Service difficulty report · Support · Boeing 7377H4

Difficulty date
January 24, 2023
Submitted
March 6, 2023
Operation
Air carrier
Aircraft
N955WN
Make and model
Boeing 7377H4
Aircraft serial
36671
Aircraft time
38,739 hours, 23,607 cycles
Part
Support
Condition
Corroded
Location
Zn 100 Fus Lower
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 FWD CARGO BAY AFT LOWER BULKHEAD SUPPORT AT BS 500D LBL 23; LBL 17; LBL 14; LBL 10; LBL 9; LBL 1; RBL 1; RBL 7; RBL 14; RBL 18.<[01] SRM 53-30-08-1A-1 IS FOUND TO BE APPLICABLE. EVALUATED 10 SPOTS OF CORROSION FROM BS500D LBL23-RBL18 THE DEEPEST SPOT IS .5L X .5W Y.009. ORIGINAL THICKNESS IS 0.071; REMINING THICKNESS IS 0.062. PART IS (IN LIMITS). IAW SRM 53-30-08-1A-1<BR>CAL TOOL ID: ATS2595 SER#F03295 EXP: 02/2023;[02] VERIFIED CORROSION REMOVAL AT ALL REWORK AREAS LESS LBL9 AND RBL14 PER SRM51-10-02. SEE STEP 1.;[03] COMPLETE STEP 1;[04] VERIFIED STEP1 1 LIMIT STATEMENT.;[05] RECEIVED NEW BULKHEAD SUPPORT ITEM: 143A9485-35 LOT: 1510867-1. PO#893922/1LOCATED AND DRILLED NEW BULKHEAD SUPPORT 500D LBL25 RBL23 WL 156 IAW SRM 51-40-05 DWG 143A9485 REV:B COUNTERSINK IAW SRM 51-40-08 APPLIED CHEMICAL CONVERSION COATING IAW SRM 51-20-01. APPLIED PRIMER IAW SOPM 20-41-02;[06] VERIFIED CORRECTIVE ACTIONS STEP 5.;[07] VERIFIED CORRECTIVE ACTION ITEMS COMPLETED; CARD COMPLETE.

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