# SDR IPXA2026082195946

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 21, 2026
- Submitted: August 21, 2026
- Operation: Air carrier
- Aircraft: [N463UP](https://openairdocs.org/aircraft/N463UP), registered now
- Make and model: Boeing 757-24APF
- Registry model: [Boeing 757-24APF](https://openairdocs.org/model/boeing-757-24apf) (OpenAirDocs)
- Aircraft serial: 28267
- Aircraft time: 40,306 hours, 21,474 cycles
- System (JASC): [2120 · Air Distribution System](https://openairdocs.org/jasc/2120)
- Part: Unknown
- Condition: Odor
- Location: Cabin
- Stage of operation: DE
- How discovered: O
- Nature of condition: B
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/IPXA2026082195946

## Discrepancy

AT FL 390-410 ACRID BURNING TYPE SMELL COMMING FROM THE PACKS. UNABLE TO DETERMINE WHICH ONE. BACK TO NORMAL ON DESCENT. ACCOMPLISHED  TROUBLSHOOTING IAW FIM REF 21-00-01/301. INSPECTED CABIN RECIRCULATION SYSTEM & ACCOMPLISHED ADJ /TEST OF  CABIN RECIRCULATION FAN IAW 21-25-00/501. NO DEFECTS NOTED. INSPECTED LT & RT PACKS FOR OIL CONTAMINATION IAW AMM 21-00-01/201 NO CONTAMINATION FOUND IN EITHER PACK SYSTEMS. OPS LT & RT PACK SYSTEMS FOR 1 HR EACH IAW MM 21-00-00-862-001. NO ACRID ODOR DETECTED.

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