Service difficulty report · Intercostal · Boeing 7377H4

Difficulty date
May 12, 2023
Submitted
June 20, 2023
Operation
Air carrier
Aircraft
N429WN
Make and model
Boeing 7377H4
Aircraft serial
33658
Aircraft time
66,602 hours, 39,316 cycles
Part
Intercostal
Part number
UNKNOWN
Condition
Corroded
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

CORROSION ON INTERCOSTAL AT ACB BS867+2 LBL10 WL162.<[01] CORROSION ON INTERCOSTAL AT AFT CARGO BAY; LOCATED BETWEEN BS.867+2' - LBL10; WL.162 FOUND TO BE OUT OF LIMIT DUE TO NOT HAS ENTRIES ALLOWABLE DAMAGE IN SRM; PART WILL BE REPAIRED BY REPLACEMENT IAW SRM 51-10-02-0G-0 PAR-9. C.;[02] REMOVED INTERCOSTAL AT AFT CARGO BAY; LOCATED BETWEEN BS 867+2 LBL 10; WL.162 IAW SRM 51-40-02-0G-0.;[03] RECIEVED NEW/SERVICABLE INTERCOSTAL FORMED OUT OF 7075 T0 .050' CLAD LOT #1526802-1 PER DRAWING #146A9403(-142) AND HEAT TREATED TO T62 CONDITION PER BAC5602 AS REQUIRED PER CUSTOMER RO #920983; JOB #560152.;[04] VERIFIED CORRECTION ACTION ITEM 3.;[05] LOCATED AND DRILLED NEW AFT CARGO BAY INTERCOSTAL BS 867 TO BS 887 LBL 10 IAW SRM 51-40-05-0G-0 AND DWG#146A7943 AND APPLIED CHEMICAL CONVERSION COATING IAW SREM 51-20-01-0G-0 OK TO PRIME;[06] VERIFIED CORRECTIVE ACTION #5. <BR>VERIFIED OK TO PRIME.;[07] PRIMED NEW INTERCOSTAL IAW SRM 51-20-01-0G-0 OK TO INSTALL;[08] VERIFIED CORRECTIVE ACTION #7.<BR>VERIFIED OK TO INSTALL NEW INTERCOSTAL.;[09] INSTALLED NEW AFT CARGO BAY INTERCOSTAL BS 867 TO BS 887 LBL 10 IAW SRM 51-40-02 AND DWG 146A7943.;[10] VERIFIED CORRECTIVE ACTION 9;[11] VERIFIED MEASUREMENT TABLE

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