Service difficulty report · Bulkhead · Boeing 7377H4

Difficulty date
March 2, 2023
Submitted
April 11, 2023
Operation
Air carrier
Aircraft
N956WN
Make and model
Boeing 7377H4
Aircraft serial
36672
Aircraft time
38,869 hours, 23,696 cycles
Part
Bulkhead
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

R/H VAPOR BARRIER BULKHEAD AT BS 663 / RBL 41 / WL 160 IS CRACKED.<[01] IDENTIFIED PANEL IAW SRM 57-10-10-0I-2 FIGURE 2 ITEM [4] AND TABLE 2 ITEM [4]. THE DAMAGE IS BEYOND ALLOWABLE LIMITS IAW SRM 57-10-10-1A-2 PARAGRAPH 4.D.(1) AND WILL BE REPAIRED IAW SRM 51-70-04-2R-10 PER SRM 57-10-10-2R-2 PARAGRAPH 1.C. REMOVED DAMAGE FROM AN AREA LOCATED 25' FROM THE INBOARD EDGE AND 12.5' FROM THE LOWER EDGE AND PREPPED AREA FOR REPAIR WITH NO DISBOND OR CONTAMINATION NOTED; WORK PERFORMED IAW SRM 51-70-04-2R-10 PARAGRAPH 4.A-C.;[02] VALIDATED APPLICABILITY OF SRM 51-70-04-2R-10.;[03] VERIFIED CORRECTIVE ACTION #1; 2;[04] FABRICATED REPAIR PLIES FROM BMS9-3 STYLE 1581 TYPE H-2 LOT NUMBER 1520142-1 IAW SRM 51-70-04-2R-10 PARAGRAPH 4.D. OK TO INSTALL REPAIR PLIES.;[05] VERIFIED CORRECTIVE ACTION #4;[06] INSTALLED PLIES WITH BMS8-301 CLASS 2 LOT NUMBER 1506171-2; VACUUM BAGGED AND VERIFIED A SATISFACTORY 5X5 WITH VACUUM GAUGE; ID: ATS2241 DUE: 08/2023; WORK PERFORMED IAW SRM 51-70-04-2R-10 PARAGRAPH 4.D-E.;[07] VERIFIED CORRECTIVE ACTION #6;[08] CURED PLIES; UNBAGGED AND LIGHTLY SANDED IAW SRM 51-70-04-2R-10 PARAGRAPH 4.F AND H.;[09] PERFORM POST CURE NDI IAW SRM 51-70-04-2R-10 PARAGRAPH 4.G;[10] UT INSPECTED REPAIR AREA PER NDTM PT4 51-00-02; NO DISBONDS NOTED<BR>EQUIP ID ATS2031 DUE 03/2023;[11] REFINISHED REPAIR AREA IAW SRM 51-70-04-2R-10 PARAGRAPH 4.H.;[12] VERIFIED MEASUREMENTS<BR>VERIFIED CORRECTIVE ACTION #11

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