Service difficulty report · Intercostal · Boeing 73776N

Difficulty date
December 29, 2022
Submitted
January 27, 2023
Operation
Air carrier
Aircraft
N7812G
Make and model
Boeing 73776N
Aircraft serial
32582
Aircraft time
56,870 hours, 33,864 cycles
Part
Intercostal
Condition
Corroded
Location
Zone 100
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 ON INTERCOSTAL AT AFT CARGO BAY BS807+13 RBL6.<[01] EVALUATED CORROSION AT ALL LOCATIONS; FOUND DEEPEST LOCATION TO BE AT BS 807+13' REMOVED 0.0006' IN AN AREA OF 1'X1' ORIGINAL THICKNESS 0.036' FOUND TO BE OUT OF LIMITS PER SRM 53-00-04-1A-1 USING ATS TOOL ID ATS2678 EXP 4/2023;[02] REMOVED INTERCOSTAL PER SRM 51-40-02;[03] VERIFIED CORRECTIVE ACTION 1 AND MEASUREMENT TABLE.;[04] RECEIVED INTERCOSTAL BS 807 TO BS 827 RBL 6 FROM OSS; CUSTOMER RO# 899581-SWA; MATERIAL USED 7075 T0 .063' CLAD LOT# 1392320-1;[05] LOCATED AND DRILLED NEW INTERCOSTAL BS 807 TO BS 827 RBL 6 PER SRM 51-40-05-0G-0 AND DWG 146A8130. OK TO APPLY CHEMICAL CONVERSION COATING AND PRIMER;[06] VERIFIED CORRECTIVE ACTIONS 4 AND 5.;[07] APPLIED CHEMICAL CONVERSION COATING AND PRIMER ON INTERCOSTAL BS 807 TO BS 827 RBL 6 PER SRM 51-20-01 AND SOPM 20-41-02.;[08] OK TO INSTALL INTERCOSTAL;[09] VERIFIED CORRECTIVE ACTION 8.;[10] INSTALLED INTERCOSTAL AT BS 807 TO BS 827 RBL 6 PER SRM 51-40-02-0G-0 AND DWG 146A8130;[11] VERIFIED CORRECTIVE ACTION 10 AND MEASUREMENT TABLE.

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