Service difficulty report · Channel · Boeing 7377H4

Difficulty date
July 28, 2021
Submitted
September 15, 2021
Operation
Air carrier
Aircraft
N447WN
Make and model
Boeing 7377H4
Aircraft serial
33720
Aircraft time
58,733 hours, 34,620 cycles
Part
Channel
Condition
Corroded
Location
Bs 952-987
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 MOP SILL AT AFT WET AREA BS 952 TO BS 987 LBL 49 WL 208 ; / [01] REMOVED AND EVALUATED CORROSION AT DISCREPANCY AREA. L=1' W=1.5. ORIGINAL THICKNESS 0.080' REMAINING 0.067' LOSS= 0.013' BLEND LOCATION FOUND TO BE OUT OF LIMITS PER SRM 53-70-15-1A-1 STEP 4. D. (2) (A) FIGURE 103; DETAIL E. <BR><BR>DIAL DEPTH GAGE<BR>ID: ATS1225<BR>S/N: UNKNOWN<BR>DATE: 07/2021<BR>DUE: 07/2022; [02] VERIFIED CORRECTIVE ACTION #1<BR> FOUND TO BE OUT OF LIMITS PER SRM 53-70-15; [03] REMOVED MOP SILL AT AFT WET AREA BETWEEN BS 917 TO BS 1006 L/H LBL 49 WL 208 PER SRM 51-40-02; [04] LOCATED AND DRILLED AED MOPSILL PN#147A8540U7; PO#828380 IAW SRM 51-40-05 AND IAW DWG#147A8501. OK TO INSTALL; [05] VERIFIED LOCATED AND DRILLED AED MOPSILL PN#147A8540U7; PO#828380 IAW SRM 51-40-05 AND IAW DWG#147A8501 OKAY TO INSTALL MOPSILL; [06] PARTIALLY INSTALLED AED MOP SILL BS 887+7 TO BS 987 LBL 49 WL 208 IAW SRM 51-40-02-0G-0 AND DWG# 147A8501; [07] VERIFIED PARTIAL INSTALLATION OF AED MOP SILL BS 887+7 TO BS 987 LBL 49 WL 208 IAW SRM 51-40-02-0G-0 AND DWG# 147A8501; [08] INSTALLED MOP SILL AT AFT WET AREA BETWEEN BS 887 TO BS 1016 L/H SIDE LBL49 WL 208 PER SRM 51-40-02 AND DWG 147A8501; [09] RII INSPECTED GOOD INSTALLATION OF MOP SILL PER SRM 51-40-02 AND DWG 147A8501.; [10] ALL ITEMS ARE COMPLETE; [11] CARD COMPLETE; [12] VERIFIED CARD COMPLETE

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