Service difficulty report · Skin · Boeing 73776Q

Difficulty date
April 15, 2023
Submitted
May 9, 2023
Operation
Air carrier
Aircraft
N551WN
Make and model
Boeing 73776Q
Aircraft serial
30280
Aircraft time
66,624 hours, 41,198 cycles
Part
Skin
Condition
Debonded
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

PANEL 191FR OUTER SKIN IS DISBONDED. (MARKED)<[01] IDENTIFIED PANEL 191FR IAW SRM 53-30-70-0I-1; FIGURE 2; SHEET 1; TABLE 2; ITEM 4.<BR><BR>CLEANED PANEL FOR EVALUATION IAW AMM 51-21-11-150-815 PARA 17. C.<BR><BR>VISUALLY EXAMINED DAMAGE AND TAP TESTED WITH DISBOND NOTED IAW SRM 53-30-70-1A-1 PARA 2. A. (1) (A) THAT EXCEEDS ALLOWABLE LIMITS PER SRM 53-30-70-1A-1 PARA 4. B. (6).<BR> <BR>REPAIR TO BE PERFORMED IAW SRM 51-70-05-2R-2 AS GIVEN IN SRM 53-30-70-2R-1 TABLE 201.<BR><BR>REPAIR WILL BE ACCOMPLISHED IAW SRM 51-70-05-2R-2 IAW SRM 53-30-70-2R-1 PARA 4.D. AND TABLE 201.<BR><BR>REMOVE 1' DIA AREA OF OUTER SKIN AND FULL DEPTH CORE THEN CLEANED AND PREPARED REPAIR AREA WITH NO MOISTURE OR CONTAMINATION NOTED IAW SRM 51-70-05-2R-2 PARA 4. A. - C.;[04] APPLIED POTTING BMS 5-28 TY7 LOT#AK1AP8072K AND CURED UNDER HEAT LAMP USING THERMOMETER ID:ATS2209 DUE:10/23; SANDED POTTING SMOOTH; AND CLEANED REPAIR AREA IAW SRM 51-70-05-2R-11 PARA 4.A-E<BR><BR>FABRICATED REPAIR PLIES OUT OF BMS 8-79 CL3 ST120 LOT#1520138-1; AND BMS 5-129 TY2 GR05 LOT#1521552-3. INSTALLED REPAIR PLIES; VACUUM BAGGED; LEAK CHECK GOOD USING VACUUM GAUGE ID:ATS2441 DUE:08/23 IAW SRM 51-70-05-2R-2 PARA 4.D(NOTE)G AND H. <BR>REPAIR PLIES NEED CURE.[10] POST REPAIR UT INSPECTED PER 737NDT PART 4 51-00-02. NO DEFECTS FOUND. TOOL S650 ATS2341 DUE 06/2023.;[11] REFINISHED REPAIR AREA IAW SRM 51-70-05-2R-2 PARA 4.K;[12] VERIFIED CORRECTIVE ACTION 11

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