Service difficulty report · Intercostal · Boeing 75724APF

Difficulty date
January 11, 2026
Submitted
February 2, 2026
Operation
Air carrier
Aircraft
N411UP
Make and model
Boeing 75724APF
Aircraft serial
23851
Aircraft time
39,473 hours, 26,446 cycles
Part
Intercostal
Part number
652533512
Condition
Cracked
Location
Zone 800
Stage of operation
IN
How discovered
V
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

MDC DOOR INTERNAL STRUCTURE, AN INTERCOSTAL FOUND CRACKED AT FWD LWR SECTION. REMOVED THE INTERCOSTAL IAW SRM 51-40-02-0G-0, AFTER EVALUATION FOUND CRACK TO BE OUT OF LIMITS, FLANGE 1.095", LENGTH 0.940", IAW 52-30-02-1A-1, DETAIL II, NOTE B. INSTALLED NEW INTERCOSTAL SPLICE IAW SRM 51-40-02-0G-0, APPLIED TORQUE IN BOLTS IAW AMM 20-11-00-912-001, TABLE 203.

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