Service difficulty report · Sidewall 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
Sidewall 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 - SIDEWALL SUPPORT HAS CORROSION WL 156 - LBL 24.75 BS 500+4; BS 500+5; BS 500+10; BS 500+14; BS 500+18; BS 500A+6. BS 500A+10; BS 500A+14.<[01] MEASURMENT UPDATE AND VERIFY APPLICABILITY OF SRM 53-00-53-1A-2.;[02] REMOVED CORROSION FROM WL 156 - LBL 24.75 BS 500 +4 TO BS 500A +14. LARGEST AREA OF DAMAGE AT BS 500 + 5' MEASURED 0.900'L X 0.700'W AND 0.005; ORIGINAL THICKNESS OF 0.040' FOUND TO BE OUT OF LIMITS PER SRM 53-00-53-1A-2.;[03] CAL ID DIAL DEPTH GAUGE NCX000697<BR> S/N UNKNOWN<BR> DUE 09/2023;[04] VERIFIED CORRECTIVE ACTION 1-3 AND MEASUREMENT TABLE;[05] FLOOR TO SIDEWALL SUPPORT AT THIS LOCATION TO BE REPLACED ON CUST ID: TTG8Q00JDZNG.<BR>FLOOR TO SIDEWALL SPLICE IS LOCATED BETWEEN STA 480 TO STA 500.;[06] UPDATED MEASUREMENT TABLE;[07] VERIFIED CORRECTIVE ACTIONS 5 AND 6

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