Service difficulty report · Sidewall Support · Boeing 7377H4

Difficulty date
March 30, 2022
Submitted
May 2, 2022
Operation
Air carrier
Aircraft
N475WN
Make and model
Boeing 7377H4
Aircraft serial
32474
Aircraft time
59,744 hours, 35,276 cycles
Part
Sidewall Support
Condition
Cracked
Location
Fwd Cargo Bay
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 FLOOR TO SIDEWALL SUPPORT AT RBL 24 BS 500A+2; BS 500A+6; BS 500A+10; BS 500A+14; BS 500A+18; BS 500B+6. / [01] SRM 53-00-53-1A-2 IS APPLICABLE<BR><BR>REMOVED CORROSION IN 6EA LOCATIONS ON FWD CARGO BAY FLOOR TO SIDEWALL SUPPORT RBL24 PER SRM 51-10-02-0G-0 IN AREA OF:<BR><BR>BS500A+02' 1.5'X.80'X.007'<BR>BS500A+06' 1.6'X1.1'X.006'<BR>BS500A+10' 1.4'X1.1'X.003'<BR>BS500A+14' 1.6'X.80'X.002'<BR>BS500A+18' 1.3'X.80'X.003'<BR><BR>BS500B+6' 1.5'X.80'X.003'<BR><BR>FWD CARGO BAY FLOOR TO SIDEWALL SUPPORT AT BS500A+2' AND BS500A+6' FOUND TO BE OUT OF LIMITS IAW SRM 53-00-53-1A-2<BR><BR>DEPTH GAUGE<BR>ATS401<BR>S/N UNKNOWN<BR>10/2022;[02] VERIFIED REWORK OUT OF LIMITS PER SRM 53-00-53-1A-2;[03] FABRICATED NEW FWD CARGO BAY FLOOR TO SIDEWALL SUPPORT RBL24 BS 500A - 500D USING BAC1496-444 LOT#1485395-1 AND LOCATED AND DRILLED HOLES IAW SRM 51-40-05-0G-0 AND DWG 143A7500 REV:A<BR><BR>OK TO APPLY CHEMICAL CONVERSION COATING AND BMS10-11 PRIMER;[04] VERIFIED ITEM 3 CORRECTIVE ACTIONS. OK TO APPLY CHEMICAL CONVERSION COATING AND PRIMER;[05] APPLIED CHEMICALCONVERSION COATING AND BMS 10-11 PRIMER TO FABRICATED FCB FLOOR TO SIDEWALL SUPPORT RBL24 BS500A-500D IAW AMM 51-21-72-370-804 AND AMM 51-00-58/201;[06] INSTALLED NUTPLATES ON FABRICATED FCB FLOOR TO SIDEWALL SUPPORT RBL24 BS500A-500D IAW SRM 51-40-02-0G-0 AND DWG 143A7500 REV:A;[07] VERIFIED CORRECTIVE ACTIONS 5 AND 6.

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