Service difficulty report · Structure · Boeing 7377H4

Difficulty date
March 9, 2023
Submitted
April 17, 2023
Operation
Air carrier
Aircraft
N220WN
Make and model
Boeing 7377H4
Aircraft serial
32491
Aircraft time
58,003 hours, 34,631 cycles
Part
Structure
Condition
Corroded
Location
Zn 200 Fus Top
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 SPOTS AT LOWER MAIN SILL ASSY L2 DOOR INNER CHORD<[01] FOUND DEEP CORROSION EXFOLIATION AT L2 DOOR LOWER SILL INNER CHORD BETWEEN STA 951 AND STA 986. FOUND OUT OF LIMITS AS PER SRM 53-70-15-1A-1;[02] STARTED L2 DOOR LOWER SILL INNER CHORD REMOVAL AS PER SRM 51-40-02-0G-0<BR>PERFORMED BY O.P 4041;[03] ACCOMPLISHED L2 DOOR LOWER SILL INNER CHORD REMOVAL AS PER SRM 51-40-02-0G-0<BR>PERFORMED BY O.P 4041;[04] VERIFIED AND INSPECTED STEP #1; #2 AND #3.;[05] STARTED LOCATE AND DRILL OF NEW L2 DOOR INNER CHORD AS PER REFERENCE SRM 51-40-05-0G-0.;[06] CONTINUED LOCATE AND DRILL OF NEW L2 DOOR INNER CHORD AS PER REFERENCE SRM 51-40-05-0G-0.;[07] ACCOMPLISHED LOCATE AND DRILL OF NEW L2 DOOR INNER CHORD AS PER REFERENCE SRM 51-40-05-0G-0.;[08] TREATED AND PRIMED COUNTERSUNK HOLES AS PER REFERENCE AMM 51-21-41-370-803 AND 51-21-72-370-804;[09] VERIFIED AND INSPECTED STEP #5; #6; #7 AND #8.;[10] OK TO INSTALL NEW INNER CHORD.;[11] MIXED SEALANT BMS 5-95 AT 12:00AM 3-17-2023; SQUEEZE OUT AND FASTENER INSTALLATION VERIFICATION DUE BY 8:00AM 3-20-2023;[12] STARTED INSTALLATION OF NEW L2 DOOR INNER CHORD AS PER REFERENCE SRM 51-40-02-0G-0;[13] CONTINUED INSTALLATION OF NEW L2 DOOR INNER CHORD AS PER REFERENCE SRM 51-40-02-0G-0 AND DGW 147A8501;[14] ACCOMPLISHED INSTALLATION OF NEW L2 DOOR INNER CHORD AS PER REFERENCE SRM 51-40-02-0G-0 AND DGW 147A8501;[15] VERIFIED STEPS 11; 12; 13 AND 14.

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