Service difficulty report · Intercostal · Boeing 7378H4

Difficulty date
October 14, 2022
Submitted
November 7, 2022
Operation
Air carrier
Aircraft
N8655D
Make and model
Boeing 7378H4
Aircraft serial
42529
Aircraft time
26,727 hours, 12,442 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

AFT WET AREA INTERCOSTAL LOCATED BETWEEN STA 947.5-967; RBL 50 HAS CORROSION ON UPPER SURFACE AT LAV MOUNT BASE. / [01] BLENDED CORROSION ON MACHINED INTERCOSTAL P/N 147A5660-22 PER SRM 51-10-02. CORROSION REMOVAL FOUND TO BE OUT OF LIMITS PER SRM 53-70-51-1A-1. ORIGINAL THICKNESS = .200?; REMAINING THICKNESS = .174?.;[02] VERIFIED CORROSION REMOVAL FOUND TO BE OUT OF LIMITS PER SRM 53-70-51-1A-1.;[03] REMOVED AND REPLACED INTERCOSTAL BETWEEN STA. 947.5 TO STA. 967 AT RBL 50 PER SRM 51-40-02.;[04] VERIFIED INTERCOSTAL BETWEEN STA. 947.5 TO STA. 967 AT RBL 50 WAS REMOVED AND REPLACED.

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