Service difficulty report · Support Channel · Boeing 7377H4

Difficulty date
July 29, 2021
Submitted
September 14, 2021
Operation
Air carrier
Aircraft
N491WN
Make and model
Boeing 7377H4
Aircraft serial
33867
Aircraft time
53,758 hours, 31,898 cycles
Part
Support Channel
Condition
Corroded
Location
Bs 260-269
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 UPPER SURFACE OF INTERCOSTAL SUPPORT CHANNEL ALONG EDGES; AROUND FASTENER HOLES AND LIGHTENING HOLE; BS 260 THROUGH BS 269.5; WL 280.1; LBL 4 THROUGH RBL 4. ; / [01] DISCREPANCY HAS WL280.1 LISTED; ACTUAL LOCATION IS AT WL208.1; NO FURTHER ACTION REQUIRED.; [02] REMOVED DAMAGE ON SUPPORT CHANNEL BS259-BS270 RBL4-LBL4 WL208 ORIG MAT THICKNESS IS 0.040 REMAINING MAT THICKNESS IS 0.032 PART TO BE REPLACED DUE TO LOSS OF MATERIAL ON CUST CARD TTG8Q005ZLUC ALL I.A.W SRM 53-10-51-1A-1 ALLOWABLE DAMAGE 1 PAR 4.B(2)(2)DETAIL C;E; [03] VERIFIED SUPPORT CHANNEL IS OUT OF LIMITS AND WILL BE REPLACED ON CUST CARD TTG8Q005ZLUC

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