Service difficulty report · Support · Boeing 7377H4

Difficulty date
March 31, 2022
Submitted
April 25, 2022
Operation
Air carrier
Aircraft
N769SW
Make and model
Boeing 7377H4
Aircraft serial
30588
Aircraft time
74,146 hours, 43,614 cycles
Part
Support
Condition
Corroded
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 L/H FLOOR TO SIDEWALL SUPPORT FROM STA 420+4 TO STA 500C+14; LBL 24; WL 156. / [01] REMOVED CORROSION ON FCB L/H FLOOR TO SIDEWALL SUPPORT BTW BS 480+7' TO 500D REWORKED AREA BTW BS 500B TO 500C' IN L=1' X W=1' X D= .002' FROM ORIGINAL THICKNESS OF .040' FOUND TO BE IN LIMITS <BR>USED TOOL :<BR>ID:ATS2503; S/N:A19335646 ; DATE:04/2021 ; DUE: 04/2022<BR>REMOVED CORROSION ON FCB L/H FLOOR TO SIDEWALL SUPPORT BTW BS 396 TO 480+7' REWORKED AREA BS 440+13' IN L=1' X W=1' X D= .010' FROM ORIGINAL THICKNESS OF .040' FOUND TO BE OUT OF LIMITS WILL BE REPAIRED BY SRM 53-00-53-2R-6.<BR>USED TOOL :<BR>ID:ATS2503; S/N:A19335646 ; DATE:04/2021 ; DUE: 04/2022 <BR>IAW SRM 53-00-53-1A-2 PAR. 4A. FIG 103 DETAIL E.<BR>REQUEST OK TO TREAT AND PRIME SECTION BS 396 TO 480+7' #1; FWD HALF OUT OF LIMITS; AFT HALF IN LIMITS;[03] FABRICATED NEW SECTION FLOOR SIDEWALL SUPPORT L/H FCB FROM P/N: BAC1496-444#7075T6 LOT: 1485395-1 BETWEEN BS 369 TO BS 480+7' IAW SRM 53-00-53-2R-6. REQUEST TREAT AND PRIMEFABRICATED SPLICE P/N: BAC1496-444#7075T6 LOT: 1485395-1 ON FLOOR TO SIDEWALL SUPPORT BETWEEN BS 480 TO BS 500 L/H IAW SRM 53-00-53-2R-6. REQUEST TREAT AND PRIME..APPLIED CHEMICAL CONVERSION COATING AND PRIMER ON FLOOR SIDEWALL SUPPORT AND SPLICE BS 396 TO 500D IAW SRM 51-20-01 AND SOPM 20-41-02. ] INSTALLED SPLICE TO FLOOR TO SIDEWALL SUPPORT ON FCB BETWEEN BS 480 TO BS 500 L/H IAW SRM 53-00-53-2R-6 FIG 202 AND 51-40-02.; FIXED MEASUREMENTS 22 TO MINOR;

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