SDR IPXA2025111323417

Service difficulty report · Duct · Boeing 75724APF

Difficulty date: November 11, 2025
Submitted: November 13, 2025
Operation: Air carrier
Aircraft: N402UP
Make and model: Boeing 75724APF
Aircraft serial: 23724
Aircraft time: 38,990 hours, 26,689 cycles
System (JASC): 7500 · Engine Bleed Air System
Part: Duct
Condition: Leaking
Location: Bleed Air System
Stage of operation: TX
How discovered: O
Nature of condition: O
Precautionary procedure: O

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

DURING LEFT ENGINE START, LEFT BLEED DUCT BLEED LEAK. ABORTED ENGINE START, RAN CHECKLIST SMOKE VISIBLE COCKPIT ON GROUND. RESULTED IN BTB. REPLACED 2 DAMAGED DUCTS IN AFT LOWER CARGO PIT REF M/M 36-11-01. PRESSURIZED DUCTS NO LEAKS NOTED.

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