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 963-994 Rbl46
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 963 TO BS 994 RBL 46 WL 208 ; / [01] REMOVED AND EVALUATED CORROSION AT DISCREPANCY AREA. L=1' W=1.5. ORIGINAL THICKNESS 0.080' REMAINING 0.064' LOSS= 0.016' 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 R/H RBL 46 WL 208 PER SRM 51-40-02; [04] LOCATED AND DRILLED MOP SILL AT AFT WET AREA BETWEEN BS 917 TO BS 1006 RBL 46 WL208 PER SRM 51-40-05 AND DWG 147A8501 OK TO INSTALL PART; [05] VERIFIED LOCATED AND DRILLED PER SRM 51-40-05 AND DWG 147A8501. OK TO INSTALL; [06] INSTALLED NEW MOP SILL AT AFT WET AREA BETWEEN BS 917 TO BS 1016 RBL 46 WL 208 PER SRM 51-40-02 AND DWG 147A8501; [07] RII INSPECTED GOOD INSTALLATION OF NEW MOP SILL PER SRM 51-40-02 AND DWG 147A8501; [08] ALL ITEMS ARE COMPLETE; [09] CARD COMPLETE; [10] UPDATED PART REQUIREMENTS AND MEASUREMENTS; [11] UPDATED MEASUREMENTS; [12] VERIFIED ALL STEPS COMPLETE

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