Service difficulty report · Web · Boeing 737752

Difficulty date
July 21, 2023
Submitted
August 17, 2023
Operation
Air carrier
Aircraft
N7887A
Make and model
Boeing 737752
Aircraft serial
35123
Aircraft time
50,547 hours, 26,200 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 BS807 - BS827 RBL26 WL159.<[01] VERIFIED SRM 53-60-15-0I-1 FOR IDENTIFICATION AND SRM 53-60-15-1A-1 FOR ALLOWABLE DAMAGE.;[02] STEPS 1 AND 2 FOUND TO BE OUT OF LIMITS.;[03] VERIFIED CORRECTIVE ACTION 1 COMPLETE AND UPDATED STEPS 1 & 2;[04] REMOVED SUBTHRESHOLD WEB<BR>AT ACB BS 797 TO BS 847 RBL 26 WL 159<BR>IAW SRM 51-40-02;[05] LOCATED AND DRILLED NEW FWD CARGO BAY SUBTHRESHOLD WEB<BR>AT RBL 26 WL 159 BS 797- TO BS 847 P/N 146A8123-25<BR>IAW SRM 51-40-05-0G-0 AND DWG 146A8340.;[06] REQUIRE TOP COAT;[07] VERIFIED CORRECTIVE ACTION STEPS 4-6. VERIFIED OK TO APPLY TOPCOAT.;[08] APPLIED TOPCOAT OF BMS10-11 TYPE II ENAMEL <BR>ON SUBTHRESHOLD WEB AT ACB BS 797 TO BS 847 WL 159<BR>IAW AMM 51-21-73-370-804<BR>REQUIRE TO APPLY CIC;[09] VERIFIED CORRECTIVE ACTION STEP 8.;[10] APPLIED CORROSION INIBITHING COMPOUND ON SUBTHERESHOLD WEB ACB IAW SRM 51-20-01.<BR>OK TO INSTALL;[11] VERIFIED OK TO INSTALL.;[12] INSTALLED SUBTHRESHOLD WEB AT ACB<BR>BS 797 TO BS 847 RBL 26 WL 159<BR>IAW SRM 51-40-02 AND DWG. 146A8340<BR>ALL WORKS COMPLETED;[13] VERIFIED CORRECTIVE ACTION #12 AND MEASUREMENT TABLE<BR>REJECTED SEE FAULT TTG8Q00MJNK3