Service difficulty report · Doubler · Boeing 7377H4

Difficulty date
February 15, 2023
Submitted
February 24, 2023
Operation
Air carrier
Aircraft
N408WN
Make and model
Boeing 7377H4
Aircraft serial
27895
Aircraft time
71,794 hours, 42,650 cycles
Part
Doubler
Condition
Out Of Tolerance
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

UPON REMOVAL OF EGPR INTERNAL SURROUND DOUBLER; FOUND EXISTING EXTERNAL DOUBLER AND TRIPLER WITH DEEP COUNTERSINKS.<[01] PARTIALLY: STARTED FABRICATION OF THE EXTERNAL DOUBLER OF EGPR MATERIAL USED 2024T3 .063 IN AS PER SRM 53-10-15-2R-5 FIG 202 SHEET 1;[02] FABRICATED TRIPLER AND DOUBLE AND LOCATED AND DRILLED ;AND COUNTERSINK AT EGPR INTERNAL SURROUND DOUBLER AS PER B/737 SRM51-40-05-0G-0 AND SRM 51-40-08-OG-0 AND SRM 53-10-15-2R-5 REPAIR 5.MATERIAL USED 2024 T3 0.063 PO #1049248.;[03] VERIFIED STEPS 1 AND 2. OK TO TREAT AND PRIME FABRICATED TRIPLER AND DOUBLE.;[04] TREATED AND PRIMED TRIPLER AND DOUBLER AND FILER AT EGPR INTERNAL SURROUND DOUBLER AS PER REF B/737 AMM 51-21-41-370-803 AND AMM 51-21-72-370-803.[08] INSTALLED FILLER WASHERS AT EXTERNAL POWER DOUBLER AS PER B 737 SRM 53-10-15-2R-5 FIG 202 SHEET 1;[09] VALIDATED STEP 8<BR><BR><BR>OK TO INSTALL REPAIR;[10] TRIPLER AND DOUBLE TO BE INSTALLED ON ITEM TTG8Q00HUQ7A AS PER B 737 SRM 53-10-15-2R-5 REPAIR 5.;[11] VALIDATED STEP 10

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