Service difficulty report · Doubler · Boeing 7377H4

Difficulty date
July 14, 2021
Submitted
August 2, 2021
Operation
Air carrier
Aircraft
N962WN
Make and model
Boeing 7377H4
Aircraft serial
36963
Aircraft time
33,006 hours, 20,057 cycles
Part
Doubler
Condition
Cracked
Location
Bs 663 Bulkhead
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

BS 663 VAPOR BARRIER DBLR IS CRACKED LBL 24 W/L 148 P/N 111A1151-27 ; / [01] FORMED NEW BS 663 VAPOR BARRIER DOUBLER FROM 2024TO 0.040' CLAD SHEET LOT# 1430186-1; PER DWG 111A1511 SH25.; [02] VERIFIED FORMED NEW BS 663 VAPOR BARRIER DOUBLER FROM 2024TO 0.040' CLAD SHEET LOT# 1430186-1; PER DWG 111A1511 SH25.; [03] RECEIVED NEW B /S 663 VAPOR BARRIER DOUBLER LOT# 1463635-1 PO# 830587-1; HEAT TREATED AND DYE PEN INSPECTED ON CUSTOMER RO NO 830587-SWA; [04] LOCATED AND DRILLED NEW B/S 663 VAPOR BARRIER DOUBLER IAW SRM 51-40-05 AND DWG 111A1001 REV:; [05] VERIFIED; [06] VERIFIED LOCATING AND DRILL UP OF NEW B/S 663 VAPOR BARRIER DOUBLER IAW SRM 51-40-05 AND DWG 111A1001 REV:-; [07] APPLIED CHEMICAL CONVERSION COATING AND PRIMER ON NEW B/S 663 VAPOR BARRIER DOUBLER IAW SRM 51-20-01 AND AMM 51-21-72-370-804; [08] OK TO INSTALL; [09] VERIFIED; [10] VERIFIED APPLICATION OF CHEMICAL CONVERSION COATING AND PRIMER ON NEW B/S 663 VAPOR BARRIER DOUBLER IAW SRM 51-20-01 AND AMM 51-21-72-370-804. OK TO INSTALL DOUBLER GIVEN.; [11] UPON FURTHER INVESTIGATION DOUBLER AT BS663 LBL24 WL148 PN IS 111A1511-27. REF DWG 111A1001 REV:-; [12] INSTALLED A NEW DOUBLER PN 111A1511-27 AT BS663 LBL24 WL148 IAW SRM 51-40-02; DWG 111A1000 REV:-; DWG 144A7100 REV:-; [13] RII INSPECTED INSTALLED A NEW DOUBLER PN 111A1511-27 AT BS663 LBL24 WL148 IAW SRM 51-40-02; DWG 111A1000 REV:-; DWG 144A7100 REV:-; [14] FINAL INSPECTION COMPLETE

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