Service difficulty report · Support · Boeing 7377H4

Difficulty date
March 8, 2023
Submitted
April 12, 2023
Operation
Air carrier
Aircraft
N956WN
Make and model
Boeing 7377H4
Aircraft serial
36672
Aircraft time
38,869 hours, 23,696 cycles
Part
Support
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

FWD CARGO BAY - AFT BULKHEAD SIDEWALL SUPPORT HAS CORROSION WL 156 - BS 500C+ 18.5 LBL 1.5; LBL 14.5; LBL 19.5; LBL 22.5; LBL 23.5 / RBL 4; RBL 6.75; RBL 9.75; RBL 14.5; RBL 17; RBL 19; RBL 22; RBL 23<[01] VERIFIED SRM 53-30-08-1A-1 TO BE APPLICABLE.;[02] REMOVED CORROSION AT AREAS DESCRIBED ON FCB AFT BULKHEAD SIDEWALL SUPPORT; AREA AT LBL 22.5 HAS DEEPEST MATERIAL LOSS; L = 1' X W = 0.6' REMAINING THICKNESS = .057' DISTANCE OF DAMAGE LESS THAN 20 X THE REMAINING THICKNESS OF MATERIAL. FOUND DAMAGE TO BE OUT OF LIMITS IAW SRM 53-30-08-1A-1.;[03] CALIBRATED TOOL USED; MICROMETER ATS1671 S/N: 65093024; DUE: 07/2023.;[04] VERIFIED CORRECTIVE ACTIONS 1-3 AND MEASUREMENT TABLE;[05] LOCATED AND DRILLED NEW BULKHEAD SUPPORT IAW SRM CH 51-40-05 AND DRAWING 143A9481.;[06] VERIFIED CORRECTIVE ACTION 5;[07] SIGNED FOR PART;[08] UPDATED MEASUREMENT TABLE;[09] VERIFIED MEASUREMENT TABLE

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