Service difficulty report · Structure · Boeing 7377H4

Difficulty date
July 29, 2021
Submitted
September 15, 2021
Operation
Air carrier
Aircraft
N491WN
Make and model
Boeing 7377H4
Aircraft serial
33867
Aircraft time
53,758 hours, 31,898 cycles
Part
Structure
Condition
Corroded
Location
Bs 696 Lbl63
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 INNER CHORD AT PASSENGER CABIN BS696 LBL63 WL208. ; / [01] REMOVED CORROSION ON INNER CHORD AT BS.696 LBL63 WL 208 PER SRM 51-10-02-0G-0 STEP 15; [02] INNER CHORD AT BLENDED AREA FOUND TO BE OUT OF LIMITS DUE TO NO ALLOWABLE LIMITS FOUND IN SRM; [03] VERIFIED CORROSION EVALUATION FOUND TO BE OUT OF LIMITS DUE TO NO ALLOWABLE DAMAGE PER SRM 51-10-02.; [04] UT THICKNESS TESTED BLENDED AREA PER 737NDT PART 4 51-00-00 PROCEDURE 2. LOWEST REMAINING THICKNESS IS .068'. FILLED OUT GRID MAP. CAL ID ATS2342 S/N 190848504; [05] LIMIT STATEMENT:INNER CHORD DAMAGE BS696 LBL63 WL208 FOUND TO BE OUT LIMITS DUE TO NO ENTRIES FOUND ON SRM PART TO BE REPLACE I.A.W SRM 51-10-02-0G-0 PAR 9.C; [06] VERIFIED NO LIMITS IN THE SRM- PART TO BE REPLACED; [07] REMOVED INNER CHORD FROM BS. 663+10-727+5 LBL 63 WL 208 PER SRM 51-40-02-0G-0; [08] VERIFIED INNER CHORD REMOVAL; [09] CORRECTED MEASUREMENT FIELD CORROSION LEVEL IS LEVEL 2; [10] VERIFIED CORRECTION TO MEASUREMENTS FIELD; [11] LOCATED AND DRILLED AND COUNTERSUNK NEW CREASEBEAM INNER CHORD IN PASSENGER CABIN STA673-727+5; LBL 65; WL 208 PER SRM 51-40-02-0G-0; SRM 51-40-05-0G-0; SRM 51-40-08-0G-0; DWG# 144A5900; REV A.

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