Service difficulty report · Stringer · Boeing 7377H4

Difficulty date
June 23, 2022
Submitted
July 29, 2022
Operation
Air carrier
Aircraft
N428WN
Make and model
Boeing 7377H4
Aircraft serial
29844
Aircraft time
66,134 hours, 39,057 cycles
Part
Stringer
Condition
Cracked
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

FORWARD PASSENGER COMPARTMENT STR. 15L CRACKED AT FASTENER HOLE B.S. 460+16. (51-004) / [01] REMOVED FASTENER FOR ACCESS NDT REF B-737-700 SRM 51-40-02-0G-0;[22] FABRICATED SPLICED AND SHIM AT FWD PASSENGER COMP STR 15 L AFT STA 460+ 16'IAW B737 SRM 53-00-03-2R-1.;26] STARTED DRILLING NEW STRINGER SECTION (STR 15 L AFT SECTION ) STA 460 +16 AS PER B737-700 SRM 53-00-03-2R-1;[27] PERFORMED HARDNESS TEST POST AGING PER BAC 5946; HARDNESS NEEDED 86.5 TO 91.5; HARDNESS IS 87; HARDNESS TEST PASSED. TOOL USED ROCKWELL HARDNESS TESTER; B/C 173831; CAL DUE 05/23;[28] LATE ENTRY : PERFORMED HEAT TREATMENT PROCESS ON NEW STRINGER SECTION (15 LT - AFT ) AS PER BAC5602.;[29] LATE ENTRY: VERIFIED STEPS 16; 17; 21; 22; 26 & 28.;[30] FABRICATION OF REPAIR PARTS ( SPLICE; STRINGER AND SHIMS) AS PER SRM 53-00-03-2R-1 FIGURE;[31] VERIFIED STEP 30<BR>OK TO TREAT AND PRIME FABRICATED PARTS;[32] TREATED AND PRIMED REPAIR PARTS AS PER SRM 51-20-01-0G-0.;[33] VERIFIED TREAT AND PRIME <BR>OK TO INSTALL FABRICATED PARTS;[34] MIXED SEALANT 0870C080BM654SK AT 7-12-2022 8:00 AM SQUEEZE OUT TIME 7-15-2022 4:00 PM;[35] INSTALLED REPAIR PARTS REF B-737-700 SRM 51-40-02-0G-0; SRM 53-00-03-2R-1;[36] INSTALLED CLIP AT STA 460+16 S-15L REF B-737-700 SRM 51-40-02-0G-0;[37] REMOVED CLIP AT STA 460+16 S-15L REF B-737-700 SRM 51-40-02-0G-0;[38] STEP #37 WAS ENTERED IN ERROR. IT SHOULD READ REMOVED EWIS PROTECTION AS PER AMM 20-60-07-913-801.;[39] VERIFIED STEPS 34 TO 38

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