Service difficulty report · Intercostal · Boeing 7378H4

Difficulty date
July 1, 2024
Submitted
July 29, 2024
Operation
Air carrier
Aircraft
N8697C
Make and model
Boeing 7378H4
Aircraft serial
36728
Aircraft time
26,284 hours, 12,972 cycles
Part
Intercostal
Condition
Corroded
Location
Zone 100
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

FLOOR SUPPORT INTERCOSTAL LOCATED BETWEEN STAS 947-967; RBL 51 HAS CORROSION ON TOP/FWD SURFACE.<[01] REMOVED FLOOR SUPPORT INTERCOSTAL LOCATED BETWEEN STA?S 947-967; RBL 51 PER SRM 51-40-02;[02] REMOVED CORROSION ON FLOOR SUPPORT INTERCOSTAL LOCATED BETWEEN STA?S 947-967; RBL 51. ORIGINAL THICKNESS OF 0.210; MATERIAL REMOVED .009; REMAINING THICKNESS IS 0.201. INTERCOSTAL FOUND TO BE WITHIN LIMITED PER SRM 53-70-51-1A-1.;[03] REMOVED CORROSION ON FLOOR SUPPORT INTERCOSTAL LOCATED BETWEEN STA?S 947-967; RBL 51. ORIGINAL THICKNESS OF 0.201; MATERIAL REMOVED .063; REMAINING THICKNESS IS 0.138. INTERCOSTAL FOUND TO BE OUT OF LIMITED PER SRM 53-70-51-1A-1.;[04] DISREGARD STEP 2;[05] LOCATED AND DRILLED FASTENER HOLES ON NEW INTERCOSTAL PER SRM<BR>51-40-05. EXCEPT FASTENER HOLES ATTACHING TO FLOOR STRUCTURAL 947 AND LAV MOUNT.;[06] REMOVED AND REPLACED INTERCOSTAL PER SRM 51-40-02;[07] INSPECTED AS REQUIRED. CORRECTIVE ACTION #5 AND #6

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