Service difficulty report · Strap · Boeing 7377H4

Difficulty date
April 26, 2023
Submitted
May 25, 2023
Operation
Air carrier
Aircraft
N959WN
Make and model
Boeing 7377H4
Aircraft serial
36674
Aircraft time
38,285 hours, 23,370 cycles
Part
Strap
Condition
Corroded
Location
Zn 200 Fus Top
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

AFT PASSENGER COMPARTMENT FLOOR STRUCTURE: STRAP HAS CORROSION AT BS 1016+11 RBL 17.5<[01] CORROSION ON THE STRAP AT BS1016+11 RBL 17.5 FOUND TO BE OUT OF LIMITS DUE TO NO SRM ALLOWABLE DAMAGE. THE STRUCTURAL ITEM WILL BE REPAIRED BY REPLACEMENT IAW SRM 51-10-02 PAR 9C;[02] REMOVED TRAP BETWEEN BS1016-BS1022 RBL 17.5 IAW SRM 51-40-02;[03] VERIFIED CORRECTIVE ACTIONS 1 AND 2;[04] FABRICATED; LOCATED AND DRILLED NEW FLOOR STRUCTURE STRAP BS 1016+11; RBL 17.5 WL 208 MADE FROM 7075T6#0.050'C; LOT#1505777-1 IAW SRM 51-30-01-0G-0 AND DWG# 147A5730 REV-APPLIED CHEMICAL CONVERSION COATING IAW RM 51-20-01-0G-0 OK TO PRIME;[05] VERIFIED CORRECTIVE ACTIONS 4 OK TO PRIME GIVEN;[06] APPLIED TWO LAYERS OF BMS 10-11 TO REPAIR PART IAW SOPM 20-41-02. OK TO INSTALL;[07] VERIFIED CORRECTIVE ACTION 6. OK TO INSTALL GIVEN;[08] INSTALLED TRAP BETWEEN BS1016-BS1022 RBL 17.5 IAW SRM 51-40-02 AND IAW DWG#147A5730;[09] VERIFIED CORRECTIVE ACTION STEP 8.;[10] VERIFIED MEASUREMENT TABLE AND TASK CARD COMPLETE.

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