Service difficulty report · Panel · Boeing 7377H4

Difficulty date
March 28, 2023
Submitted
April 25, 2023
Operation
Air carrier
Aircraft
N957WN
Make and model
Boeing 7377H4
Aircraft serial
41528
Aircraft time
38,518 hours, 23,626 cycles
Part
Panel
Condition
Delaminated
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 193AR HAS A DELAMINATION ON THE INNER SURFACE SKIN 19.5' FROM THE I/B END; 7' FROM FWD EDGE<DAMAGE IS OUT OF ALLOWABLE DAMAGE LIMITS IAW SRM 53-40-70-1A-1 TABLE 101; PARA 4.A(5DISBOND NOTED; REMOVED 2' DIA OF INNER SKIN AND PARTIAL DEPTH CORE; DISBOND NOTED; REMOVED 2' DIA OF INNER SKIN AND PARTIAL DEPTH CORE; POTTED CORE USING BMS 5-28 TY7 LOT# AK1AP8072K IAW SRM 51-70-05-2R-11 PARA 4.A POTTING REQUIRES CURE; CURED POTTING AT ROOM TEMP AND SANDED SMOOTH WITH INITIAL SURFACE IAW SRM 51-70-05-2R-11 PARA 4B-CDAMAGE IS OUT OF ALLOWABLE DAMAGE LIMITS IAW SRM 53-40-70-1A-1 TABLE 101; PARA 4.A(5).REMOVED DAMAGE TO 2' DIA TO SKIN AND CORE;.REMOVED 1' DIA OF INNER SURFACE SKIN AND PARTIAL DEPTH CORE; CLEANED REPAIR AREA IAW SRM 51-70-05-2R-2 PARA 4.A-B; POTTED 2' (STEP 6) AND 1' (STEP 10) REPAIR AREAS WITH BMS 5-28 TY7 POTTING (CG1305) LOT AK1AP8072K; CURED POTTING; SANDED POTTING TO CONTOUR AND CLEANED ALL REPAIR AREAS IAW SRM 51-70-05-2R-2 PARA 4.D 'NOTE' AND SRM 51-70-05-2R-11 PARA 4.A-D FABRICATED REPAIR PLIES FOR ALL AREAS FROM BMS 8-79 LOT 1521550-2 AND BMS 5-129 LOT 1521552-3; VACUUM BAGGED AND SET FOR CURE IAW SRM 51-70-05-2R-11 PARA 4.B-D AND SRM 51-70-05-2R-2 PARA 4.F-ICOMPLETED CURE; UNBAGGED AND LIGHTLY SANDED REPAIRS IAW SRM 51-70-05-2R-2 PARA 4.I; K.;REPAIRED DELAMINATION ON INNER SURFACE SKIN 19.5' FROM I/B END; 7' FROM FWD EDGE ON PANEL 193AR IAW SRM 51-70-05-2R-2 AND SRM 51-70-05-2R-11

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