Service difficulty report · Web · Boeing 7377H4

Difficulty date
March 17, 2023
Submitted
April 24, 2023
Operation
Air carrier
Aircraft
N957WN
Make and model
Boeing 7377H4
Aircraft serial
41528
Aircraft time
38,518 hours, 23,626 cycles
Part
Web
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

AFT CARGO COMPARTMENT - CARGO DOOR THRESHOLD WEB HAS MULTIPLE AREA OF CORROSION AT BS 787+7 TO BS 847 RBL 26 WL 162<[01] VERIFIED APPLICABILITY OF SRM 53-60-15-1A-1 ALLOWABLE DAMAGE 1;AND SRM 53-60-15-0I-1 IDENTIFICATION 1.;[02] EVALUATED CORROSION REMOVAL FROM ACB;THRESHOLD WEB AT RBL26;BS787+7 TO BS847;WL162 MEASURE:L=1.'W=.9'D=.012';ORIGINAL TICKNESS IS 0.045' PER SRM 53-60-15-0I-1 IDENTIFICATION 1;TABLE 4 ITEM [2];REMAINING TICKNESS IS 0.033';FOUND PART TO BE OUT OF LIMITS;REWORKED AREAS PER SRM 53-60-15-1A-1 ALLOWBLE DAMAGE 1;PARAG 4 G(2) DETAIL D FIG 103.TOOL USED ATS:2677;S/N UNKNOWN;DUE:11/2023.;[03] VERIFIED CORRECTIVE ACTION ITEM 1-2; OUT OF LIMITS.;[04] EDITED LINE 17 IN MEASUREMENTS; ACTUAL REMAINING THICKNESS IS 0.033'.;[05] RECEIVED NEW THRESHOLD WEB ON AFT CARGO COMPARTMENT BS 794.37 TO BS 847 RBL26 WL 162 ITEM 146A8123-25 PO#912542. LOCATED AND DRILLED IAW SRM 51-40-05; DWG 146A8123 AND DWG146A8340;[06] VERIFIED CORRECTIVE ACTION #5.;[07] VERIFIED MEASUREMENTS.

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