Service difficulty report · Skin · Boeing 7377H4

Difficulty date
November 23, 2021
Submitted
December 27, 2021
Operation
Air carrier
Aircraft
N455WN
Make and model
Boeing 7377H4
Aircraft serial
32462
Aircraft time
58,698 hours, 34,771 cycles
Part
Skin
Condition
Cracked
Location
Bs 1012-1044
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 CROWN SKIN UNDER VERTICAL STABILIZER STA 1012 TO STA 1044; RBL 8 TO RBL 13. ; / [01] REMOVED CORROSION ON CROWN SKIN UNDER VERTICAL STABILIZER STA 1016 TO 1040 RBL 8 TO RBL 13 REWORKED AREAS A= L: 15.6' W: 1.2' B= L: 9.7' W: 2.2' C= L: 4' W: 3.8' IAW SRM 53-00-01-1A-1; [02] REMOVED 27(EA) FASTENERS AROUND REWORKED AREAS IAW SRM 51-40-02-0G-0; [03] VERIFIED ACTION 1; 2; [04] REQ NDI FOR FREE CRACK CONDITION; OPEN HOLES UT AND REMAINING THICKNESS; AROUND REWORKED AREA; CROWN SKIN UNDER VERTICAL STAB STA 1016 TO 1040;AFTER FURTHER EVALUATION DAMAGE FOUND TO BE OUT OF LIMIT IAW SRM 53-00-01-1A-1 STEP 4.C ITEM 2 FIGURE 103 DETAIL D. SUBMIT TO ENGINEERING; [07] VERIFIED REMAINING THICKNESSES AS NOTED BY NDI IN ITEM 5. AND AMT IN STEP 6. VERIFIED OUT OF LIMITS PER SRM 53-00-01-1A-1.; [08] INSTALLED 27(EA) FASTENERS AROUND REWORKED AREAS IAW SRM 51-40-02-0G-0 AND EA 21-153-03570; [09] VERIFIED CORRECTIVE ACTION 8; [10] CORROSION ON CROWN SKIN UNDER VERTICAL STABILIZER STA 1012 TO 1044; RBL 8 TO RBL 13 REPAIRED PER EA 21-153-03570-WIP1.;

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