Service difficulty report · Intercostal · Boeing 7377H4

Difficulty date
May 16, 2023
Submitted
June 21, 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
Cracked
Location
Zn 200 Fus Top
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

INTERCOSTAL CRACKED AT BS 259.5; WL 207; LBL 5<[01] RECIVED FABRICATED INTERCOSTAL FROM OSS LOT # 1528128-1 CUSTOMER RO NO 920188-SWA; AND LOCATED AND DRILLED NEW PART IAW SRM 51-40-05-0G-0 DGW 141A5100; APPLIED CHEMICAL CONVERSION COATING IAW SRM 51-20-01-0G-0 OK TO PRIMER;[02] VERIFIED CORRECTIVE ACTION ITEM 1.<BR>OKAY TO PRIME AND PART MARK NEW INTERCOSTAL.;[03] APPLIED PRIMER ON NEW INTERCOSTAL IAW AMM 51-21-72-370-804.<BR>OK TO INSTALL.;[04] REJECTION OF CORRECTIVE ACTION 3: NEW INTERCOSTAL HAS AREAS OF MISSING PRIMER. SEE STEP 1;[05] PARTIAL STEP 1;[06] VERIFIED STEP 1 AND CORRECTIVE ACTION 3. OK TO INSTALL.;[07] INSTALLED NEW INTERCOSTAL AT STA-259.5 LBL-15.332 TO LBL-3.6 WL 207.540 IAW SRM 51-40-02-0G-0 AND DWG:141A5100.<BR>REFER TO EA-23-153-01625-WIP1 STEP 4 CUSTOMER CARD: TTG8Q00L55TN.;[08] VERIFIED CORRECTIVE ACTION 7;[09] UPDATE ITEM 2: ACCOMPLISHED PART MARKING ON NEW STIFFENER IAW EA-23-153-01625-WIP1 STEP 3.;[10] VERIFIED STEP 2 AND CORRECTIVE ACTION 9;[11] INTERCOSTAL CRACKED AT BS 259.5; WL 207; LBL 5 WAS REPAIRED IAW EA 23-153-01625;[12] VERIFIED MEASUREMENTS.

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