SDR TSAA20211117047

Service difficulty report · Intercostal · Boeing 737330

Difficulty date: November 15, 2021
Submitted: November 18, 2021
Operation: Air carrier
Aircraft: N301KH
Make and model: Boeing 737330
Aircraft serial: 27904
Aircraft time: 49,543 hours, 54,360 cycles
System (JASC): 5300 · Fuselage Structure (General)
Part: Intercostal
Condition: Corroded
Stage of operation: IN
How discovered: O
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 INTERCOSTAL UNDER ANCHOR NUT @ STA 500A+18" BETWEEN STR 25L-26L REMOVED I.A.W. SRM REV 125 CH 51-10-02. NOMINAL THICKNESS: 0.020", REMAINING THICKNESS: 0.011". MATERIAL REMOVAL OF 0.009" IS NOT WITHIN ALLOWABLE LIMITS OF 0.002" I.A.W. B.737-300 SRM REV 125 CH 53-00-04 FIG 101 DETAIL II. REPLACED WITH MADE REPAIR PART FABRICATED AND INSTALLED I.A.W. B.737-300 SRM REV 125 CH 51-30-01 AND 51-40-02. MATERIAL ID I.A.W. B.737-300 SRM REV 125 CH 53-30-04 FIG 1.