Service difficulty report · Intercostal · Boeing 7377H4

Difficulty date
July 28, 2021
Submitted
September 15, 2021
Operation
Air carrier
Aircraft
N447WN
Make and model
Boeing 7377H4
Aircraft serial
33720
Aircraft time
58,733 hours, 34,620 cycles
Part
Intercostal
Condition
Cracked
Location
Bs 321-328 Lbl45
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

CRACKED INTERCOSTAL AT B.S. 321-328; LBL 45; WL 208.1. ; / [01] REMOVED INTERCOSTAL LOCATED BTW BS.312-328 LBL 45 WL 208.1 IAW SRM 53-00-04-1A-1 ALLOWABLE DAMAGE 1 THE LOCATION OF THE DAMAGED IS NOT CONTEMPLATED IN THE SRM. INTERCOSTAL MUST BE REPAIRED BY REPLACEMENT PER SRM 51-10-02 ITEM 9.C.; [02] RECEIVED INTERCOSTAL WITH P/N 141A5410-12. LOCATED AND DRILLED IAW SRM 51-40-05 DWG#141A5400 OK TO ISTALL.; [03] VERIFIED CORRECTIVE ACTION #2<BR>OK TO ISTALL.; [04] INSTALLED NEW INTERCOSTAL BTW BS312-328 LBL 45; WL 208.1 IAW SRM 51-10-02; SRM 51-40-02; DWG#141A5400. ALL REQUIRE MAINTENANCE ACTIONS ARE COMPLETE REQUEST FINAL BUYOFF.; [05] RII INSPECTED GOOD INSTALLATION OF NEW INTERCOSTAL PER SRM 51-40-02 AND DWG 141A5400.

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