Service difficulty report · Threshold · Boeing 7378H4

Difficulty date
July 1, 2022
Submitted
July 25, 2022
Operation
Air carrier
Aircraft
N8641B
Make and model
Boeing 7378H4
Aircraft serial
60085
Aircraft time
27,233 hours, 12,566 cycles
Part
Threshold
Part number
146A812325
Condition
Corroded
Location
Aft 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 AFT CARGO BAY THRESHOLD AT RBL26 BS 787+16-807; RBL26 BS 807+5; RBL26 BS 807+7-10; RBL26 BS 807+14-18; RBL26 BS 827+4; RBL26 BS 827+6; RBL26 BS 827+9; RBL26 BS 827+12; RBL21 BS 827+19. CORROSION ON AFT CARGO BAY THRESHOLD AT RBL 26 BS 787+16-807 RBL 26 BS 807+5 RBL 26 BS 807+7-807+10 RBL 26 BS 807+14-807+18 RBL 26 BS 827+4 RBL 26 BS 827+6 RBL 26 BS 827+9 RBL 26 BS 827+12 RBL 21 BS 827+19. / [01] EVALUATED CORROSION AT ALL LOCATIONS; FOUND DEEPEST LOCATION TO BE AT BS 807+18 REMOVED 0.015' IN A AREA OF 1'X1' ORIGINAL THICKNESS 0.045' FOUND TO BE OUT OF LIMITS PER SRM 53-60-15-1A-1 USING ATS TOOL ID ATS2678 EXP 4/2023;[02] VERIFIED CORRECTIVE ACTION 1<BR>VERIFIED MEASUREMENTS TABLE;[03] REMOVED DAMAGED AFT CARGO BAY THRESHOLD WEB BS794-BS 847 IAW SRM 51-40-02-0G-0;[04] BEGAN TO DRILLING AFT CARGO BAY THRESHOLD WEB BS794- BS847 IAW SRM 51-40-05-0G; DWG 146A8120 AND 146A8340;[05] LOCATED AND DRILLED NEW AFT CARGO BAY THRESHOLD WEB BS794- BS847 IAW SRM 51-40-05-0G; DWG 146A8120 AND 146A8340<BR>OK TO INSTALL;[06] CORRECTIVE ACTIONS 4 & 5 PERFORMED IAW SRM 51-40-05-0G-0; DWG 146A8120 AND 146A8340.;[07] VERIFIED CORRECTIVE ACTIONS 3-6;[08] INSTALLED AFT CARGO BAY THRESHOLD WEB BS794- BS847 IAW SRM 51-40-02-0G; DWG 146A8120 AND 146A8340.;[09] INSTALLED AFT CARGO BAY THRESHOLD WEB BS794- BS847 IAW SRM 51-40-02-0G-0; DWG 146A8120 AND 146A8340.;[10] VERIFIED CORRECTIVE ACTIONS STEP 9.

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