Service difficulty report · Channel · Boeing 7377H4

Difficulty date
March 17, 2022
Submitted
April 20, 2022
Operation
Air carrier
Aircraft
N472WN
Make and model
Boeing 7377H4
Aircraft serial
33831
Aircraft time
58,559 hours, 34,804 cycles
Part
Channel
Condition
Corroded
Location
Fwd Fuselage
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 FORWARD LAVATORY FLOOR SUPPORT CHANNEL AT B.S. 277 - B.S. 294.5; L.B.L. 11; W.L. 208.1. / [01] REMOVED CORROSION ON FWD LAVATORY FLOOR SUPPORT CHANNEL BS 277-294.5 LBL11 WL 208.1 AREA OF 2'X2'X.030' ORIGINAL THICKNESS .188 FOUND TO BE OUT OF LIMITS I.A.W SRM 53-10-51-1A-1 DETAIL 4.B FIG 105 C <BR>TOOL USED DIAL DEPTH GAGE I.D ATS 2677 S/N UNKNOWN;[02] INSPECTED & VERIFIED CORRECTIVE ACTION ITEM 1.;[03] REMOVED ON FORWARD LAVATORY FLOOR SUPPORT CHANNEL AT BS 277 BS 294.5 LBL 11 WL 208.1 IAW SRM 51-40-02;[04] RECEIVED ON FORWARD LAVATORY FLOOR SUPPORT CHANNEL AT BS277-BS294.5 LBL11 WL208.1. ITEM141A5650U3 PO#861050. LOCATED AND DRILLED IAW SRM 51-40-05 AND DWG141A5600.<BR>OK TO INSTALL;[05] VERIFIED CORRECTIVE ACTIONS 3-4. VERIFIED REMOVAL OF DAMAGED 'CHANNEL' (INTERCOSTAL) AND LOCATING/DRILLING AND OK TO INSTALL REPLACEMENT INTERCOSTAL.;[06] INSTALLED ON FORWARD LAVATORY FLOOR SUPPORT CHANNEL AT BS 277-BS294.5 LBL11 WL208.1 IAW SRM 51-40-02 AND DWG141A5600;[07] VERIFIED CORRECTIVE ACTION 6

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