Service difficulty report · Support Channel · Boeing 7377H4

Difficulty date
June 16, 2022
Submitted
July 25, 2022
Operation
Air carrier
Aircraft
N478WN
Make and model
Boeing 7377H4
Aircraft serial
33989
Aircraft time
60,197 hours, 35,659 cycles
Part
Support Channel
Part number
143A7501183
Condition
Corroded
Location
Fwd Cargo Bay
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

CORROSION. AT FASTENER HOLE FLOOR SUPPORT ZEE CHANNEL S-25L STA 500B FWD CARGO COMPARTMENT MKD DOT / [01] FOUND CRACK AROUND FASTANER HOLE AT FLOOR SUPPORT ZEE CHANNEL S-25 STA 460 FWD CARGO .;[02] ADDING REF ON STEP #1 REF B737-700 SRM 51-10-02-0G-0.;[03] STARTED TO FABRICATE FWD CARGO COMP L/H ZEE CHANNEL AS PER B737-700 SRM 53-00-53-2R-5; FIGURE 202.;[04] FINISHED FABRICATION OF FWD CARGO COMP L/H ZEE CHANNELS FROM STA 390 TO 500D AND SPLICE REPAIR AS PER B737-700 SRM 53-00-53-2R-5; FIGURE 202.;[05] VERIFIED STEPS #1; #2; #3 AND #4.;[06] OK TO TREAT AND PRIME FABRICATED PARTS.;[07] APPLIED ALODINE AND PRIMER AT FWD CARGO COMP L/H ZEE CHANNELS FROM STA 390 TO 500D AND SPLICE REPAIR AS PER B737-700 51-20-01-0G-0; AMM 51-21-72-370-804.;[08] VERIFIED STEP #7.<BR> OK TO INSTALL REPAIR SPLICE.;[09] INSTALLED REPAIR SPLICE ON L/H ZEE CHANNELS AT FWD CARGO COMP TO COMPLETE SECTION FROM STA 390 TO 500D AS PER B737-700 SRM 53-00-53-2R-5; FIGURE 202; INSTALLATION OF ZEE CHANNEL ON THE AIRCRAFT WILL BE ACCOMPLISHED ON CUSTOMER CARD 5330-E-16461-NG;[10] VERIFIED STEP # 9

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