Service difficulty report · Web · Boeing 73773V

Difficulty date
July 21, 2023
Submitted
August 15, 2023
Operation
Air carrier
Aircraft
N7839A
Make and model
Boeing 73773V
Aircraft serial
30243
Aircraft time
63,332 hours, 39,016 cycles
Part
Web
Part number
UNKNOWN
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 SUBTHRESHOLD WEB AT ACB BS798 - BS838 RBL26 WL160.<FOUND TO BE OUT OF LIMITS IAW SRM 53-60-15-1A-1 A.D.<BR>PARA:4 (G) FIG. 103 DET. A.<BR>USED TOOL: ID: ATS 400 S/N: UNKNOWN DUE DATE: 09/2023;[03] VERIFIED CORRECTION ACTION ITEM 1;2. AND MEASUREMENT TABLE.;[04] REMOVED THRESHOLD WEB ACB;PER SRM 51-40-02<BR><BR>LOCATED AND DRILLED NEW THRESHOLD WEB LOT..# 1522932-1; PER SRM 51-40-05 AND DWG 146A8123.<BR><BR>REQUIRE OK TO PAINT;[05] COMPLETED STEP 2<BR>VERIFIED PARTIAL COMPLETION STEP 3.1<BR>OK TO CHEMICAL CONVERSION COATING AND PRIMER TO THRESHOLD WEB GIVEN;[06] APPLIED CHEMICAL CONVERSION COATING ON SUBTHRESHOLD WEB AT ACB BS798 - BS838 RBL26 WL160 PER REF SRM 51-20-01 AND SOPM 20-41-02 <BR><BR>OK TO INSTALL NEW PART;[07] APPLIED COAT OF BMS10-11 TYPE II ENAMEL ON SUBTHRESHOLD WEB PER AMM 51-21-73-370-804<BR>TIME OF APPLICATION: AT 28-JUL-2023 21:52 UTC;[08] APPLIED CORROSION INHIBITING COMPOUND ON SUBTHRESHOLD WEB PER SRM 51-20-01.<BR>TIME OF APPLICATION: AT 29-JUL-2023 16:04 UTC;[09] VERIFIED COMPLETION OF CORRECTIVE ACTIONS 6-8.<BR>OK TO INSTALL SUBTHRESHOLD WEB ACB GIVEN;[10] REMOVED AND INSTALLED NEW SUBTHRESHOLD WEB AT ACB; PER SRM 51-40-02 AND DWG# 146A8340;[11] PART INFO;[12] VERIFIED CORRECTIVE ACTION 10 AND MEASUREMENT TABLE COMPLETE. CARD COMPLETE.

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