Service difficulty report · Intercostal · Boeing 7377H4

Difficulty date
July 4, 2023
Submitted
August 9, 2023
Operation
Air carrier
Aircraft
N965WN
Make and model
Boeing 7377H4
Aircraft serial
36677
Aircraft time
38,362 hours, 23,630 cycles
Part
Intercostal
Part number
UNKNOWN
Condition
Cracked
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

CRACKED INTERCOSTAL IN UPPER AFT RADIUS BS 947 RBL 17 WL 179<[01] VERIFIED APPLICABILITY OF SRM 53-70-53-01-2 IDENTIFICATION 2 - SECTION 47 AND SRM 53-00-53-1A-2 ALLOWABLE DAMAGE 2.;[02] VERIFIED ITEM 1 CORRECTIVE ACTIONS.;[03] MEASURED CRACK ON INTERCOSTAL IS 1;100' AND IS FOUND OUT OF LIMITS IAW SRM 53-00-53-1A-2 ALLOWABLE DAMAGE 2; FIG. 103.<BR>REMOVED ACB INTERCOSTAL FROM BS 727 TO BS 747; RBL 17 IAW SRM 51-40-02-0G-0.<BR>UPDATED MEASUREMENT TABLE.;[04] VERIFIED OUT OF LIMITS.;[05] VERIFIED ITEM 1 CORRECTIVE ACTIONS.;[06] VERIFIED ITEM 3 CORRECTIVE ACTIONS.;[07] LOCATED AND DRILLED NEW INTERCOSTAL P/N 147A7500-22 IAW SRM 51-40-05-0G-0; AN DWG. # 147A7500; REV. -.;[08] REQ. OK TO INSTALL NEW INTERCOSTAL.;[09] VERIFIED CORRECTIVE ACTION 7. <BR>OK TO INSTALL;[10] OK TO TREAT AND PRIME;[11] ENTERED IN ERROR;[12] INSTALLED NEW INTERCOSTAL P/N 147A7500-22 IAW SRM 51-40-02-0G-0; AND DWG. # 147A7500; REV. -.;[13] VERIFIED CORRECTIVE ACTION 12;[14] VERIFIED MEASUREMENT TABLE

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