SDR IPXA2026013056128

Service difficulty report · Longeron · 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
System (JASC): 4910 · APU Cowling/Containment
Part: Longeron
Part number: 148N82018
Condition: Corroded
Location: Zone 100
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

APU BAY, INTERNAL STRUCTURE RT LONGERON, BS 1885.2 CORRODED. REMOVED CORROSION ON THE RT APU LONGERON, ORIGINAL THICKNESS 0.050", MATERIAL REMOVED 0.008". INSTALLED NEW LONGERON, SERVICABLE SEAL RETAINER, SERVICABLE SUPPORT PLATES, SERVICABLE HINGE ASSY, SERVICABLE FRAME, SERVICABLE STIFFENERS, SERVICABLE GUSSET ASSEMBLIES, AND SERVICABLE CHANNEL ASSEMBLIES IAW SRM 51-40-02-OG.

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