Service difficulty report · Support · Boeing 7377H4

Difficulty date
March 16, 2023
Submitted
April 24, 2023
Operation
Air carrier
Aircraft
N957WN
Make and model
Boeing 7377H4
Aircraft serial
41528
Aircraft time
38,518 hours, 23,626 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

MULTIPLE AREA OF CORROSION ON FWD CARGO BAY FLOOR TO SIDEWALL SUPPORT AT RBL 24 BS 500A-500D.<[01] VERIFIED APPLICABILITY OF SRM 53-00-53-1A-2 ALLOWABLE DAMAGE 2;[02] REMOVED CORROSION ON FCB FLOOR TO SIDEWALL SUPPORT AT BS500A +2'; RBL24; WL156. AREA REMOVED W:1' X L:1' D:0.015' ORIGINAL THICKNESS 0.040'; REMAINING THICKNESS 0.025' FOUND TO BE OUT OF LIMITS PER SRM 53-00-53-1A-2 FIG103. DETAIL D. USING TOOL: ID:ATS1225 S/N UNKNOWN DUE DATE: 08/2023;[03] VERIFIED CORROSION REMOVAL IS OUT OF LIMITS PER SRM 53-30-15-1A-1; STEP 4.G(2)B; FIG. 103 DETAIL D;[04] REMOVED FCB FLOOR TO SIDEWALL SUPPORT AT BS397 - BS420; RBL24; WL156 PER SRM 51-40-02-0G-0;[05] CORRECTION ON BS; REMOVED FCB FLOOR TO SIDEWALL SUPPORT AT BS500A - BS500D; RBL24; WL156 PER SRM 51-40-02-0G-0;[06] FABRICATED LOCATED AND DRILLED NEW FCB FLOOR TO SIDEWALL SUPPORT AT BS500A - BS500D; RBL24; WL156 USING BAC1496-444#7075T62 LOT# 1520195-1 PER SRM 51-40-05-0G-0 AND DWG 143A7500;[07] APPLIED CHEMICAL CONVERSION COATING TO FLOOR TO SIDEWALL SUPPORT PER AMM 51-21-41-370-802. OK TO PRIME;[08] VERIFIED CORRECTIVE ACTION 6 AND 7.;[09] APPLIED PRIMER TO FLOOR TO SIDEWALL SUPPORT PER AMM 51-21-72-370-804.<BR>THE INSTALLATION WILL BE ATTENDED IN CPCP/AD MOC FCB FLOOR STRUCTURE CORROSION PROTECTION [TTG8Q004C3LZ];[10] VERIFIED CORRECTIVE ACTION 9 AND MEASUREMENT TABLE;[11] JOB COMPLETE

More about the Boeing 737-7H4