Service difficulty report · Angle · Boeing 7377H4

Difficulty date
June 15, 2022
Submitted
July 25, 2022
Operation
Air carrier
Aircraft
N478WN
Make and model
Boeing 7377H4
Aircraft serial
33989
Aircraft time
60,197 hours, 35,659 cycles
Part
Angle
Condition
Corroded
Location
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* FWD CABIN LT SIDE INNER CORD FROM STA 294.5+6 TO STA 344+8 WL 208.1 HAS CORROSION AS MARKED. 124-050 / [01] RE-INSPECTED AREA FOUND EXFOLIATION CORROSION AT FWD CABIN LT SIDE INNER CHORD FROM STA 294.5+6' TO STA 344+8' AS PER REF B737-700 SRM 53-10-51-1A-1;[02] REMOVED EXFOLIATED INNER CHORD AT FWD CABIN LT SIDE FROM STA 294.5+6' TO STA 344+8' IAW SRM 51-40-02-0G-0.;[03] LOCATED AND DRILLED NEW L1 INNER CHORD ANGLE (PO#1684224) IAW B737-700 SRM 51-40-05-0G-0 AND DWG#141A8110.;[04] OK TO TREAT AND PRIME HOLES AND COUNTERSINKS;[05] TREATED AND PRIMED DRILLED HOLES AND COUNTERSINK SECTIONS IAW B737-700 SRM 51-20-01-0G-0.;[06] VALIDATED STEPS 3 & 5;[07] [LATE ENTRY] VALIDATED STEP 2;[08] MIXED BMS 5-95 AT 18:00; 6/18/22. SQUEEZE OUT TIME BY 02:00; 6/22/22.;[09] PARTIALLY INSTALLED L1 INNER CHORD ANGLE FROM STA 294.5+6' TO STA 344+8' IAW SRM 51-40-02-0G-0 AND DWG#141A8110.;[10] INSTALLED NEW L1 INNER CHORD ANGLE FROM STA 294.5+6' TO STA 344+8' IAW SRM 51-40-02-0G-0 AND DWG#141A8110.;[11] REMOVED AND REPLACED L1 INNER CHORD ANGLE FROM STA 294.5+6' TO STA 344+8' IAW SRM 51-40-02-0G-0 AND DWG#141A8110.;[12] [LATE ENTRY] OK TO INSTALL L1 INNER CHORD ANGLE FROM STA 294.5+6' TO STA 344+8';[13] VERIFIED AND INSPECTED STEP#8; #9; AND #10;[14] VERIFIED AND INSPECTED;[15] VERIFIED AND INSPECTED STEP#11

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