Service difficulty report · Doubler · Boeing 73773V

Difficulty date
July 17, 2023
Submitted
August 15, 2023
Operation
Air carrier
Aircraft
N7839A
Make and model
Boeing 73773V
Aircraft serial
30243
Aircraft time
63,332 hours, 39,016 cycles
Part
Doubler
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

ELECTRICAL GROUND POWER RECEPTICAL LOWER BARE STRAP/SURROUND DOUBLER IS CRACKED<SURROUND DOUBLER HAS A CRACK L=0.95' IN LOWER ZONE A. CRACKS ARE NOT PERMITTED PER SRM 53-10-15-1A-5 PARAGRAPH 4.A (1);[03] SRM 53-10-15-2R-4 REPAIR 4 IS APPLICABLE;[04] VERIFIED CORRECTIVE ACTIONS 1-3. VERIFIED MEASUREMENT TABLE;[05] REMOVED DAMAGE L=1.9' X W=0.5' PER SRM 53-10-15-2R-4 FIGURE 204 ALTERNATIVE 2 ACCOMPLISHED 0.040' INSURANCE CUT OF THE TRIM OUT AREA PER SRM 53-10-15-2R-4 PARAGRAPH 4.C (7);[11] VERIFIED CORRECTIVE ACTION 10 COMPLETE.;[12] ACCOMPLISHED HFEC SURFACE SCAN OF INTERIOR STRUCTURE AROUND CUT EDGE IAW 737 NDTM PART 6 CHAPTER 51-00-00 PROCEDURE 23. NO CRACKS NOTED.<BR><BR>EQUIPMENT USED: NORTEC 600 ID: ATS1465 CAL DUE: 09/2023;[13] FABRICATED; LOCATED AND DRILLED [-2] DOUBLER FROM 2024-T3X 0.050' CLAD SHEET LOT # 1517310-1 AND [-3] FILLER FROM 2024-T3X 0.040' CLAD SHEET LOT # 1531864-1 PER SRM 53-10-15-2R-4 ALTERNATIVE 2; FIGURE 204 AND TABLE 201. OK TO TREAT AND PRIME;[14] VERIFIED CORRECTIVE ACTION 13. OK TO TREAT AND PRIME.;[15] APPLIED CHEMICAL CONVERSION COATING AND PRIMER AT BARE METAL AREAS;-2 & -3 REPAIR PARTS PER SRM 53-10-15-2R-4 PARAGRAPH 4.K;L. OK TO INSTALL.;[16] VERIFIED CORRECTIVE ACTION 15. OK TO INSTALL;[17] INSTALLED REPAIR PARTS PER SRM 53-10-15-2R-4 ALTERNATIVE 2; FIGURE 204;[18] VERIFIED CORRECTIVE ACTION 17 AND MEASUREMENT TABLE COMPLETE. CARD COMPLETE.

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