SDR IPXA2025122272606

Service difficulty report · Computer · Boeing 75724APF

Difficulty date: December 21, 2025
Submitted: December 22, 2025
Operation: Air carrier
Aircraft: N421UP
Make and model: Boeing 75724APF
Aircraft serial: 25281
Aircraft time: 35,673 hours, 23,274 cycles
System (JASC): 3440 · Independent Position Determining System
Part: Computer
Part number: 9650976003239239
Part serial: 2001
Condition: Faulted
Stage of operation: CL
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

AIR TURN BACK, DURING CLIMB OUT THROUGH 14,000Â€™ OBSERVED THREE SIMULTANEOUS ADVISORY MESSAGES RESULTED IN DIVERSION/RETURN SDF. "GRND PRX SYST" "TERR SYST" "WINDSHEAR SYST". ++REPLACED EGPWS COMPUTER PER AMM 34-46-01-404-005. VERIFIED SOFTWARE PER AMM SOFTWARE MATRIX PER AMM 34-21-00/201. OPS CHECK GOOD.

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