Service difficulty report · Stringer · Boeing 7377BD

Difficulty date
January 25, 2022
Submitted
April 4, 2022
Operation
Air carrier
Aircraft
N7730A
Make and model
Boeing 7377BD
Aircraft serial
33926
Aircraft time
51,354 hours, 27,779 cycles
Part
Stringer
Condition
Cracked
Location
Fwd Cargo
Stage of operation
UK
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

CRACKED STRINGER AT AREA AFT OF FCB BS540 S-26L WL153. MARKED / [01] VERIFIED APPLICABILITY OF SRM 53-00-03-2R-1 TO BE CORRECT AND UPDATED MEASUREMENT TABLE;[02] REMOVED DAMAGED STRINGER SECTION FCB BS500D+10 TO BS540 STR-26L WL153; AND PERFORMED VISUAL INSPECTION ON REPAIR AREA IN NOT ADITIONAL DAMAGE NOTED; IAW SRM 53-00-03-2R-1 PAR 4A-B1;[03] VERIFIED REMOVED DAMAGED STRINGER SECTION FCB BS500D+10 TO BS540 STR-26L WL153; AND PERFORMED VISUAL INSPECTION ON REPAIR AREA IN NOT ADITIONAL DAMAGE NOTED; IAW SRM 53-00-03-2R-1 PAR 4A-B1;[04] HFEC INSPECTED CUT EDGE IAW 737 NDTM PART 6 51-00-00 PROCEDURE 23; NO CRACKS NOTED. EQUIP USED: NORTEC 600 ID: ATS1465<BR><BR><BR>HFEC INSPECTED OPEN HOLES IAW 737 NDTM PART 6 51-00-00 PROCEDURE 16; NO CRACKS NOTED. <BR>EQUIP USED: NORTEC 600 ID: ATS1465 EQUIP USED: MINIMITE ID: ATS240;[05] RECEIVED FROM OSS STRINGER REPAIR SECTION FOR STR REPAIR 26L BS 540 WL 153 FABRICATED FROM 7075 T0 .036 LOT# 1451783 HEAT TREATED TO T6 CONDITION ON SWA PO 854234 DATED 28 JAN 22 RECEIVED FROM OSS REPAIR HAT SECTION FABRICATED FROM 7075 T0 .040 LOT# 1430173-1 HEAT TREATED TO T6 CONDITION ON SWA PO 854236 DATED 27 JAN 22;[06] VERIFIED CORRECTIVE ACTION 5.;[07] TRIMMED LOCATED AND DRILLED NEW STRINGER AND HAT REPAIR SECTIONS FOR REPAIR AT BS 540 STR 26L WL 153 APPLIED CHEMICAL CONVERSION COAT TO REPAIR PARTS AND REPAIR AREA ALL IAW SRM 53-00-03-2R-1 REPAIR 1 STEPS 4 D; E; F; G; H AND I AND SRM 51-40-05-0G-0 OK TO PRIME;[

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