Service difficulty report · Stringer · Boeing 7377H4

Difficulty date
July 18, 2023
Submitted
August 7, 2023
Operation
Air carrier
Aircraft
N411WN
Make and model
Boeing 7377H4
Aircraft serial
29821
Aircraft time
72,372 hours, 43,147 cycles
Part
Stringer
Part number
UNKNOWN
Condition
Cracked
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 - CRACK ON STRINGER 24L BS 540 (MARKED)<[01] VERIFIED APPLICABILITY IAW SRM 53-30-03-01-1 AND SRM 53-00-03-1A-1;[02] THERE IS NO ALLOWABLE DAMAGE FOR FCB STRINGER CRACK AT BS 540 24L IAW SRM 53-00-03-1A-1. PART TO BE REPAIRED BY REPLACEMENT IAW SRM 53-00-03-2R-1;[03] REMOVED FWD WTB FAIRING PNL 191CL IAW AMM 53-51-21-000-803;[04] VERIFIED CORRECTIVE ACTIONS 1 AND 2.;[05] VERIFIED APPLICABILITY FOR STR 24L/H IAW SRM 53-00-03-2R-1 PAR 4. FIG 205;[06] CUTOUT AND REMOVED DAMAGE STRINGER SECTION BETWEEN BS 500D+12' TO BS 539 ON STR 24L IAW SRM 53-00-03-2R-1 PAR 4;STEPS A-B.LOCATED AND DRILLED NEW STRINGER SECTION AT FCB STR 24L/H BETWEEN BS 500D+12' TO BS 539 AND HAT SECTION BETWEEN BS 500D+5' TO BS 500D+19' AND APPLIED CHEMICAL CONVERSION COATING ON REPAIR PARTS IAW SRM 53-00-03-2R-1 PAR 4;STEPS D - I; FIG 205; ;APPLIED PRIME ON REPAIR PARTS IAW SOPM 20-41-02. REQUEST OK TO INSTALL REPAIR PARTS.;[17] VERIFIED APPLICATION OF PRIME ON REPAIR PARTS; ONLY.;[18] REQUEST OKAY TO INSTALL STRINGER REPAIR.;COMPLETED INSTALLATION OF REPAIR PARTS IAW SRM 53-00-03-2R-1; PARA 4K-L <BR>PARTIAL ON STEP 2; 3; 4;REJECTED STEP 3 OK TO INSTALL LANDING LIGHT DUE TO FOD AND CREATED STEP 5.;[24] COMPLETED STEP 5;[25] REQUEST OK TO INSTALL L/H RETRACTABLE LANDING LIGHT.;[26] INSTALLED L/H RETRACTABLE LANDING LIGHT PER AMM 33-42-02-960-802 INSTALLED PNL 191CL.; L/H RETRACTABLE LANDING LIGHT OPS CHECKED GOOD PER AMM 33-42-02-960-802.;[35] VERIFIED CORRECTIVE ACTION 34

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