted: July 31, 2001
Operation: Air carrier
Aircraft: N518MC
Make and model: Boeing 747243B
Aircraft serial: 23476
System (JASC): 5400 · Nacelle/Pylon Structure
Part: Fitting
Part number: 65B941383
Condition: Cracked
Location: Nr 4 Pylon
Part time: 62,573 hours
Stage of operation: IN
Nature of condition: O
Precautionary procedure: O

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

DURING INSPECTION, FOUND THE NR 4 PYLON STRUT TO DIAGONAL BRACE FITTING WITH ONE SHEARED FASTENER. OVERSIZED HOLE, HFEC OF OVERSIZED HOLE INDICATED A DEFECT IN THE ATTACH FITTING. REMOVED PYLON, REMOVED FITTING, FOUND RADIUS FILLER NOT INSTALLED. PERFORMED HFEC OPEN HOLE INSPECTION FOR ADDITIONAL CRACKING. NO CRACKS FOUND. INSTALLED NEW FITTING AND SEAL BACK-UP PLATE IAW SB747-54A2208 AND 747-54A2196. REINSTALLED PYLON. (M)