Service difficulty report · Pressure Deck · Boeing 7377H4

Difficulty date
June 4, 2021
Submitted
July 15, 2021
Operation
Air carrier
Aircraft
N489WN
Make and model
Boeing 7377H4
Aircraft serial
33855
Aircraft time
54,253 hours, 32,244 cycles
Part
Pressure Deck
Condition
Cracked
Location
Fuselage
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

CRACK IN HORIZONTAL PRESSURE DECK BS 665; LBL39 WL 202. MARKED IN RED INK. / [01] INSTALLED E.W.I.S PROTECTION ON REPAIR AREA I.A.W AMM 20-60-07; [02] NO ALLOWABLE DAMAGE FOUND ON SRM FOR CRACK;REMOVED DAMAGE ON HORIZONTAL PRESSURE DECK BS663-BS675 LBL30-LBL60 WL202 I.A.W SRM 51-10-02-0G-0; [04] VERIFIED DAMAGE REMOVAL AND APPLICABILITY PER SRM.; [05] HFEC TRIM OUT IAW 737 NDTM PART 6 51-00-00 PROCEDURE 23; NO CRACKS NOTED.[06] HFEC INSP OPEN HOLES IN REPAIR AREA IAW 737 NDTM PART 6 51-00-00 PROCEDURE 16; NO CRACKS NOTED.[09] FABRICATED REPAIR PARTS ITEM(1)DOUBLER(1EA);ITEM(4)FILLER(1EA);ITEM(7)FILLER(1EA) FROM 2024-T3 0.080'LOT #1447577-1;ITEM(2)STIFFENER(7EA)FROMBAC1505-100052 7075-T6 LOT#1447789-1;ITEM(3)WEB(1EA);ITEM(8)FILLER(1EA);ITEM(9)FILLER(1EA)FROM2024-T3 0.063'LOT#1457316-1;ITEM(5)FILLER(3EA)FROM 7075-T6 0.020' LOT#1381332-1;ITEM(6)FILLER(3EA)FROM 7075-T6 0.071'LOT#1459410-1 AND ITEM(6)FILLER(3EA)FROM 7075-T6 0.040' LOT #1449280-1;LOCATED;DRILLED NEW AND EXISTING FASTENER HOLES DEBURRED ;FLAP PEENING PART(2)STIFFENER AT LBL34 AND LBL42 ALL FABRICATION I.A.W SRM 53-40-51-2R-2 REPAIR 2 PAR 4.E-4.I TABLE 202 FIG 203; [10] APPLIED CHEMICAL CONVERSION COAT TO THE REPAIR PARTS AND TO THE BARE SURFACES OF THE INITIAL PARTS ALL I.A.W SRM 53-40-51-2R-2 REPAIR 2 PAR 4.J;18] REMOVED AND REPAIRED DAMAGE PART OF THE BS663-BS675 LBL25-LBL60 WL202 PER SRM 53-40-51-2R-2 PAR 1.A(2) FIG 203/REPAIR 2;

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