Service difficulty report · Sidewall Support · Boeing 7377H4

Difficulty date
March 8, 2023
Submitted
April 12, 2023
Operation
Air carrier
Aircraft
N956WN
Make and model
Boeing 7377H4
Aircraft serial
36672
Aircraft time
38,869 hours, 23,696 cycles
Part
Sidewall 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 WL 156 - RBL 23.5 BS 500A+1.5; BS 500A+6.5; BS 500A+16.75; BS 500B+6.75; BS 500B+11; BS 500B+16.5; 500C+1.5.<REMOVED CORROSION FROM MULTIPLE LOCATIONS ON FCB FLOOR TO SIDEWALL SUPPORT BS50A-500D RBL 23.5<BR><BR>500A+1.5 MEASURED 0.6'W X 0.75'L AND 0.004'DEEP FOUND TO BE IN LIMITS<BR>500A+6.5 MEASURED 0.6'W X 0.8'L AND 0.0035'DEEP FOUND TO BE IN LIMITS<BR>500A+16.75 MEASURED 0.5'W X 0.6'L AND 0.0055'DEEP FOUND TO BE OUT OF LIMITS 500B+6.75 MEASURED 0.4'W X 0.5'L AND 0.0075'DEEP FOUND TO BE OUT OF LIMITS<BR>500B+11 MEASURED 0.5'W X 0.5'L AND 0.0035'DEEP FOUND TO BE IN LIMITS<BR>500B+16.5 MEASURED 0.6'W X 1.1'L AND 0.005'DEEP FOUND TO BE OUT OF LIMITS 500C+1.5 MEASURED 0.5'W X 0.6'L AND 0.006'DEEP FOUND TO BE OUT OF LIMITS FABRICATED; LOCATED AND DRILLED NEW FWD CARGO BAY SIDEWALL SUPPORT FROM BAC1496-444#7075T62; LOT# 1520195-1; IAW SRM 51-40-05-0G-0; DWG 143A7501; ID:0114; REV: -; DWG 143A7500; ID:0071; REV: - FABRICATED; LOCATED AND DRILLED NEW FWD CARGO BAY SIDEWALL SUPPORT FROM BAC1496-444#7075T62; LOT# 1520195-1; FROM BS 500A TO BS 500D; RBL 23.5; WL 156 IAW SRM 51-40-05-0G-0; DWG 143A7501; ID:0114; REV: -; DWG 143A7500; ID:0071; REV: -; APPLIED CHEMICAL CONVERSION IAW AMM 51-21-41-370-802; APPLIED PRIMER ON NEW FWD CARGO BAY SIDEWALL SUPPORT IAW AMM 51-21-72-370-804;INSTALLED ADHESIVE BONDED NUTPLE ON NEW FWD CARGO BAY SIDEWALL SUPPORT FROM BS 500A TO BS 500D ; RBL 23.5; WL 156 IAW SRM 51-40-10-2R-0

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