Service difficulty report · Support · Boeing 7378H4

Difficulty date
February 16, 2023
Submitted
March 20, 2023
Operation
Air carrier
Aircraft
N8528Q
Make and model
Boeing 7378H4
Aircraft serial
36927
Aircraft time
19,732 hours, 9,567 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

CORROSION ON AFT CARGO BAY L/H FLOOR TO SIDEWALL SUPPORT BS 727G+16 TO 847 LBL 21 WL 156<[01] EVALUATED CORROSION AT ALL LOCATIONS OF FLOOR TO SIDEWALL SUPPORT; FOUND DEEPEST LOCATION TO BE AT BS 727I+4 LBL 21 WL 156; FOUND 0.015 REMOVED FROM ORIG 0.040 IN NUMEROUS 1'X1' AREAS; FOUND TO BE OUT OF LIMITS PER SRM 53-00-53-1A-2 USING DIAL DEPTH GAUGE ATS 2473 DUE 08/2023;[02] VERIFIED CORRECTIVE ACTION 1 AND MEASUREMENT TABLE.;[03] REMOVED DAMAGED SECTION OF ACB LH FLOOR TO SIDEWALL SUPPORT; BS727G+10 TO 847; LBL21; IAW SRM 53-00-53-2R-5.;[04] FABRICATED REPAIR PARTS FOR ACB LH FLOOR TO SIEWALL SUPPORT; BS727G+10 TO 847; LBL21; IAW SRM 51-40-02-0G-0; SRM 51-40-05-0G-0; SRM 53-00-53-2R-5; APPLIED CHEMICAL CONVERSION COATING; IAW SRM 51-20-01-0G-0. MATERIAL BAC1496-377#7075T62 LOT#1515191-1;[05] OK TO PRIME REPAIR PARTS.;[06] VERIFIED CORRECTIVE ACTIONS STEPS 3;4;AND OK TO PRIME FOR CORRECTIVE ACTIONS STEP 5 GIVEN.;[07] ADDING TO REFERENCES EA; M-22-153-01550.;[08] PRIMED AND ASSEMBLED REPAIR PARTS; IAW SRM 53-00-53-2R-5; ER M-22-153-01550. AND OK TO INSTALL.;[09] VERIFIED CORRECTIVE ACTION #8;[10] INSTALLED REPAIR PARTS FOR ACB LH FLOOR TO SIDEWALL SUPPORT; BS727G+10 TO 847; LBL21; SPLICES AT BS727G+10 AND 807+8; IAW SRM 51-40-02-0-0 SRM 53-00-53-2R-5; DWG 146A7500. ' THE DAMAGE WAS REPAIRED PER SRM 53-00-53-2R-5 (REPAIR 5) AND EA M-22-153-01550'.;[11] FINAL INSPECTION. JOB COMPLETE.;[12] FINAL INSPECTION. JOB COMPLETE.

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