Service difficulty report · Channel · Boeing 7377H4

Difficulty date
October 20, 2022
Submitted
November 15, 2022
Operation
Air carrier
Aircraft
N207WN
Make and model
Boeing 7377H4
Aircraft serial
34012
Aircraft time
56,256 hours, 33,707 cycles
Part
Channel
Condition
Corroded
Location
Bs 492-500
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 FOUND FWD CARGO R/H 'Z' CHANNEL FROM STA 492.4 THRU STA 500 / [01] REMOVED CORROSION AT FWD CARGO COMP. R/H 'Z' CHANNEL (SHIELD) BETW. STA 492.4 THRU STA 500 PER B737-700 SRM 51-10-02-0G-0.;[02] PERFORMED UT THICKNESS INSP ON REWORKED AREA IAW B737 NDT P4 51-00-00 PROC.3 ; MIN THK. NOTED 0.020' <BR>TOOL USED : OLYMPUS 27MG B/C 172139 04/23;[03] AFTER REMOVED CORROSION AT FWD CARGO COMP. R/H 'Z' CHANNEL (SHIELD) BETW. STA 492.4 THRU STA 500 RBL 25 FOUND OUT LIMITS PER B737-700 SRM 53-00-53-1A-2. ORIG.MATEERIAL = 0.032'; MAT. REMOVED = 0.012' MATERIAL REMAINING = 0.020';[04] LOCATED AND DRILLED NEW R/H SIDE 'Z' CHANNEL (SHIELD) BETW. STA 492.4 THRU STA 500 PER B737-700 SRM 51-10-02-0G-0;[05] 'LATE ENTRY' REMOVED R/H 'Z' CHANNEL (SHIELD) AT FWD CARGO COMP; BTW. STA 492.4 THRU STA 500 PER B737-700 SRM 51-40-02-0G-0;[06] VERIFIED STEPS 1; 3; 4 AND 5. OK TO APPLY PRIMER.;[07] TREATED AND PRIMED NEW HOLES PER B737-700 SRM 51-20-01-0G-0 AND AMM 51-21-72-370-804.;[08] VERIFIED TREATMENT APPLICATION.<BR>OK TO APPLY TOPCOAT.;[09] APPLIED TOP COAT (WHITE) ON NEW Z CHANNEL (SHIELD) PER B737-700 AMM 51-21-73-370-804.;[10] VERIFIED TOPCOAT APPLICATION.<BR>OK TO INSTALL Z CHANNEL.;[11] INSTALLED FWD CARGO COMP. DOOR AFT SHIELD BETW. STA 492.4 THRU 500 PER B737-700 SRM 51-40-02-0G-0 AND DRAWINF 143A8126;[12] CERTIFIED;[13] VERIFIED STEP #11 AND #12; Z CHANNEL (SHIELD) INSTALLATION.

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