SDR UIEA01045

Service difficulty report · Pressure Panel · Boeing 747230B

Difficulty date
April 21, 2001
Submitted
May 17, 2001
Operation
Air carrier
Aircraft
N509MC
Make and model
Boeing 747230B
Aircraft serial
21221
Part
Pressure Panel
Condition
Cracked
Location
Fuselage
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

DURING INSPECTION OF PRESSURE DECK NUMEROUS AREAS WERE FOUND WITH SPOT CORROSION BETWEEN BS 1460/1480 AT RBL 6, RBL 26.5; LBL 6, LBL 20, LBL 39, LBL 47.5. MOST AREAS BLENDED TO SRM LIMITS, TREATED AND FINISHED PER STANDARD PRACTICES. THE FOLLOWING AREAS WERE REPAIRED BY TRIMMING OUT THE CORRODED AREAS AT LBL 39, LBL 48. AT RBL 6; LBL 6 AND 20 CORROSION CRACK WAS REMOVED BY STEP DRILLING AND SUBSEQUENTLY FREEZE PLUGS INSTALLED. FILLER SECTIONS AND REPAIR DOUBLERS WERE FABRICATED FOR ALL ABOVE AREA. INSTALLED REPAIR FILLERS AND DOUBLERS PER STANDARD PRACTICES. (M)