Service difficulty report · Sill Drain · Boeing 7377H4

Difficulty date
July 6, 2023
Submitted
August 9, 2023
Operation
Air carrier
Aircraft
N965WN
Make and model
Boeing 7377H4
Aircraft serial
36677
Aircraft time
38,362 hours, 23,630 cycles
Part
Sill Drain
Part number
UNKNOWN
Condition
Corroded
Location
Zn 200 Fus Top
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 FSD MOP SILL BS294+7; BS326 - BS346 RBL56 WL208.<[01] VERIFIED APPLICABILITY OF SRM 53-10-15-1A-2;[02] REMOVED CORROSION ALONG FSD MOP SILL <BR>AT RBL56; WL208 BS 291.5 + 11' - BS312 + 10' L:20' X W:1'; REMOVED CORROSION ALONG FSD MOP SILL AT RBL56; WL208; BS328 + 2'; L: 2 X W:1' D: 0.002' FROM ORIGINAL THICKNESS IS 0.080' FOUND WITHIN LIMITS PER SRM 53-10-15-1A-1 FIG. 103 DETAIL D.;[08] REMOVED CORROSION ALONG FSD MOP SILL AT RBL56; WL208; BS 291.5 + 11' - BS312 + 10' L:20' X W:1'; D: 0.005' FROM ORIGINAL THICKNESS IS 0.080' REMOVED MATERIAL AROUND THAN MORE THREE FASTENERS IN ALL GROUPS OF TEN; FOUND WITHOUT LIMITS PER SRM 53-10-15-1A-1 FIG. 103 DETAIL G. DAMAGE IS BEYOND LIMITS DUE TO REMOVED MATERIAL AROUND THAN MORE THREE FASTENERS IN ALL GROUPS OF TEN; FOUND WITHOUT LIMITS PER SRM 53-10-15-1A-1 FIG. 103 DETAIL G. DAMAGE IS BEYOND LIMITS DUE TO REMOVED MATERIAL AROUND THAN MORE THREE FASTENERS IN ALL GROUPS OF TEN; FOUND WITHOUT LIMITS PER SRM 53-10-15-1A-2 FIG. 103 DETAIL G.;[11] HFEC ROTARY INSPECTED OPEN HOLES IN BLENDED AREA PER 737NDT PART 6 51-00-00 PROCEDURE 16. NO CRACKS FOUND. TOOL N500 IS000681 DUE 04/2024.;[12] UT INSPECTED BLENDED AREA IAW 737 NDTM PART 4; 51-00-00 PROCEDURE 2.<BR>REMAINING MATERIAL THICKNESS IS 0.074' ADJACENT TO 0.080'. <BR>SEE ATTACHED GRID.<BR>EQUIP USED: <BR>-EPOCH 650 ID: ATS2342 CAL DUE: 07/23;[13] COMPLETE;[14] VERIFIED MEASUREMENT TABLE AND CORRECTIVE ACTION 13

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