Service difficulty report · Vapor Barrier · Boeing

Difficulty date
September 13, 2021
Submitted
October 13, 2021
Operation
Air carrier
Aircraft
N7843A
Make and model
Boeing
Aircraft serial
35786
Aircraft time
47,875 hours, 24,909 cycles
Part
Vapor Barrier
Condition
Cracked
Location
Center Wing
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

RIGHT HAND VAPOR BARRIER IS CRACKED AT B.S. 663; R.B.L. 32; W.L. 154. ; / [01] PART/MATERIAL IDENTIFIED PER SRM 57-10-10-0I-2 FIG 2 TABLE 2 ITEM 4.<BR>16' VERTICAL CRACK EXCEEDS ALLOWABLE DAMAGE LIMITS AS GIVEN IN SRM 57-10-10-1A-2 PARA 4 D (1) ADDITIONAL CRACK FOUND AT FASTENER HOLE AT RBL 64 1' .<BR>BOTH CRACK REPAIRS TO BE PERFORMED IAW SRM 51-70-04 REPAIR 10 AS GIVEN IN SRM 57-10-10-2R-2; [02] VALIDATED REPAIR PER SRM 51-70-04 REPAIR 10; [03] PERFORMED DAMAGE REMOVAL & SURFACE PREPARATION STEPS AS GIVEN IN SRM 51-70-04-2R-10 PARA 4 STEPS A-C . <BR><BR>USING BMS 9-3 STYLE 1581 GLASS LOT 1458851-1 & BMS8-301/9390 LOT JH1CAA0868 FABRICATED REPAIR PLIES IAW SRM 51-70-04-2R-10 PARA 4 STEP C OK TO LAY UP; [04] VERIFIED DAMAGE REMOVAL AND SURFACE PREPARATION PER SRM 51-70-04-2R-10; OK TO LAY UP; [05] PRIOR TO OK TO LAY-UP; VERIFIED FABRICATION OF REPAIR PLIES PER SRM 51-70-04-2R-10; PARA 4 STEP C; [06] LAID UP THE REPAIRS ;VACUUM BAGGED ;LEAK CHECKED THEN SET TO CURE IAW SRM 51-70-04-2R-10 PARA 4 STEPS D & E; [07] CURED THE REPAIRS IAW SRM 51-70-04-2R-10 PARA 4 STEPS E & F REF CAL TOOL HOT BONDER ID ATS532 SN 15092117; [08] VERIFIED CORRECTIVE ACTIONS 6 AND 7; [09] UT INSPECTED POST CURE IAW 737 NDTM PART 4 51-00-02; NO DISBONDS NOTED. EQUIP ID#: ATS2341 S/N: 190848104; [10] APPLIED SURFACE FINISH AS GIVEN IN SRM 51-70-04-2R-10 PARA 4 STEP H; [11] VERIFIED ALL STEPS COMPLETED; [12] VERIFIED APPLIED SURFACE FINISH AS GIVEN IN SRM 51-70-04-2R-10 PARA 4 STEP H.