Service difficulty report · Skin · Boeing 737*

Difficulty date
October 7, 2021
Submitted
November 15, 2021
Operation
Air carrier
Aircraft
N788SA
Make and model
Boeing 737*
Aircraft serial
30603
Aircraft time
68,361 hours, 40,407 cycles
Part
Skin
Condition
Corroded
Location
Fuselage
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

CORROSION ON FUSELAGE SKIN AT B.S. 1016 - 1088; L.B.L. 14 - R.B.L. 14; W.L. 306.5. ; / [01] REMOVED CORROSION ON FUSELAGE SKIN AT BS 1016 - 1088 LBL 14 - RBL 14 WL 306.5 ; ON MULTIPLE AREAS OF 20'X5' ; 10'X5' ; 33'X11' IAW SRM 53-00-01-1A-1; [02] VERIFIED CORRECTIVE ACTION STEP 1.; [03] REMOVED 55 FASTENERS IN THE DAMAGED AREA FOR ACCESS IAW SRM 51-40-02; [04] UT THICKNESS TESTED ALL BLENDED AREAS PER 737NDT PART 4 51-00-00 PROCEDURE 2. LOWEST REMAINING THICKNESS IN .063 POCKETS IS .059' AND LOWEST REMAINING IN .080 AREAS IS .076'. CAL ID E650; ATS2342.; [05] CORROSION ON FUSELAGE SKIN AT BS 1016 - 1088 LBL 14 - RBL 14 WL 306.5 FOUND TO BE OUT OF LIMITS DUE TO THE REMOVAL OF MATERIAL AROUND MORE THAN 3 FASTENERS IAW SRM 53-00-01-1A-1; [06] VERIFIED CORRECTIVE ACTION STEP 5.; [07] CORRECTION TO ITEM 4: LOWEST REMAINING THICKNESS IN ORIGINAL .080' AREA IS .067' PER ORIGINAL GRID MAP.; [08] CERTIFIED CORRECTION TO ITEM 4.; [09] INSTALLED 55 FASTENERS PER SRM 51-40-02 AND EA 21-153-03115; [10] VERIFIED FASTENERS REINSTALLED ON EA 21-153-03115-WIP 2 REF FAULT #TT8Q00705Z7; [11] VERIFIED TASK CARD IS COMPLETE.