Service difficulty report · Intercostal · Boeing 7377H4

Difficulty date
March 30, 2023
Submitted
April 12, 2023
Operation
Air carrier
Aircraft
N956WN
Make and model
Boeing 7377H4
Aircraft serial
36672
Aircraft time
38,869 hours, 23,696 cycles
Part
Intercostal
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 AFT CARGO BAY INTERCOSTAL BS 927-947 LBL 3 W/L 160<[01] UPON FUTHER INVESTIGATION THE PART IS LOCATED BTW B/S 927-947 RBL3 IAW SRM 53-70-53-0I-2 IDENTIFICATION 2;[02] VERIFIED APPLICABILITY FOR ALLOWABLE DAMAGE LIMITS IAW SRM 53-00-53-1A-2 ALLOWABLE DAMAGE 2.<BR>REMOVED CORROSION ON INTERCOSTAL ; L:9' W:1' DEPTH 0.025' IAW SRM 51-10-02 PARAGRAPH 15 .<BR>EVALUATED . ORIGINAL THICKNESS 0.045' REMAINING THICKNESS 0.020' FOUND OUT ALLOWABLE DAMAGE LIMITS IAW SRM 53-00-53-1A-2 ALLOWABLE DAMAGE 2. MUST BE REPLACED;[06] VERIFIED CORRECTIVE ACTION 1-4;[07] LOCATED AND DRILLED NEW INTERCOSTAL BS 927-947 RBL 3 W/L 160; LOT# 1513681-1.<BR>OK TO INSTALL;[08] CORRECTIVE ACTION 7: LOCATED AND DRILLED NEW INTERCOSTAL BS 927-947 RBL 3 W/L 160; LOT# 1513681-1. IAW SRM 51-40-05 AND DWG 147A7500 REV:<BR>OK TO INSTALL;[09] VERIFIED CORRECTIVE ACTION 7;8 AND MEASUREMENT TABLE;[10] INSTALLED NEW INTERCOSTAL BS 927-947 RBL 3 W/L 160; IAW SRM 51-40-02 AND DWG 147A7500 REV:;[11] VERIFIED MEASUREMENTS <BR>VERIFIED CORRECTIVE ACTION #10

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