SDR IPXA2025071179209

Service difficulty report · Stringer · Boeing 75724APF

Difficulty date: July 5, 2025
Submitted: July 28, 2025
Operation: Air carrier
Aircraft: N407UP
Make and model: Boeing 75724APF
Aircraft serial: 23729
Aircraft time: 38,062 hours, 25,464 cycles
System (JASC): 5313 · Fuselage Main, Longeron/Stringer
Part: Stringer
Part number: 146N3110190
Condition: Corroded
Location: Zone
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

MAJOR REPAIR, LOWER AFT FUSELAGE, BS 1460 HAS EXFOLIATION CORROSION BETWEEN SKIN INNER AREA AND STRINGERS 29 AND 30. INSTALLED STRINGER 23 CLIPS. INSTALLED 2 SUPPORT CHANNELS. INSTALLED 8 FLOOR SUPPORT BRACKETS. INSTALLED 6 STRINGER SPLICES. INSTALLED ONE ANTENNA SUPPORT CLIP. INSTALLED ONE ANGLE SUPPORT IAW SRM 51-40-02-0G

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