Service difficulty report · Skin · Boeing 73779P

Difficulty date
July 27, 2021
Submitted
August 20, 2021
Operation
Air carrier
Aircraft
N7860A
Make and model
Boeing 73779P
Aircraft serial
29362
Aircraft time
44,729 hours, 31,068 cycles
Part
Skin
Condition
Cracked
Location
Nr 2 Fan Cowl
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

#2 ENG. O/B FAN COWL SKIN HAS A CRACK AT AFT UPPER EDGE AREA. ; / CUT OUT CRACKED AREA AND REMOVED EXISTING FASTENERS ARUOUND DAMAGED AREA PER B737-700 SRM 51-10-02-0G-0 AND SRM 51-40-02-0G-0.VERIFIED; [03] PERFORMED HFEC INSP ON CUT OUT AREA. IAW B 737 NDT PART 6 51-00-00 PROCE 23. TOOL USED NORTEC 600. BC 166316. CALIB DUE OCT-1-21. NO CRACKS FOUND.; [04] PERFORMED HFEC ROTO INSP ON DENT. IAW B 737 NDT PART 6 51-00-00 PROCE 16. TOOL USED NORTEC 600. BC 166316. CALIB DUE OCT-1-21. NO CRACKS FOUND.; [05] PERFORMED HFEC COUNTERSUNK INSP ON FASTENER OPEN HOLES. IAW B 737 NDT PART 6 53-30-00 PROCE 3. TOOL USED NORTEC 600. BC 166316. CALIB DUE OCT-1-21. NO CRACKS FOUND.; ACCOMPLISHED DVI OF REPAIR AREA NO DEFECTS FOUND INTERNAL AND EXTERNAL; [0FABRICATED REPAIR PARTS AS REF. B737-700 SRM 54-20-01-2R-13 REPAIR 13 AND EA 21-171-02193 WIP1 MATERIAL USED 2024-T3 .071' PO#1730245; 2024-T3 .080' PO#1719452 PENDING HEAT TREATMENT HEAT TREATED REPAIR PARTS TO T81 AS REF. B737-700 SRM 54-20-01-2R-13 AND BAC 5602 OK TO INSTALL REPAIR PART FINISHED INSTALLATION OF REPAIR PARTS AT O/B FAN COWL ENG.#2( AFT UPPER EDGE AREA) AS REF. B737-700 SRM 51-40-02-0G-0 AND EA 21-171-02193; [18] APPLIED FILLER SEAL AT REPAIR DOUBLER AS REF. B737-700 AMM 51-31-00-390-804 OK TO APPLY TOP COAT PROTECTION; TOP COATED REPAIR DOUBLER AS REF. B737-700 AMM 51-21-73-370-803 ACCOMPLISHED # 2 ENGINE FAN COWLING SKIN REPAIR AS INSTRUCTED ON EA 21-171-02193

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