Service difficulty report · Bulkhead · Boeing 7377H4

Difficulty date
March 8, 2023
Submitted
April 18, 2023
Operation
Air carrier
Aircraft
N281WN
Make and model
Boeing 7377H4
Aircraft serial
36528
Aircraft time
51,516 hours, 31,045 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

POSSIBLE CRACK AT LOWER R/H COMPOSITE BULKHEAD AT BS663 RBL34 WL156<[01] PART/MATERIAL IDENTIFIED PER SRM 57-10-10-0I-2 FIGURE 2 TABLE 2 ITEM 4 <BR>CRACK MIGRATION INTO PREVIOUS REPAIR EXCEEDS THE ALLOWABLE LIMITS AS GIVEN IN SRM 57-10-10-1A-2 PARA 4. D. (1).<BR>REPAIR TO BE PERFORMED IAW SRM 51-70-04-2R-10 AS GIVEN IN SRM 57-10-10-2R-2 PARA 1. C. NOTE:;[02] PERFORMED DAMAGE REMOVAL & SURFACE PREPARATION STEPS IAW SRM 51-70-04-2R-10 PARA 4. STEPS A-C.;[03] VALIDATED REPAIR PER SRM 51-70-04-2R-10;[04] VERIFIED CORRECTIVE ACTIONS 1-3<BR><BR>VERIFIED MEASUREMENTS TABLE<BR><BR>VALIDATED REPAIR PER SRM 51-70-04-2R-10;[05] USING BMS9-3 STYLE 1581 GLASS LOT 1520142 & BMS8-301 CLASS 1/EA9390 RESIN LOT JH2EAA8895. FABRICATED THE REPAIR PLIES & PREPARED THE DAMAGED AREA FOR LAYUP IAW SRM 51-70-04-2R-10 PARA 4. STEPS C & D. <BR>OK TO LAY UP FORWARD SIDE PLIES.;[06] VERIFIED CORRECTIVE ACTION 5 <BR><BR>OK TO INSTALL FWD SIDE REPAIR PLIES;[07] LAID UP THE FORWARD SIDE REPAIR PLIES. VACUUM BAGGED. LEAK CHECKED REF CAL TOOL HOT BONDER NCX000523 CAL DUE 06/2023 THEN SET TO CURE IAW SRM 51-70-04-2R-10 PARA 4. E. FIGURE 214 PAGE 39.;[08] VERIFIED CORRECTIVE ACTION 7;[09] FORWARD SIDE REPAIR PLIES CURED IAW SRM 51-70-04-2R-10 PARA 4. G. REF CAL TOOL HOT BONDER ID NCX000523 CAL DUE 06/2023.<BR>AFT SIDE REPAIR PLIES FABRICATED IN CORRECTIVE ACTION 5. OK TO INSTALL AFT SIDE REPAIR PER SRM 51-70-04-2R-10 PARA 4.D.

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