Service difficulty report · Support · Boeing 7377H4

Difficulty date
February 17, 2023
Submitted
March 13, 2023
Operation
Air carrier
Aircraft
N289CT
Make and model
Boeing 7377H4
Aircraft serial
36633
Aircraft time
50,940 hours, 30,659 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

FWD CARGO BAY - SIDEWALL SUPPORT HAS CORROSION BS 400+17 RBL 18.<[01] VERIFIED APPLICABILITY SRM 53-30-53-0I-2 FOR IDENTIFICATION AND SRM 53-00-53-1A-2 FOR ALLOWABLE DAMAGE.;[02] REMOVED CORROSION ON FWD CARGO BAY SIDEWALL SUPPORT AT BS 400+17 RBL 18 IAW SRM 51-10-02.<BR><BR>EVALUATED BLENDED AREA L=0.800' W=0.400' ORIGINAL THICKNESS 0.040' PER BAC1496-444 REMAINING 0.020' LOSS 0.020'; MAX MAT REMOVE ALLOWABLE 0.004'; FOUND TO BE OUT OF LIMITS IAW SRM 53-00-53-1A-2 PARA 4A (2) FIG 103 DETAIL D.<BR><BR>TOOL ID: ATS 1671 S/N: 65093024 DUE:07/2023;[03] VERIFIED CORRECTIVE ACTION 1 AND 2;[04] FABRICATED NEW FLOOR TO SIDEWALL SUPPORT BS400 - BS420; RBL 18; BAC1496-444#7075T6; LOT# 1515896-1; PER SRM 51-40-05 AND DWG 143A7501.;[05] VERIFIED CORRECTIVE ACTION 4 AND THE MEASUREMENT TABLE.;[06] APPLIED CHEMICAL CONVERSION COATING AND PRIMER ON NEW PART; PER SRM 51-20-01 AND SOPM 20-41-02.;[07] VERIFIED CORRECTIVE ACTION 6.;[08] UPDATE CORRECTIVE ACTION 7.

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