SDR UPS04442833

Service difficulty report · Bolt · Boeing 747200

Difficulty date: July 9, 2004
Submitted: August 4, 2004
Operation: Air carrier
Aircraft: N522UP
Make and model: Boeing 747200
Aircraft serial: 21936
Aircraft time: 68,765 hours, 16,239 cycles
System (JASC): 1430 · Fasteners
Part: Bolt
Condition: Corroded
Location: Lt Wing
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

INSPECTION TYPE:C, LT WING CENTER SECTION REAR SPAR WEB AT BS 1241 BULKHEAD FITTING CORROSION REVEALED BETWEEN BOLT NR 7, 8 AND 9. THICKNESS CHECK PER NTM PART 4,57-10-19 RESULT: NR 7 HOLE 0.335 INCH, NR 8 HOLE 0.350 INCH, NR 9 HOLE 0.370 INCH. NR 7, 8 & 9 FASTENER HOLES REAMED TO 0.375 INCH DIA PER UPS EO B747-5710-11129 FIG 6. FASTENER HOLES AREA CORROSION REMOVED AS PER SRM 21-10-01 & REPROTECTED AS PER SRM 51-12-02.

More about the Boeing 747-200