Service difficulty report · Support Frame · Boeing 7377H4

Difficulty date
June 22, 2021
Submitted
August 4, 2021
Operation
Air carrier
Aircraft
N417WN
Make and model
Boeing 7377H4
Aircraft serial
29822
Aircraft time
65,751 hours, 38,956 cycles
Part
Support Frame
Condition
Cracked
Location
Bs 312
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 CABIN FUSELAGE SUPPORT FRAME FLANGE SMALL CRACK @ STA 312 ABOVE L-1 DOOR CUTOUT FWD MKD DOT ; / [09] LOCATED AND DRILLED REPAIR ANGLE AT FWD CABIN FUSELAGE SUPPORT FRAME AT STA 312 ABOVE L-1 DOOR IN IAW SRM 51-40-05-0G-0; [10] HEAT TREATED REPAIR ANGLE FROM 7075-O TO 7075-T6 CONDITION PER BAC 5602. HEAT TREATMENT DOCUMENTS ATTACHED TO FAULT.; [11] PERFORMED FPI ON REPAIR ANGLE; IAW B 737 SOPM 20-20-02. NO CRACKS FOUND.; [12] VERIFIED 7-10. OK TO TREAT AND PRIME. OK TO INSTALL DOUBLER.; [13] TREATED WITH ALODINE AND PRIMED DOUBLER REPAIR IN IAW SRM 51-20-01-0G-0; [14] VERIFIED ALODINE PRIMER; [15] INSTALLED REPAIR PART IAW. B-737-700 SRM 53-10-07-2R-1; [16] VERIFIED REPAIR INSTALLATION OK RII; [17] FABRICATED AND INSTALLED FUSELAGE SUPPORT FRAME REPAIR AT FWD CABIN ABOVE L-1 DOOR STA. 312 IAW. B-737-700 SRM 53-10-07-2R-1 REPAIR 1;

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